Prepare Release 2024.11.20

merge development into master

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -4,19 +4,19 @@ labels: ["bug"]
 body:
   - type: markdown
     attributes:
-      value: >
+      value: |
-        ### ⚠️ Please remember: issues are for *bugs*
+        ### ⚠️ Please remember: issues are for *bugs*⚠️
-        That is, something you believe affects every single user of OpenDTU, not just you. If you're not sure, start with one of the other options below.
+        That is, something you believe affects every single user of OpenDTU-OnBattery, not just you. If you're not sure, start with one of the other options below.
   - type: markdown
     attributes:
       value: |
-        #### Have a question? 👉 [Start a new discussion](https://github.com/tbnobody/OpenDTU/discussions/new) or [ask in chat](https://discord.gg/WzhxEY62mB).
+        #### Have a question? 👉 [Start a new discussion](https://github.com/helgeerbe/OpenDTU-OnBattery/discussions/new/choose) or [ask in chat](https://discord.gg/WzhxEY62mB).
 
         #### Before opening an issue, please double check:
 
-        - [Documentation](https://www.opendtu.solar).
+        - [Documentation](https://opendtu-onbattery.net)
-        - [The FAQs](https://www.opendtu.solar/firmware/faq/).
+        - [The FAQs](https://opendtu-onbattery.net/firmware/faq/)
-        - [Existing issues and discussions](https://github.com/tbnobody/OpenDTU/search?q=&type=issues).
+        - [Existing issues and discussions](https://github.com/helgeerbe/OpenDTU-OnBattery/search?q=&type=issues)
   - type: textarea
     id: what-happened
     attributes:
@@ -45,7 +45,7 @@ body:
     id: install_format
     attributes:
       label: Install Method
-      description: How did you install OpenDTU?
+      description: How did you install OpenDTU-OnBattery?
       options:
         - Pre-Compiled binary from GitHub releases
         - Pre-Compiled binary from GitHub actions/pull-request
@@ -55,17 +55,25 @@ body:
   - type: input
     id: version
     attributes:
-      label: What git-hash/version of OpenDTU?
+      label: What git-hash/version of OpenDTU-OnBattery?
-      description: You can find this in by going to Info -> System
+      description: You can find this in the Web UI at Info -> System.
       placeholder: "e.g. 359d513"
     validations:
       required: true
-  - type: input
+  - type: dropdown
     id: environment
     attributes:
-      label: What firmware variant (PIO Environment) are you using?
+      label: What firmware variant (PIO Environment)?
-      description: You can find this in by going to Info -> System
+      description: You can find this in the Web UI at Info -> System.
-      placeholder: "generic_esp32s3_usb"
+      options:
+          - "generic_esp32s3_usb"
+          - "generic_esp32s3"
+          - "generic_esp32_8mb"
+          - "generic_esp32_4mb_no_ota"
+          - "generic_esp32"
+          - "generic"
+          - "opendtufusionv2"
+          - "other (tell us in 'Anything else?')"
     validations:
       required: true
   - type: textarea
@@ -87,7 +95,7 @@ body:
     attributes:
       label: Please confirm the following
       options:
-        - label: I believe this issue is a bug that affects all users of OpenDTU, not something specific to my installation.
+        - label: I believe this issue is a bug that affects all users of OpenDTU-OnBattery, not something specific to my installation.
           required: true
         - label: I have already searched for relevant existing issues and discussions before opening this report.
           required: true

.github/ISSUE_TEMPLATE/config.yml

@@ -4,5 +4,5 @@ contact_links:
     url: https://discord.gg/WzhxEY62mB
     about: Discuss with us on Discord
   - name: 🤔 Have questions or need support?
-    url: https://github.com/tbnobody/OpenDTU/discussions
+    url: https://github.com/helgeerbe/OpenDTU-OnBattery/discussions
     about: Use the GitHub Discussions feature

.github/ISSUE_TEMPLATE/feature_request.yml

@@ -1,12 +1,12 @@
 name: ✨ Request a feature
-description: Suggest an improvement idea for OpenDTU!
+description: Suggest an improvement idea for OpenDTU-OnBattery!
 title: "[Request]"
 labels: ["enhancement"]
 body:
   - type: markdown
     attributes:
       value: >
-        **Thank you for wanting to request a feature in OpenDTU!**
+        **Thank you for wanting to request a feature in OpenDTU-OnBattery!**
 
         Before you go ahead with your request, please first consider if it wouldn't be
         better suited in a external home automation software like OpenHAB, ioBroker, Home Assistant etc.

.github/workflows/build.yml

@@ -1,10 +1,15 @@
-name: OpenDTU Build
+name: OpenDTU-OnBattery Build
 
 on:
   push:
     paths-ignore:
       - docs/**
       - '**/*.md'
+    branches:
+      - master
+      - development
+    tags-ignore:
+      - 'v**'
   pull_request:
     paths-ignore:
       - docs/**
@@ -55,6 +60,15 @@ jobs:
       - name: Get tags
         run: git fetch --force --tags origin
 
+      - name: Create and switch to a meaningful branch for pull-requests
+        if: github.event_name == 'pull_request'
+        run: |
+          OWNER=${{ github.repository_owner }}
+          NAME=${{ github.event.repository.name }}
+          ID=${{ github.event.pull_request.number }}
+          DATE=$(date +'%Y%m%d%H%M')
+          git switch -c ${OWNER}/${NAME}/pr${ID}-${DATE}
+
       - name: Cache pip
         uses: actions/cache@v4
         with:
@@ -105,27 +119,48 @@ jobs:
         run: pio run -e ${{ matrix.environment }}
 
       - name: Rename Firmware
-        run: mv .pio/build/${{ matrix.environment }}/firmware.bin .pio/build/${{ matrix.environment }}/opendtu-${{ matrix.environment }}.bin
+        run: mv .pio/build/${{ matrix.environment }}/firmware.bin .pio/build/${{ matrix.environment }}/opendtu-onbattery-${{ matrix.environment }}.bin
 
       - name: Rename Factory Firmware
-        run: mv .pio/build/${{ matrix.environment }}/firmware.factory.bin .pio/build/${{ matrix.environment }}/opendtu-${{ matrix.environment }}.factory.bin
+        run: mv .pio/build/${{ matrix.environment }}/firmware.factory.bin .pio/build/${{ matrix.environment }}/opendtu-onbattery-${{ matrix.environment }}.factory.bin
 
       - uses: actions/upload-artifact@v4
         with:
-          name: opendtu-${{ matrix.environment }}
+          name: opendtu-onbattery-${{ matrix.environment }}
           path: |
-            .pio/build/${{ matrix.environment }}/opendtu-${{ matrix.environment }}.bin
+            .pio/build/${{ matrix.environment }}/opendtu-onbattery-${{ matrix.environment }}.bin
-            .pio/build/${{ matrix.environment }}/opendtu-${{ matrix.environment }}.factory.bin
+            !.pio/build/generic_esp32_4mb_no_ota/opendtu-onbattery-generic_esp32_4mb_no_ota.bin
+            .pio/build/${{ matrix.environment }}/opendtu-onbattery-${{ matrix.environment }}.factory.bin
 
   release:
     name: Create Release
     runs-on: ubuntu-latest
     needs: [get_default_envs, build]
-    if: startsWith(github.ref, 'refs/tags/')
+    if: startsWith(github.ref, 'refs/tags/2')
     steps:
       - name: Checkout
         uses: actions/checkout@v4
 
+      - name: Get tags
+        run: git fetch --force --tags origin
+
+      - name: Get openDTU core release
+        run: |
+          echo "OPEN_DTU_CORE_RELEASE=$(git for-each-ref --sort=creatordate --format '%(refname) %(creatordate)' refs/tags | grep 'refs/tags/v' | tail -1 | sed 's#.*/##' | sed 's/ .*//')" >> $GITHUB_ENV
+
+# disabled as uploading the changed gist failed repeatedly.
+# maybe the token in secrets.GIST_SECRET has expired?
+# need help from repo owner @helgeerbe to fix this.
+#      - name: Create openDTU-core-release-Badge
+#        uses: schneegans/dynamic-badges-action@v1.6.0
+#        with:
+#          auth: ${{ secrets.GIST_SECRET }}
+#          gistID: 68b47cc8c8994d04ab3a4fa9d8aee5e6
+#          filename: openDTUcoreRelease.json
+#          label: based on original OpenDTU
+#          message: ${{ env.OPEN_DTU_CORE_RELEASE }}
+#          color: lightblue
+
       - name: Build Changelog
         id: github_release
         uses: mikepenz/release-changelog-builder-action@v4
@@ -144,7 +179,7 @@ jobs:
         run: |
           ls -R
           cd artifacts
-          for i in */; do cp ${i}opendtu-*.bin ./; done
+          for i in */; do cp ${i}opendtu-onbattery-*.bin ./; done
 
       - name: Create release
         uses: softprops/action-gh-release@v2
@@ -154,4 +189,4 @@ jobs:
           files: |
             artifacts/*.zip, artifacts/*.bin
         env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GITHUB_TOKEN: ${{ secrets.RELEASE_TOKEN }}

.github/workflows/config/release-notes-config.json

@@ -36,7 +36,7 @@
         }
     ],
     "template": "${{CHANGELOG}}",
-    "pr_template": "- [${{TITLE}}](https://github.com/tbnobody/OpenDTU/commit/${{MERGE_SHA}})",
+    "pr_template": "- [${{TITLE}}](https://github.com/helgeerbe/OpenDTU-OnBattery/commit/${{MERGE_SHA}})",
     "empty_template": "- no changes",
     "label_extractor": [
         {

.github/workflows/cpplint.yml

@@ -6,6 +6,10 @@ jobs:
   build:
     runs-on: ubuntu-latest
 
+    # prevent push event from triggering if it's part of a local PR, see
+    # https://github.com/orgs/community/discussions/57827#discussioncomment-6579237
+    if: github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name != github.event.pull_request.base.repo.full_name
+
     steps:
       - uses: actions/checkout@v4
       - name: Set up Python
@@ -18,4 +22,6 @@ jobs:
           pip install cpplint
       - name: Linting
         run: |
-          cpplint --repository=. --recursive --filter=-build/c++11,-runtime/references,-readability/braces,-whitespace,-legal,-build/include ./src ./include ./lib/Hoymiles ./lib/MqttSubscribeParser ./lib/TimeoutHelper ./lib/ResetReason
+          cpplint --repository=. --recursive \
+            --filter=-build/c++11,-runtime/references,-readability/braces,-whitespace,-legal,-build/include \
+            ./src ./include ./lib/Hoymiles ./lib/MqttSubscribeParser ./lib/TimeoutHelper ./lib/ResetReason

.github/workflows/yarnlint.yml

@@ -6,6 +6,10 @@ jobs:
   build:
     runs-on: ubuntu-latest
 
+    # prevent push event from triggering if it's part of a local PR, see
+    # https://github.com/orgs/community/discussions/57827#discussioncomment-6579237
+    if: github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name != github.event.pull_request.base.repo.full_name
+
     defaults:
       run:
         working-directory: webapp

.github/workflows/yarnprettier.yml

@@ -6,6 +6,10 @@ jobs:
   build:
     runs-on: ubuntu-latest
 
+    # prevent push event from triggering if it's part of a local PR, see
+    # https://github.com/orgs/community/discussions/57827#discussioncomment-6579237
+    if: github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name != github.event.pull_request.base.repo.full_name
+
     defaults:
       run:
         working-directory: webapp

.gitignore

@@ -7,4 +7,5 @@
 platformio-device-monitor*.log
 logs/device-monitor*.log
 platformio_override.ini
+webapp_dist/
 .DS_Store

.vscode/settings.json

@@ -1,3 +1,63 @@
 {
-    "C_Cpp.clang_format_style": "WebKit"
+    "C_Cpp.clang_format_style": "WebKit",
+    "files.associations": {
+        "*.tcc": "cpp",
+        "algorithm": "cpp",
+        "array": "cpp",
+        "atomic": "cpp",
+        "bitset": "cpp",
+        "cctype": "cpp",
+        "chrono": "cpp",
+        "clocale": "cpp",
+        "cmath": "cpp",
+        "condition_variable": "cpp",
+        "cstdarg": "cpp",
+        "cstddef": "cpp",
+        "cstdint": "cpp",
+        "cstdio": "cpp",
+        "cstdlib": "cpp",
+        "cstring": "cpp",
+        "ctime": "cpp",
+        "cwchar": "cpp",
+        "cwctype": "cpp",
+        "deque": "cpp",
+        "list": "cpp",
+        "unordered_map": "cpp",
+        "unordered_set": "cpp",
+        "vector": "cpp",
+        "exception": "cpp",
+        "functional": "cpp",
+        "iterator": "cpp",
+        "map": "cpp",
+        "memory": "cpp",
+        "memory_resource": "cpp",
+        "numeric": "cpp",
+        "optional": "cpp",
+        "random": "cpp",
+        "ratio": "cpp",
+        "regex": "cpp",
+        "string": "cpp",
+        "string_view": "cpp",
+        "system_error": "cpp",
+        "tuple": "cpp",
+        "type_traits": "cpp",
+        "utility": "cpp",
+        "fstream": "cpp",
+        "initializer_list": "cpp",
+        "iomanip": "cpp",
+        "iosfwd": "cpp",
+        "iostream": "cpp",
+        "istream": "cpp",
+        "limits": "cpp",
+        "mutex": "cpp",
+        "new": "cpp",
+        "ostream": "cpp",
+        "sstream": "cpp",
+        "stdexcept": "cpp",
+        "streambuf": "cpp",
+        "thread": "cpp",
+        "cinttypes": "cpp",
+        "typeinfo": "cpp",
+        "variant": "cpp"
+    }
 }

README.md

@@ -1,43 +1,93 @@
-# OpenDTU
+[![OpenDTU-OnBattery Build](https://github.com/hoylabs/OpenDTU-OnBattery/actions/workflows/build.yml/badge.svg)](https://github.com/hoylabs/OpenDTU-OnBattery/actions/workflows/build.yml)
+[![cpplint](https://github.com/hoylabs/OpenDTU-OnBattery/actions/workflows/cpplint.yml/badge.svg)](https://github.com/hoylabs/OpenDTU-OnBattery/actions/workflows/cpplint.yml)
+[![Yarn Linting](https://github.com/hoylabs/OpenDTU-OnBattery/actions/workflows/yarnlint.yml/badge.svg)](https://github.com/hoylabs/OpenDTU-OnBattery/actions/workflows/yarnlint.yml)
+<!---
+disabled while "create release badge" action is broken, see .github/build.yml
+![GitHub tag (latest SemVer)](https://img.shields.io/endpoint?url=https://gist.githubusercontent.com/helgeerbe/68b47cc8c8994d04ab3a4fa9d8aee5e6/raw/openDTUcoreRelease.json)
+--->
 
-[![OpenDTU Build](https://github.com/tbnobody/OpenDTU/actions/workflows/build.yml/badge.svg)](https://github.com/tbnobody/OpenDTU/actions/workflows/build.yml)
+- [OpenDTU-OnBattery](#opendtu-onbattery)
-[![cpplint](https://github.com/tbnobody/OpenDTU/actions/workflows/cpplint.yml/badge.svg)](https://github.com/tbnobody/OpenDTU/actions/workflows/cpplint.yml)
+  - [Getting Started](#getting-started)
-[![Yarn Linting](https://github.com/tbnobody/OpenDTU/actions/workflows/yarnlint.yml/badge.svg)](https://github.com/tbnobody/OpenDTU/actions/workflows/yarnlint.yml)
+  - [Important Differences](#important-differences)
+  - [Documentation](#documentation)
+  - [Project State](#project-state)
+  - [Project History](#project-history)
+  - [Acknowledgments](#acknowledgments)
 
-## !! IMPORTANT UPGRADE NOTES !!
+# OpenDTU-OnBattery
 
-If you are upgrading from a version before 15.03.2023 you have to upgrade the partition table of the ESP32. Please follow the [this](docs/UpgradePartition.md) documentation!
+OpenDTU-OnBattery is a fork of [OpenDTU](https://github.com/tbnobody/OpenDTU),
+which adds support for battery chargers, battery management systems (BMS), and
+power meters on a single ESP32. Its Dynamic Power Limiter can adjust the
+inverter's power production to the actual houshold consumption. In this way, it
+is possible to implement a zero export policy.
 
-## Background
+## Getting Started
 
-This project was started from [this](https://www.mikrocontroller.net/topic/525778) discussion (Mikrocontroller.net).
+See the documentation to learn [what hardware](https://opendtu-onbattery.net/hardware/)
-It was the goal to replace the original Hoymiles DTU (Telemetry Gateway) with their cloud access. With a lot of reverse engineering the Hoymiles protocol was decrypted and analyzed.
+to acquire, how to [initialize](https://opendtu-onbattery.net/firmware/) it
+with OpenDTU-OnBattery firmware, and how to
+[configure](https://opendtu-onbattery.net/firmware/device_profiles/)
+OpenDTU-OnBattery for your hardware.
+
+## Important Differences
+
+Generally speaking, OpenDTU-OnBattery and the upstream project are compatible
+with each other, because OpenDTU-OnBattery mostly only extends the upstream
+project. However, there are a few notable differences aside from the added functionality:
+
+* OpenDTU-OnBattery, due to its code footprint, cannot offer support for
+  over-the-air (OTA) updates on ESP32 with only 4MB of flash memory. Consult
+  the [documentation](https://opendtu-onbattery.net/firmware/howto/upgrade_8mb/#background)
+  to learn more.
+* Unlike in the upstream project, you **must** compile the web application
+  yourself when attempting to build your own firmware blob. See the
+  [documentation](https://opendtu-onbattery.net/firmware/compile_webapp/) for
+  details.
 
 ## Documentation
 
-The documentation can be found [here](https://tbnobody.github.io/OpenDTU-docs/).
+The canonical documentation of OpenDTU-OnBattery is hosted at
-Please feel free to support and create a PR in [this](https://github.com/tbnobody/OpenDTU-docs) repository to make the documentation even better.
+[https://opendtu-onbattery.net](https://opendtu-onbattery.net).
 
-## Breaking changes
+You may find additional helpful information in the project's
+community-maintained [Github
+Wiki](https://github.com/hoylabs/OpenDTU-OnBattery/wiki).
 
-Generated using: `git log --date=short --pretty=format:"* %h%x09%ad%x09%s" | grep BREAKING`
+To find out what's new or improved have a look at the
+[releases](https://github.com/hoylabs/OpenDTU-OnBattery/releases).
 
-```code
+## Project State
-* 1b637f08      2024-01-30      BREAKING CHANGE: Web API Endpoint /api/livedata/status and /api/prometheus/metrics
-* e1564780      2024-01-30      BREAKING CHANGE: Web API Endpoint /api/livedata/status and /api/prometheus/metrics
-* f0b5542c      2024-01-30      BREAKING CHANGE: Web API Endpoint /api/livedata/status and /api/prometheus/metrics
-* c27ecc36      2024-01-29      BREAKING CHANGE: Web API Endpoint /api/livedata/status
-* 71d1b3b       2023-11-07      BREAKING CHANGE: Home Assistant Auto Discovery to new naming scheme
-* 04f62e0       2023-04-20      BREAKING CHANGE: Web API Endpoint /api/eventlog/status no nested serial object
-* 59f43a8       2023-04-17      BREAKING CHANGE: Web API Endpoint /api/devinfo/status requires GET parameter inv=
-* 318136d       2023-03-15      BREAKING CHANGE: Updated partition table: Make sure you have a configuration backup and completly reflash the device!
-* 3b7aef6       2023-02-13      BREAKING CHANGE: Web API!
-* d4c838a       2023-02-06      BREAKING CHANGE: Prometheus API!
-* daf847e       2022-11-14      BREAKING CHANGE: Removed deprecated config parsing method
-* 69b675b       2022-11-01      BREAKING CHANGE: Structure WebAPI /api/livedata/status changed
-* 27ed4e3       2022-10-31      BREAKING: Change power factor from percent value to value between 0 and 1
-```
 
-## Currently supported Inverters
+OpenDTU-OnBattery is actively maintained. Please note that OpenDTU-OnBattery
+may change significantly during its development. Bug reports, comments, feature
+requests and pull requests are welcome!
 
-A list of all currently supported inverters can be found [here](https://www.opendtu.solar/hardware/inverter_overview/)
+## Project History
+
+The original OpenDTU project was started from [a discussion on
+Mikrocontroller.net](https://www.mikrocontroller.net/topic/525778). The
+original ambition was to replace the original Hoymiles DTU (Telemetry Gateway)
+to avoid using Hoymile's cloud. With a lot of reverse engineering, the Hoymiles
+protocol was decrypted and analyzed.
+
+In the summer of 2022 [@helgeerbe](https://github.com/helgeerbe) bought a
+Victron MPPT charge controller, and didn't like the idea to set up a separate
+ESP32 to receive the charger's data. He decided to fork OpenDTU and extend it
+with battery charger support and a Dynamic Power Limiter.
+
+In early October 2024, the project moved to the newly founded GitHub
+organisation `hoylabs` and is since maintained by multiple community members.
+
+## Acknowledgments
+
+* Special thanks to Thomas Basler ([@tbnobody](https://github.com/tbnobody)),
+  the author of the [upstream project](https://github.com/tbnobody/OpenDTU),
+  for his continued effort!
+* Thanks to [@helgeerbe](https://github.com/helgeerbe) for starting
+  OpenDTU-OnBattery, for his dedication to the project, as well as for his
+  trust in the current maintainers of the project, which act as part of the
+  `hoylabs` GitHub organisation.
+* We like to thank all contributors. With your ideas and enhancements, you have
+  made OpenDTU-OnBattery much more than
+  [@helgeerbe](https://github.com/helgeerbe) originally had in mind.

README_onBattery.md

@@ -0,0 +1,3 @@
+# Moved
+
+Have a look at the [OpenDTU-OnBattery documentation](https://opendtu-onbattery.net).

docs/DeviceProfiles.md

@@ -1,3 +1,3 @@
-# Device Profiles
+# Moved
 
-This documentation will has been moved and can be found here: <https://tbnobody.github.io/OpenDTU-docs/firmware/device_profiles/>
+Have a look at the [OpenDTU-OnBattery documentation](https://opendtu-onbattery.net/firmware/device_profiles/).

docs/Display.md

@@ -1,3 +1,3 @@
-# Display integration
+# Moved
 
-This documentation will has been moved and can be found here: <https://tbnobody.github.io/OpenDTU-docs/hardware/display/>
+Have a look at the [OpenDTU-OnBattery documentation](https://opendtu-onbattery.net/hardware/display/).

docs/MQTT_Topics.md

@@ -1,3 +1,3 @@
-# MQTT Topics
+# Moved
 
-This documentation will has been moved and can be found here: <https://tbnobody.github.io/OpenDTU-docs/firmware/mqtt_topics/>
+Have a look at the [OpenDTU-OnBattery documentation](https://opendtu-onbattery.net/firmware/mqtt_topics/).

docs/README.md

@@ -1,13 +1,3 @@
-# Documents - Table of content
+# Moved
 
-More detailed descriptions for some topics can be found here.
+Have a look at the [OpenDTU-OnBattery documentation](https://opendtu-onbattery.net).
-
-## [Display Documentation](Display.md)
-
-## [MQTT Topic Documentation](MQTT_Topics.md)
-
-## [Web API Documentation](Web-API.md)
-
-## [Device Profile Documentation](DeviceProfiles.md)
-
-## [Builds](builds/README.md)

docs/UpgradePartition.md

@@ -1,3 +1,3 @@
-# Upgrade Partition
+# Moved
 
-This documentation has been moved and can be found here: <https://tbnobody.github.io/OpenDTU-docs/firmware/howto/upgrade_partition/>
+Have a look at the [OpenDTU-OnBattery documentation](https://opendtu-onbattery.net/firmware/howto/upgrade_8mb/).

docs/Web-API.md

@@ -1,3 +1,3 @@
-# Web API
+# Moved
 
-This documentation will has been moved and can be found here: <https://tbnobody.github.io/OpenDTU-docs/firmware/web_api/>
+Have a look at the [OpenDTU-OnBattery documentation](https://opendtu-onbattery.net/firmware/web_api/).

docs/builds/README.md

@@ -1,28 +0,0 @@
-# Builds using different boards
-
-## ESP32 Dev Board
-
-### Build by @tbnobody, jan and @marove2000
-* Used build environment: generic
-* Case: https://www.printables.com/de/model/441037-opendtu-breakoutboard-case
-* Soldering Kit: https://shop.blinkyparts.com/en/OpenDTU-Breakoutboard-Your-evaluation-for-your-balcony-solar-system/blink237542
-* Breakout board: https://github.com/marove2000/openDTU_BreakoutBoard
-![](opendtu_breakoutboard.jpg)
-![](thumbnail.jpg)
-
-### Build by @Marc--
-* Used build environment: generic
-* Case: https://www.thingiverse.com/thing:5435911
-![](large_display_PXL_20220715_145622277.jpg)
-
-### Build by @cepresso
-* Used build environment: generic
-* Case: https://www.printables.com/de/model/293003-sol-opendtu-esp32-nrf24l01-case
-![](sol.webp)
-
-## LILYGO® TTGO T-Internet-POE
-### Build by @fromCologne
-* Used build environment: LilyGO_T_ETH_POE
-* Board info: http://www.lilygo.cn/claprod_view.aspx?TypeId=21&Id=1344&FId=t28:21:28
-* Case: https://www.thingiverse.com/thing:5244895
-![](202654506-8a4ac4ef-c883-490e-8ee1-1e1f7fa34972.jpg)

docs/hardware_flash.md

@@ -0,0 +1,3 @@
+# Moved
+
+Have a look at the [OpenDTU-OnBattery documentation](https://opendtu-onbattery.net/firmware/).

docs/screenshots/README.md

@@ -1,91 +0,0 @@
-# OpenDTU Screenshots
-
-here are some screenshots of OpenDTU's web interface.
-
-***
-
-![Live View](01_LiveView.png)
-
-***
-
-![Limit Settings](15_LimitSettings.png)
-
-***
-
-![Power Settings](16_PowerSettings.png)
-
-***
-
-![Inverter Info](17_InverterInfo.png)
-
-***
-
-![Eventlog](12_Eventlog.png)
-
-***
-
-![Network Admin](02_NetworkAdmin.png)
-
-***
-
-![NTP Admin](03_NtpAdmin.png)
-
-***
-
-![MQTT Admin](04_MqttAdmin.png)
-
-***
-
-![Inverter Admin](05_InverterAdmin.png)
-
-***
-
-![Inverter Settings](13_InverterSettings.png)
-
-***
-
-![Security](22_Security.png)
-
-***
-
-![DTU Admin](06_DtuAdmin.png)
-
-***
-
-![Device Manager Pin](20_DeviceManager_Pin.png)
-
-***
-
-![Device Manager Display](21_DeviceManager_Display.png)
-
-***
-
-![Config Management](14_ConfigManagement.png)
-
-***
-
-![Firmware Upgrade](07_FirmwareUpgrade.png)
-
-***
-
-![Reboot](19_Reboot.png)
-
-***
-
-![System Info](11_SystemInfo.png)
-
-***
-
-![Network Info](08_NetworkInfo.png)
-
-***
-
-![NTP Info](09_NtpInfo.png)
-
-***
-
-![MQTT Info](10_MqttInfo.png)
-
-***
-
-![Console](18_Console.png)

include/Battery.h

@@ -0,0 +1,36 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#pragma once
+
+#include <memory>
+#include <mutex>
+#include <TaskSchedulerDeclarations.h>
+
+#include "BatteryStats.h"
+
+class BatteryProvider {
+public:
+    // returns true if the provider is ready for use, false otherwise
+    virtual bool init(bool verboseLogging) = 0;
+    virtual void deinit() = 0;
+    virtual void loop() = 0;
+    virtual std::shared_ptr<BatteryStats> getStats() const = 0;
+};
+
+class BatteryClass {
+public:
+    void init(Scheduler&);
+    void updateSettings();
+
+    float getDischargeCurrentLimit();
+
+    std::shared_ptr<BatteryStats const> getStats() const;
+
+private:
+    void loop();
+
+    Task _loopTask;
+    mutable std::mutex _mutex;
+    std::unique_ptr<BatteryProvider> _upProvider = nullptr;
+};
+
+extern BatteryClass Battery;

include/BatteryCanReceiver.h

@@ -0,0 +1,29 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#pragma once
+
+#include "Battery.h"
+#include <driver/twai.h>
+#include <Arduino.h>
+
+class BatteryCanReceiver : public BatteryProvider {
+public:
+    bool init(bool verboseLogging, char const* providerName);
+    void deinit() final;
+    void loop() final;
+
+    virtual void onMessage(twai_message_t rx_message) = 0;
+
+protected:
+    uint8_t readUnsignedInt8(uint8_t *data);
+    uint16_t readUnsignedInt16(uint8_t *data);
+    int16_t readSignedInt16(uint8_t *data);
+    uint32_t readUnsignedInt32(uint8_t *data);
+    int32_t readSignedInt24(uint8_t *data);
+    float scaleValue(int32_t value, float factor);
+    bool getBit(uint8_t value, uint8_t bit);
+
+    bool _verboseLogging = true;
+
+private:
+    char const* _providerName = "Battery CAN";
+};

include/BatteryStats.h

@@ -0,0 +1,354 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#pragma once
+
+#include <stdint.h>
+
+#include "AsyncJson.h"
+#include "Arduino.h"
+#include "JkBmsDataPoints.h"
+#include "JbdBmsDataPoints.h"
+#include "VeDirectShuntController.h"
+#include <cfloat>
+
+// mandatory interface for all kinds of batteries
+class BatteryStats {
+    public:
+        String const& getManufacturer() const { return _manufacturer; }
+
+        // the last time *any* data was updated
+        uint32_t getAgeSeconds() const { return (millis() - _lastUpdate) / 1000; }
+        bool updateAvailable(uint32_t since) const;
+
+        float getSoC() const { return _soc; }
+        uint32_t getSoCAgeSeconds() const { return (millis() - _lastUpdateSoC) / 1000; }
+        uint8_t getSoCPrecision() const { return _socPrecision; }
+
+        float getVoltage() const { return _voltage; }
+        uint32_t getVoltageAgeSeconds() const { return (millis() - _lastUpdateVoltage) / 1000; }
+
+        float getChargeCurrent() const { return _current; };
+        uint8_t getChargeCurrentPrecision() const { return _currentPrecision; }
+
+        float getDischargeCurrentLimit() const { return _dischargeCurrentLimit; };
+        uint32_t getDischargeCurrentLimitAgeSeconds() const { return (millis() - _lastUpdateDischargeCurrentLimit) / 1000; }
+
+        // convert stats to JSON for web application live view
+        virtual void getLiveViewData(JsonVariant& root) const;
+
+        void mqttLoop();
+
+        // the interval at which all battery data will be re-published, even
+        // if they did not change. used to calculate Home Assistent expiration.
+        virtual uint32_t getMqttFullPublishIntervalMs() const;
+
+        bool isSoCValid() const { return _lastUpdateSoC > 0; }
+        bool isVoltageValid() const { return _lastUpdateVoltage > 0; }
+        bool isCurrentValid() const { return _lastUpdateCurrent > 0; }
+        bool isDischargeCurrentLimitValid() const { return _lastUpdateDischargeCurrentLimit > 0; }
+
+        // returns true if the battery reached a critically low voltage/SoC,
+        // such that it is in need of charging to prevent degredation.
+        virtual bool getImmediateChargingRequest() const { return false; };
+
+        virtual float getChargeCurrentLimitation() const { return FLT_MAX; };
+
+        virtual bool supportsAlarmsAndWarnings() const { return true; };
+
+    protected:
+        virtual void mqttPublish() const;
+
+        void setSoC(float soc, uint8_t precision, uint32_t timestamp) {
+            _soc = soc;
+            _socPrecision = precision;
+            _lastUpdateSoC = _lastUpdate = timestamp;
+        }
+
+        void setVoltage(float voltage, uint32_t timestamp) {
+            _voltage = voltage;
+            _lastUpdateVoltage = _lastUpdate = timestamp;
+        }
+
+        void setCurrent(float current, uint8_t precision, uint32_t timestamp) {
+            _current = current;
+            _currentPrecision = precision;
+            _lastUpdateCurrent = _lastUpdate = timestamp;
+        }
+
+        void setDischargeCurrentLimit(float dischargeCurrentLimit, uint32_t timestamp) {
+            _dischargeCurrentLimit = dischargeCurrentLimit;
+            _lastUpdateDischargeCurrentLimit = _lastUpdate = timestamp;
+        }
+
+        void setManufacturer(const String& m);
+
+        String _hwversion = "";
+        String _fwversion = "";
+        String _serial = "";
+        uint32_t _lastUpdate = 0;
+
+    private:
+        String _manufacturer = "unknown";
+        uint32_t _lastMqttPublish = 0;
+        float _soc = 0;
+        uint8_t _socPrecision = 0; // decimal places
+        uint32_t _lastUpdateSoC = 0;
+        float _voltage = 0; // total battery pack voltage
+        uint32_t _lastUpdateVoltage = 0;
+
+        // total current into (positive) or from (negative)
+        // the battery, i.e., the charging current
+        float _current = 0;
+        uint8_t _currentPrecision = 0; // decimal places
+        uint32_t _lastUpdateCurrent = 0;
+
+        float _dischargeCurrentLimit = 0;
+        uint32_t _lastUpdateDischargeCurrentLimit = 0;
+};
+
+class PylontechBatteryStats : public BatteryStats {
+    friend class PylontechCanReceiver;
+
+    public:
+        void getLiveViewData(JsonVariant& root) const final;
+        void mqttPublish() const final;
+        bool getImmediateChargingRequest() const { return _chargeImmediately; } ;
+        float getChargeCurrentLimitation() const { return _chargeCurrentLimitation; } ;
+
+    private:
+        void setLastUpdate(uint32_t ts) { _lastUpdate = ts; }
+
+        float _chargeVoltage;
+        float _chargeCurrentLimitation;
+        float _dischargeVoltageLimitation;
+        uint16_t _stateOfHealth;
+        float _temperature;
+
+        bool _alarmOverCurrentDischarge;
+        bool _alarmOverCurrentCharge;
+        bool _alarmUnderTemperature;
+        bool _alarmOverTemperature;
+        bool _alarmUnderVoltage;
+        bool _alarmOverVoltage;
+        bool _alarmBmsInternal;
+
+        bool _warningHighCurrentDischarge;
+        bool _warningHighCurrentCharge;
+        bool _warningLowTemperature;
+        bool _warningHighTemperature;
+        bool _warningLowVoltage;
+        bool _warningHighVoltage;
+        bool _warningBmsInternal;
+
+        bool _chargeEnabled;
+        bool _dischargeEnabled;
+        bool _chargeImmediately;
+
+        uint8_t _moduleCount;
+};
+
+class SBSBatteryStats : public BatteryStats {
+    friend class SBSCanReceiver;
+
+    public:
+        void getLiveViewData(JsonVariant& root) const final;
+        void mqttPublish() const final;
+        float getChargeCurrent() const { return _current; } ;
+        float getChargeCurrentLimitation() const { return _chargeCurrentLimitation; } ;
+
+    private:
+        void setLastUpdate(uint32_t ts) { _lastUpdate = ts; }
+
+        float _chargeVoltage;
+        float _chargeCurrentLimitation;
+        uint16_t _stateOfHealth;
+        float _current;
+        float _temperature;
+
+        bool _alarmUnderTemperature;
+        bool _alarmOverTemperature;
+        bool _alarmUnderVoltage;
+        bool _alarmOverVoltage;
+        bool _alarmBmsInternal;
+
+        bool _warningHighCurrentDischarge;
+        bool _warningHighCurrentCharge;
+
+        bool _chargeEnabled;
+        bool _dischargeEnabled;
+};
+
+class PytesBatteryStats : public BatteryStats {
+    friend class PytesCanReceiver;
+
+    public:
+        void getLiveViewData(JsonVariant& root) const final;
+        void mqttPublish() const final;
+        bool getImmediateChargingRequest() const { return _chargeImmediately; };
+        float getChargeCurrentLimitation() const { return _chargeCurrentLimit; };
+
+    private:
+        void setLastUpdate(uint32_t ts) { _lastUpdate = ts; }
+        void updateSerial() {
+            if (!_serialPart1.isEmpty() && !_serialPart2.isEmpty()) {
+                _serial = _serialPart1 + _serialPart2;
+            }
+        }
+
+        String _serialPart1 = "";
+        String _serialPart2 = "";
+
+        float _chargeVoltageLimit;
+        float _chargeCurrentLimit;
+        float _dischargeVoltageLimit;
+
+        uint16_t _stateOfHealth;
+        int _chargeCycles = -1;
+        int _balance = -1;
+
+        float _temperature;
+
+        uint16_t _cellMinMilliVolt;
+        uint16_t _cellMaxMilliVolt;
+        float _cellMinTemperature;
+        float _cellMaxTemperature;
+
+        String _cellMinVoltageName;
+        String _cellMaxVoltageName;
+        String _cellMinTemperatureName;
+        String _cellMaxTemperatureName;
+
+        uint8_t _moduleCountOnline;
+        uint8_t _moduleCountOffline;
+
+        uint8_t _moduleCountBlockingCharge;
+        uint8_t _moduleCountBlockingDischarge;
+
+        float _totalCapacity;
+        float _availableCapacity;
+        uint8_t _capacityPrecision = 0; // decimal places
+
+        float _chargedEnergy = -1;
+        float _dischargedEnergy = -1;
+
+        bool _alarmUnderVoltage;
+        bool _alarmOverVoltage;
+        bool _alarmOverCurrentCharge;
+        bool _alarmOverCurrentDischarge;
+        bool _alarmUnderTemperature;
+        bool _alarmOverTemperature;
+        bool _alarmUnderTemperatureCharge;
+        bool _alarmOverTemperatureCharge;
+        bool _alarmInternalFailure;
+        bool _alarmCellImbalance;
+
+        bool _warningLowVoltage;
+        bool _warningHighVoltage;
+        bool _warningHighChargeCurrent;
+        bool _warningHighDischargeCurrent;
+        bool _warningLowTemperature;
+        bool _warningHighTemperature;
+        bool _warningLowTemperatureCharge;
+        bool _warningHighTemperatureCharge;
+        bool _warningInternalFailure;
+        bool _warningCellImbalance;
+
+        bool _chargeImmediately;
+};
+
+class JkBmsBatteryStats : public BatteryStats {
+    public:
+        void getLiveViewData(JsonVariant& root) const final {
+            getJsonData(root, false);
+        }
+
+        void getInfoViewData(JsonVariant& root) const {
+            getJsonData(root, true);
+        }
+
+        void mqttPublish() const final;
+
+        uint32_t getMqttFullPublishIntervalMs() const final { return 60 * 1000; }
+
+        void updateFrom(JkBms::DataPointContainer const& dp);
+
+    private:
+        void getJsonData(JsonVariant& root, bool verbose) const;
+
+        JkBms::DataPointContainer _dataPoints;
+        mutable uint32_t _lastMqttPublish = 0;
+        mutable uint32_t _lastFullMqttPublish = 0;
+
+        uint16_t _cellMinMilliVolt = 0;
+        uint16_t _cellAvgMilliVolt = 0;
+        uint16_t _cellMaxMilliVolt = 0;
+        uint32_t _cellVoltageTimestamp = 0;
+};
+
+class JbdBmsBatteryStats : public BatteryStats {
+    public:
+        void getLiveViewData(JsonVariant& root) const final {
+            getJsonData(root, false);
+        }
+
+        void getInfoViewData(JsonVariant& root) const {
+            getJsonData(root, true);
+        }
+
+        void mqttPublish() const final;
+
+        uint32_t getMqttFullPublishIntervalMs() const final { return 60 * 1000; }
+
+        void updateFrom(JbdBms::DataPointContainer const& dp);
+
+    private:
+        void getJsonData(JsonVariant& root, bool verbose) const;
+
+        JbdBms::DataPointContainer _dataPoints;
+        mutable uint32_t _lastMqttPublish = 0;
+        mutable uint32_t _lastFullMqttPublish = 0;
+
+        uint16_t _cellMinMilliVolt = 0;
+        uint16_t _cellAvgMilliVolt = 0;
+        uint16_t _cellMaxMilliVolt = 0;
+        uint32_t _cellVoltageTimestamp = 0;
+};
+
+class VictronSmartShuntStats : public BatteryStats {
+    public:
+        void getLiveViewData(JsonVariant& root) const final;
+        void mqttPublish() const final;
+
+        void updateFrom(VeDirectShuntController::data_t const& shuntData);
+
+    private:
+        float _temperature;
+        bool _tempPresent;
+        uint8_t _chargeCycles;
+        uint32_t _timeToGo;
+        float _chargedEnergy;
+        float _dischargedEnergy;
+        int32_t _instantaneousPower;
+        float _midpointVoltage;
+        float _midpointDeviation;
+        float _consumedAmpHours;
+        int32_t _lastFullCharge;
+
+        bool _alarmLowVoltage;
+        bool _alarmHighVoltage;
+        bool _alarmLowSOC;
+        bool _alarmLowTemperature;
+        bool _alarmHighTemperature;
+};
+
+class MqttBatteryStats : public BatteryStats {
+    friend class MqttBattery;
+
+    public:
+        // since the source of information was MQTT in the first place,
+        // we do NOT publish the same data under a different topic.
+        void mqttPublish() const final { }
+
+        void getLiveViewData(JsonVariant& root) const final;
+
+        bool supportsAlarmsAndWarnings() const final { return false; }
+};

include/Configuration.h

@@ -3,6 +3,7 @@
 
 #include "PinMapping.h"
 #include <cstdint>
+#include <ArduinoJson.h>
 #include <TaskSchedulerDeclarations.h>
 #include <mutex>
 #include <condition_variable>
@@ -14,6 +15,8 @@
 #define WIFI_MAX_PASSWORD_STRLEN 64
 #define WIFI_MAX_HOSTNAME_STRLEN 31
 
+#define SYSLOG_MAX_HOSTNAME_STRLEN 128
+
 #define NTP_MAX_SERVER_STRLEN 31
 #define NTP_MAX_TIMEZONE_STRLEN 50
 #define NTP_MAX_TIMEZONEDESCR_STRLEN 50
@@ -22,7 +25,7 @@
 #define MQTT_MAX_CLIENTID_STRLEN 64
 #define MQTT_MAX_USERNAME_STRLEN 64
 #define MQTT_MAX_PASSWORD_STRLEN 64
-#define MQTT_MAX_TOPIC_STRLEN 32
+#define MQTT_MAX_TOPIC_STRLEN 256
 #define MQTT_MAX_LWTVALUE_STRLEN 20
 #define MQTT_MAX_CERT_STRLEN 2560
 
@@ -35,6 +38,17 @@
 #define DEV_MAX_MAPPING_NAME_STRLEN 63
 #define LOCALE_STRLEN 2
 
+#define HTTP_REQUEST_MAX_URL_STRLEN 1024
+#define HTTP_REQUEST_MAX_USERNAME_STRLEN 64
+#define HTTP_REQUEST_MAX_PASSWORD_STRLEN 64
+#define HTTP_REQUEST_MAX_HEADER_KEY_STRLEN 64
+#define HTTP_REQUEST_MAX_HEADER_VALUE_STRLEN 256
+
+#define POWERMETER_MQTT_MAX_VALUES 3
+#define POWERMETER_HTTP_JSON_MAX_VALUES 3
+#define POWERMETER_HTTP_JSON_MAX_PATH_STRLEN 256
+#define BATTERY_JSON_MAX_PATH_STRLEN 128
+
 struct CHANNEL_CONFIG_T {
     uint16_t MaxChannelPower;
     char Name[CHAN_MAX_NAME_STRLEN];
@@ -57,6 +71,130 @@ struct INVERTER_CONFIG_T {
     CHANNEL_CONFIG_T channel[INV_MAX_CHAN_COUNT];
 };
 
+struct HTTP_REQUEST_CONFIG_T {
+    char Url[HTTP_REQUEST_MAX_URL_STRLEN + 1];
+
+    enum Auth { None, Basic, Digest };
+    Auth AuthType;
+
+    char Username[HTTP_REQUEST_MAX_USERNAME_STRLEN + 1];
+    char Password[HTTP_REQUEST_MAX_PASSWORD_STRLEN + 1];
+    char HeaderKey[HTTP_REQUEST_MAX_HEADER_KEY_STRLEN + 1];
+    char HeaderValue[HTTP_REQUEST_MAX_HEADER_VALUE_STRLEN + 1];
+    uint16_t Timeout;
+};
+using HttpRequestConfig = struct HTTP_REQUEST_CONFIG_T;
+
+struct POWERMETER_MQTT_VALUE_T {
+    char Topic[MQTT_MAX_TOPIC_STRLEN + 1];
+    char JsonPath[POWERMETER_HTTP_JSON_MAX_PATH_STRLEN + 1];
+
+    enum Unit { Watts = 0, MilliWatts = 1, KiloWatts = 2 };
+    Unit PowerUnit;
+
+    bool SignInverted;
+};
+using PowerMeterMqttValue = struct POWERMETER_MQTT_VALUE_T;
+
+struct POWERMETER_MQTT_CONFIG_T {
+    PowerMeterMqttValue Values[POWERMETER_MQTT_MAX_VALUES];
+};
+using PowerMeterMqttConfig = struct POWERMETER_MQTT_CONFIG_T;
+
+struct POWERMETER_SERIAL_SDM_CONFIG_T {
+    uint32_t Address;
+    uint32_t PollingInterval;
+};
+using PowerMeterSerialSdmConfig = struct POWERMETER_SERIAL_SDM_CONFIG_T;
+
+struct POWERMETER_HTTP_JSON_VALUE_T {
+    HttpRequestConfig HttpRequest;
+    bool Enabled;
+    char JsonPath[POWERMETER_HTTP_JSON_MAX_PATH_STRLEN + 1];
+
+    enum Unit { Watts = 0, MilliWatts = 1, KiloWatts = 2 };
+    Unit PowerUnit;
+
+    bool SignInverted;
+};
+using PowerMeterHttpJsonValue = struct POWERMETER_HTTP_JSON_VALUE_T;
+
+struct POWERMETER_HTTP_JSON_CONFIG_T {
+    uint32_t PollingInterval;
+    bool IndividualRequests;
+    PowerMeterHttpJsonValue Values[POWERMETER_HTTP_JSON_MAX_VALUES];
+};
+using PowerMeterHttpJsonConfig = struct POWERMETER_HTTP_JSON_CONFIG_T;
+
+struct POWERMETER_HTTP_SML_CONFIG_T {
+    uint32_t PollingInterval;
+    HttpRequestConfig HttpRequest;
+};
+using PowerMeterHttpSmlConfig = struct POWERMETER_HTTP_SML_CONFIG_T;
+
+struct POWERLIMITER_INVERTER_CONFIG_T {
+    uint64_t Serial;
+    bool IsGoverned;
+    bool IsBehindPowerMeter;
+    bool IsSolarPowered;
+    bool UseOverscalingToCompensateShading;
+    uint16_t LowerPowerLimit;
+    uint16_t UpperPowerLimit;
+};
+using PowerLimiterInverterConfig = struct POWERLIMITER_INVERTER_CONFIG_T;
+
+struct POWERLIMITER_CONFIG_T {
+    bool Enabled;
+    bool VerboseLogging;
+    bool SolarPassThroughEnabled;
+    uint8_t SolarPassThroughLosses;
+    bool BatteryAlwaysUseAtNight;
+    int16_t TargetPowerConsumption;
+    uint16_t TargetPowerConsumptionHysteresis;
+    uint16_t BaseLoadLimit;
+    bool IgnoreSoc;
+    uint16_t BatterySocStartThreshold;
+    uint16_t BatterySocStopThreshold;
+    float VoltageStartThreshold;
+    float VoltageStopThreshold;
+    float VoltageLoadCorrectionFactor;
+    uint16_t FullSolarPassThroughSoc;
+    float FullSolarPassThroughStartVoltage;
+    float FullSolarPassThroughStopVoltage;
+    uint64_t InverterSerialForDcVoltage;
+    uint8_t InverterChannelIdForDcVoltage;
+    int8_t RestartHour;
+    uint16_t TotalUpperPowerLimit;
+    PowerLimiterInverterConfig Inverters[INV_MAX_COUNT];
+};
+using PowerLimiterConfig = struct POWERLIMITER_CONFIG_T;
+
+enum BatteryVoltageUnit { Volts = 0, DeciVolts = 1, CentiVolts = 2, MilliVolts = 3 };
+
+enum BatteryAmperageUnit { Amps = 0, MilliAmps = 1 };
+
+struct BATTERY_CONFIG_T {
+    bool Enabled;
+    bool VerboseLogging;
+    uint8_t Provider;
+    uint8_t JkBmsInterface;
+    uint8_t JkBmsPollingInterval;
+    char MqttSocTopic[MQTT_MAX_TOPIC_STRLEN + 1];
+    char MqttSocJsonPath[BATTERY_JSON_MAX_PATH_STRLEN + 1];
+    char MqttVoltageTopic[MQTT_MAX_TOPIC_STRLEN + 1];
+    char MqttVoltageJsonPath[BATTERY_JSON_MAX_PATH_STRLEN + 1];
+    BatteryVoltageUnit MqttVoltageUnit;
+    bool EnableDischargeCurrentLimit;
+    float DischargeCurrentLimit;
+    float DischargeCurrentLimitBelowSoc;
+    float DischargeCurrentLimitBelowVoltage;
+    bool UseBatteryReportedDischargeCurrentLimit;
+    char MqttDischargeCurrentTopic[MQTT_MAX_TOPIC_STRLEN + 1];
+    char MqttDischargeCurrentJsonPath[BATTERY_JSON_MAX_PATH_STRLEN + 1];
+    BatteryAmperageUnit MqttAmperageUnit;
+};
+using BatteryConfig = struct BATTERY_CONFIG_T;
+
 struct CONFIG_T {
     struct {
         uint32_t Version;
@@ -80,6 +218,12 @@ struct CONFIG_T {
         bool Enabled;
     } Mdns;
 
+    struct {
+        bool Enabled;
+        char Hostname[SYSLOG_MAX_HOSTNAME_STRLEN + 1];
+        uint16_t Port;
+    } Syslog;
+
     struct {
         char Server[NTP_MAX_SERVER_STRLEN + 1];
         char Timezone[NTP_MAX_TIMEZONE_STRLEN + 1];
@@ -92,6 +236,7 @@ struct CONFIG_T {
     struct {
         bool Enabled;
         char Hostname[MQTT_MAX_HOSTNAME_STRLEN + 1];
+        bool VerboseLogging;
         uint32_t Port;
         char ClientId[MQTT_MAX_CLIENTID_STRLEN + 1];
         char Username[MQTT_MAX_USERNAME_STRLEN + 1];
@@ -136,6 +281,7 @@ struct CONFIG_T {
             uint32_t Frequency;
             uint8_t CountryMode;
         } Cmt;
+        bool VerboseLogging;
     } Dtu;
 
     struct {
@@ -159,6 +305,42 @@ struct CONFIG_T {
         uint8_t Brightness;
     } Led_Single[PINMAPPING_LED_COUNT];
 
+    struct {
+        bool Enabled;
+        bool VerboseLogging;
+        bool UpdatesOnly;
+    } Vedirect;
+
+    struct PowerMeterConfig {
+        bool Enabled;
+        bool VerboseLogging;
+        uint32_t Source;
+        PowerMeterMqttConfig Mqtt;
+        PowerMeterSerialSdmConfig SerialSdm;
+        PowerMeterHttpJsonConfig HttpJson;
+        PowerMeterHttpSmlConfig HttpSml;
+    } PowerMeter;
+
+    PowerLimiterConfig PowerLimiter;
+
+    BatteryConfig Battery;
+
+    struct {
+        bool Enabled;
+        bool VerboseLogging;
+        uint32_t CAN_Controller_Frequency;
+        bool Auto_Power_Enabled;
+        bool Auto_Power_BatterySoC_Limits_Enabled;
+        bool Emergency_Charge_Enabled;
+        float Auto_Power_Voltage_Limit;
+        float Auto_Power_Enable_Voltage_Limit;
+        float Auto_Power_Lower_Power_Limit;
+        float Auto_Power_Upper_Power_Limit;
+        uint8_t Auto_Power_Stop_BatterySoC_Threshold;
+        float Auto_Power_Target_Power_Consumption;
+    } Huawei;
+
+
     INVERTER_CONFIG_T Inverter[INV_MAX_COUNT];
     char Dev_PinMapping[DEV_MAX_MAPPING_NAME_STRLEN + 1];
 };
@@ -187,6 +369,22 @@ public:
     INVERTER_CONFIG_T* getInverterConfig(const uint64_t serial);
     void deleteInverterById(const uint8_t id);
 
+    static void serializeHttpRequestConfig(HttpRequestConfig const& source, JsonObject& target);
+    static void serializePowerMeterMqttConfig(PowerMeterMqttConfig const& source, JsonObject& target);
+    static void serializePowerMeterSerialSdmConfig(PowerMeterSerialSdmConfig const& source, JsonObject& target);
+    static void serializePowerMeterHttpJsonConfig(PowerMeterHttpJsonConfig const& source, JsonObject& target);
+    static void serializePowerMeterHttpSmlConfig(PowerMeterHttpSmlConfig const& source, JsonObject& target);
+    static void serializeBatteryConfig(BatteryConfig const& source, JsonObject& target);
+    static void serializePowerLimiterConfig(PowerLimiterConfig const& source, JsonObject& target);
+
+    static void deserializeHttpRequestConfig(JsonObject const& source, HttpRequestConfig& target);
+    static void deserializePowerMeterMqttConfig(JsonObject const& source, PowerMeterMqttConfig& target);
+    static void deserializePowerMeterSerialSdmConfig(JsonObject const& source, PowerMeterSerialSdmConfig& target);
+    static void deserializePowerMeterHttpJsonConfig(JsonObject const& source, PowerMeterHttpJsonConfig& target);
+    static void deserializePowerMeterHttpSmlConfig(JsonObject const& source, PowerMeterHttpSmlConfig& target);
+    static void deserializeBatteryConfig(JsonObject const& source, BatteryConfig& target);
+    static void deserializePowerLimiterConfig(JsonObject const& source, PowerLimiterConfig& target);
+
 private:
     void loop();
 

include/DataPoints.h

@@ -0,0 +1,119 @@
+#pragma once
+
+#include <Arduino.h>
+#include <map>
+#include <optional>
+#include <string>
+#include <unordered_map>
+#include <variant>
+
+using tCellVoltages = std::map<uint8_t, uint16_t>;
+
+template<typename... V>
+class DataPoint {
+    template<typename, typename L, template<L> class>
+    friend class DataPointContainer;
+
+    public:
+        using tValue = std::variant<V...>;
+
+        DataPoint() = delete;
+
+        DataPoint(DataPoint const& other)
+            : _strLabel(other._strLabel)
+            , _strValue(other._strValue)
+            , _strUnit(other._strUnit)
+            , _value(other._value)
+            , _timestamp(other._timestamp) { }
+
+        DataPoint(std::string const& strLabel, std::string const& strValue,
+                std::string const& strUnit, tValue value, uint32_t timestamp)
+            : _strLabel(strLabel)
+            , _strValue(strValue)
+            , _strUnit(strUnit)
+            , _value(std::move(value))
+            , _timestamp(timestamp) { }
+
+        std::string const& getLabelText() const { return _strLabel; }
+        std::string const& getValueText() const { return _strValue; }
+        std::string const& getUnitText() const { return _strUnit; }
+        uint32_t getTimestamp() const { return _timestamp; }
+
+        bool operator==(DataPoint const& other) const {
+            return _value == other._value;
+        }
+
+    private:
+        std::string _strLabel;
+        std::string _strValue;
+        std::string _strUnit;
+        tValue _value;
+        uint32_t _timestamp;
+};
+
+template<typename T> std::string dataPointValueToStr(T const& v);
+
+template<typename DataPoint, typename Label, template<Label> class Traits>
+class DataPointContainer {
+    public:
+        DataPointContainer() = default;
+
+        //template<Label L> using Traits = LabelTraits<L>;
+
+        template<Label L>
+        void add(typename Traits<L>::type val) {
+            _dataPoints.emplace(
+                    L,
+                    DataPoint(
+                        Traits<L>::name,
+                        dataPointValueToStr(val),
+                        Traits<L>::unit,
+                        typename DataPoint::tValue(std::move(val)),
+                        millis()
+                    )
+            );
+        }
+
+        // make sure add() is only called with the type expected for the
+        // respective label, no implicit conversions allowed.
+        template<Label L, typename T>
+        void add(T) = delete;
+
+        template<Label L>
+        std::optional<DataPoint const> getDataPointFor() const {
+            auto it = _dataPoints.find(L);
+            if (it == _dataPoints.end()) { return std::nullopt; }
+            return it->second;
+        }
+
+        template<Label L>
+        std::optional<typename Traits<L>::type> get() const {
+            auto optionalDataPoint = getDataPointFor<L>();
+            if (!optionalDataPoint.has_value()) { return std::nullopt; }
+            return std::get<typename Traits<L>::type>(optionalDataPoint->_value);
+        }
+
+        using tMap = std::unordered_map<Label, DataPoint const>;
+        typename tMap::const_iterator cbegin() const { return _dataPoints.cbegin(); }
+        typename tMap::const_iterator cend() const { return _dataPoints.cend(); }
+
+        // copy all data points from source into this instance, overwriting
+        // existing data points in this instance.
+        void updateFrom(DataPointContainer const& source)
+        {
+            for (auto iter = source.cbegin(); iter != source.cend(); ++iter) {
+                auto pos = _dataPoints.find(iter->first);
+
+                if (pos != _dataPoints.end()) {
+                    // do not update existing data points with the same value
+                    if (pos->second == iter->second) { continue; }
+
+                    _dataPoints.erase(pos);
+                }
+                _dataPoints.insert(*iter);
+            }
+        }
+
+    private:
+        tMap _dataPoints;
+};

include/Display_Graphic.h

@@ -80,6 +80,8 @@ private:
     String _i18n_date_format;
     String _i18n_current_power_kw;
     String _i18n_current_power_w;
+    String _i18n_meter_power_w;
+    String _i18n_meter_power_kw;
     String _i18n_yield_total_mwh;
     String _i18n_yield_total_kwh;
 };

include/HttpGetter.h

@@ -0,0 +1,90 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#pragma once
+
+#include "Configuration.h"
+#include <memory>
+#include <vector>
+#include <utility>
+#include <string>
+#include <HTTPClient.h>
+#include <WiFiClient.h>
+
+class HttpGetterClient : public HTTPClient {
+public:
+    void restartTCP() {
+        // keeps the NetworkClient, and closes the TCP connections (as we
+        // effectively do not support keep-alive with HTTP 1.0).
+        HTTPClient::disconnect(true);
+        HTTPClient::connect();
+    }
+};
+
+using up_http_client_t = std::unique_ptr<HttpGetterClient>;
+using sp_wifi_client_t = std::shared_ptr<WiFiClient>;
+
+class HttpRequestResult {
+public:
+    HttpRequestResult(bool success,
+            up_http_client_t upHttpClient = nullptr,
+            sp_wifi_client_t spWiFiClient = nullptr)
+        : _success(success)
+        , _upHttpClient(std::move(upHttpClient))
+        , _spWiFiClient(std::move(spWiFiClient)) { }
+
+    ~HttpRequestResult() {
+        // the wifi client *must* die *after* the http client, as the http
+        // client uses the wifi client in its destructor.
+        if (_upHttpClient) { _upHttpClient->end(); }
+        _upHttpClient = nullptr;
+        _spWiFiClient = nullptr;
+    }
+
+    HttpRequestResult(HttpRequestResult const&) = delete;
+    HttpRequestResult(HttpRequestResult&&) = delete;
+    HttpRequestResult& operator=(HttpRequestResult const&) = delete;
+    HttpRequestResult& operator=(HttpRequestResult&&) = delete;
+
+    operator bool() const { return _success; }
+
+    Stream* getStream() {
+        if(!_upHttpClient) { return nullptr; }
+        return _upHttpClient->getStreamPtr();
+    }
+
+private:
+    bool _success;
+    up_http_client_t _upHttpClient;
+    sp_wifi_client_t _spWiFiClient;
+};
+
+class HttpGetter {
+public:
+    explicit HttpGetter(HttpRequestConfig const& cfg)
+        : _config(cfg) { }
+
+    bool init();
+    void addHeader(char const* key, char const* value);
+    HttpRequestResult performGetRequest();
+
+    char const* getErrorText() const { return _errBuffer; }
+
+private:
+    std::pair<bool, String> getAuthDigest();
+    HttpRequestConfig const& _config;
+
+    template<typename... Args>
+    void logError(char const* format, Args... args);
+    char _errBuffer[256];
+
+    bool _useHttps;
+    String _host;
+    String _uri;
+    uint16_t _port;
+
+    String _wwwAuthenticate = "";
+    unsigned _nonceCounter = 0;
+
+    sp_wifi_client_t _spWiFiClient; // reused for multiple HTTP requests
+
+    std::vector<std::pair<std::string, std::string>> _additionalHeaders;
+};

include/Huawei_can.h

@@ -0,0 +1,158 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#pragma once
+
+#include <cstdint>
+#include "SPI.h"
+#include <mcp_can.h>
+#include <mutex>
+#include <TaskSchedulerDeclarations.h>
+
+#ifndef HUAWEI_PIN_MISO
+#define HUAWEI_PIN_MISO 12
+#endif
+
+#ifndef HUAWEI_PIN_MOSI
+#define HUAWEI_PIN_MOSI 13
+#endif
+
+#ifndef HUAWEI_PIN_SCLK
+#define HUAWEI_PIN_SCLK 26
+#endif
+
+#ifndef HUAWEI_PIN_IRQ
+#define HUAWEI_PIN_IRQ 25
+#endif
+
+#ifndef HUAWEI_PIN_CS
+#define HUAWEI_PIN_CS 15
+#endif
+
+#ifndef HUAWEI_PIN_POWER
+#define HUAWEI_PIN_POWER 33
+#endif
+
+#define HUAWEI_MINIMAL_OFFLINE_VOLTAGE 48
+#define HUAWEI_MINIMAL_ONLINE_VOLTAGE 42
+
+#define MAX_CURRENT_MULTIPLIER 20
+
+// Index values for rec_values array
+#define HUAWEI_INPUT_POWER_IDX 0
+#define HUAWEI_INPUT_FREQ_IDX 1
+#define HUAWEI_INPUT_CURRENT_IDX 2
+#define HUAWEI_OUTPUT_POWER_IDX 3
+#define HUAWEI_EFFICIENCY_IDX 4
+#define HUAWEI_OUTPUT_VOLTAGE_IDX 5
+#define HUAWEI_OUTPUT_CURRENT_MAX_IDX 6
+#define HUAWEI_INPUT_VOLTAGE_IDX 7
+#define HUAWEI_OUTPUT_TEMPERATURE_IDX 8
+#define HUAWEI_INPUT_TEMPERATURE_IDX 9
+#define HUAWEI_OUTPUT_CURRENT_IDX 10
+#define HUAWEI_OUTPUT_CURRENT1_IDX 11
+
+// Defines and index values for tx_values array
+#define HUAWEI_OFFLINE_VOLTAGE 0x01
+#define HUAWEI_ONLINE_VOLTAGE 0x00
+#define HUAWEI_OFFLINE_CURRENT 0x04
+#define HUAWEI_ONLINE_CURRENT 0x03
+
+// Modes of operation
+#define HUAWEI_MODE_OFF 0
+#define HUAWEI_MODE_ON 1
+#define HUAWEI_MODE_AUTO_EXT 2
+#define HUAWEI_MODE_AUTO_INT 3
+
+// Error codes
+#define HUAWEI_ERROR_CODE_RX 0x01
+#define HUAWEI_ERROR_CODE_TX 0x02
+
+// Wait time/current before shuting down the PSU / charger
+// This is set to allow the fan to run for some time
+#define HUAWEI_AUTO_MODE_SHUTDOWN_DELAY 60000
+#define HUAWEI_AUTO_MODE_SHUTDOWN_CURRENT 0.75
+
+// Updateinterval used to request new values from the PSU
+#define HUAWEI_DATA_REQUEST_INTERVAL_MS 2500
+
+typedef struct RectifierParameters {
+    float input_voltage;
+    float input_frequency;
+    float input_current;
+    float input_power;
+    float input_temp;
+    float efficiency;
+    float output_voltage;
+    float output_current;
+    float max_output_current;
+    float output_power;
+    float output_temp;
+    float amp_hour;
+} RectifierParameters_t;
+
+class HuaweiCanCommClass {
+public:
+    bool init(uint8_t huawei_miso, uint8_t huawei_mosi, uint8_t huawei_clk,
+            uint8_t huawei_irq, uint8_t huawei_cs, uint32_t frequency);
+    void loop();
+    bool gotNewRxDataFrame(bool clear);
+    uint8_t  getErrorCode(bool clear);
+    uint32_t getParameterValue(uint8_t parameter);
+    void setParameterValue(uint16_t in, uint8_t parameterType);
+
+private:
+    void sendRequest();
+
+    SPIClass *SPI;
+    MCP_CAN  *_CAN;
+    uint8_t  _huaweiIrq;                         // IRQ pin
+    uint32_t _nextRequestMillis = 0;              // When to send next data request to PSU
+
+    std::mutex _mutex;
+
+    uint32_t _recValues[12];
+    uint16_t _txValues[5];
+    bool     _hasNewTxValue[5];
+
+    uint8_t _errorCode;
+    bool _completeUpdateReceived;
+};
+
+class HuaweiCanClass {
+public:
+    void init(Scheduler& scheduler, uint8_t huawei_miso, uint8_t huawei_mosi, uint8_t huawei_clk, uint8_t huawei_irq, uint8_t huawei_cs, uint8_t huawei_power);
+    void updateSettings(uint8_t huawei_miso, uint8_t huawei_mosi, uint8_t huawei_clk, uint8_t huawei_irq, uint8_t huawei_cs, uint8_t huawei_power);
+    void setValue(float in, uint8_t parameterType);
+    void setMode(uint8_t mode);
+
+    RectifierParameters_t * get();
+    uint32_t getLastUpdate() const { return _lastUpdateReceivedMillis; };
+    bool getAutoPowerStatus() const { return _autoPowerEnabled; };
+    uint8_t getMode() const { return _mode; };
+
+private:
+    void loop();
+    void processReceivedParameters();
+    void _setValue(float in, uint8_t parameterType);
+
+    Task _loopTask;
+
+    TaskHandle_t _HuaweiCanCommunicationTaskHdl = NULL;
+    bool    _initialized = false;
+    uint8_t _huaweiPower;           // Power pin
+    uint8_t _mode = HUAWEI_MODE_AUTO_EXT;
+
+    RectifierParameters_t _rp;
+
+    uint32_t _lastUpdateReceivedMillis;           // Timestamp for last data seen from the PSU
+    uint32_t _outputCurrentOnSinceMillis;         // Timestamp since when the PSU was idle at zero amps
+    uint32_t _nextAutoModePeriodicIntMillis;      // When to set the next output voltage in automatic mode
+    uint32_t _lastPowerMeterUpdateReceivedMillis; // Timestamp of last seen power meter value
+    uint32_t _autoModeBlockedTillMillis = 0;      // Timestamp to block running auto mode for some time
+
+    uint8_t _autoPowerEnabledCounter = 0;
+    bool _autoPowerEnabled = false;
+    bool _batteryEmergencyCharging = false;
+};
+
+extern HuaweiCanClass HuaweiCan;
+extern HuaweiCanCommClass HuaweiCanComm;

include/I18n.h

@@ -22,6 +22,7 @@ public:
         String& date_format,
         String& offline,
         String& power_w, String& power_kw,
+        String& meter_power_w, String& meter_power_kw,
         String& yield_today_wh, String& yield_today_kwh,
         String& yield_total_kwh, String& yield_total_mwh);
 

include/JbdBmsController.h

@@ -0,0 +1,87 @@
+#pragma once
+
+#include <memory>
+#include <vector>
+#include <frozen/string.h>
+
+#include "Battery.h"
+#include "JbdBmsDataPoints.h"
+#include "JbdBmsSerialMessage.h"
+#include "JbdBmsController.h"
+
+namespace JbdBms {
+
+class Controller : public BatteryProvider {
+    public:
+        Controller() = default;
+
+        bool init(bool verboseLogging) final;
+        void deinit() final;
+        void loop() final;
+        std::shared_ptr<BatteryStats> getStats() const final { return _stats; }
+
+    private:
+        static char constexpr _serialPortOwner[] = "JBD BMS";
+
+#ifdef JBDBMS_DUMMY_SERIAL
+        std::unique_ptr<DummySerial> _upSerial;
+#else
+        std::unique_ptr<HardwareSerial> _upSerial;
+#endif
+
+        enum class Status : unsigned {
+            Initializing,
+            Timeout,
+            WaitingForPollInterval,
+            HwSerialNotAvailableForWrite,
+            BusyReading,
+            RequestSent,
+            FrameCompleted
+        };
+
+        frozen::string const& getStatusText(Status status);
+        void announceStatus(Status status);
+        void sendRequest(uint8_t pollInterval);
+        void rxData(uint8_t inbyte);
+        void reset();
+        void frameComplete();
+        void processDataPoints(DataPointContainer const& dataPoints);
+
+        enum class Interface : unsigned {
+            Invalid,
+            Uart,
+            Transceiver
+        };
+
+        Interface getInterface() const;
+
+        enum class ReadState : unsigned {
+            Idle,
+            WaitingForFrameStart,
+            FrameStartReceived, // 1 Byte: 0xDD
+            StateReceived,
+            CommandCodeReceived,
+            ReadingDataContent,
+            DataContentReceived,
+            ReadingCheckSum,
+            CheckSumReceived,
+        };
+
+        ReadState _readState;
+        void setReadState(ReadState state) {
+            _readState = state;
+        }
+
+        bool _verboseLogging = true;
+        int8_t _rxEnablePin = -1;
+        int8_t _txEnablePin = -1;
+        Status _lastStatus = Status::Initializing;
+        uint32_t _lastStatusPrinted = 0;
+        uint32_t _lastRequest = 0;
+        uint8_t _dataLength = 0;
+        JbdBms::SerialResponse::tData _buffer = {};
+        std::shared_ptr<JbdBmsBatteryStats> _stats =
+            std::make_shared<JbdBmsBatteryStats>();
+};
+
+} /* namespace JbdBms */

include/JbdBmsDataPoints.h

@@ -0,0 +1,118 @@
+#pragma once
+
+#include <Arduino.h>
+#include <map>
+#include <frozen/map.h>
+#include <frozen/string.h>
+
+#include "DataPoints.h"
+
+namespace JbdBms {
+
+#define JBD_PROTECTION_STATUS(fnc) \
+    fnc(CellOverVoltage, (1<<0)) \
+    fnc(CellUnderVoltage, (1<<1)) \
+    fnc(PackOverVoltage, (1<<2)) \
+    fnc(PackUnderVoltage, (1<<3)) \
+    fnc(ChargingOverTemperature, (1<<4)) \
+    fnc(ChargingLowTemperature, (1<<5)) \
+    fnc(DischargingOverTemperature, (1<<6)) \
+    fnc(DischargingLowTemperature, (1<<7)) \
+    fnc(ChargingOverCurrent, (1<<8)) \
+    fnc(DischargeOverCurrent, (1<<9)) \
+    fnc(ShortCircuit, (1<<10)) \
+    fnc(IcFrontEndError, (1<<11)) \
+    fnc(MosSotwareLock, (1<<12)) \
+    fnc(Reserved1, (1<<13)) \
+    fnc(Reserved2, (1<<14)) \
+    fnc(Reserved3, (1<<15))
+
+enum class AlarmBits : uint16_t {
+#define ALARM_ENUM(name, value) name = value,
+    JBD_PROTECTION_STATUS(ALARM_ENUM)
+#undef ALARM_ENUM
+};
+
+static const frozen::map<AlarmBits, frozen::string, 16> AlarmBitTexts = {
+#define ALARM_TEXT(name, value) { AlarmBits::name, #name },
+    JBD_PROTECTION_STATUS(ALARM_TEXT)
+#undef ALARM_TEXT
+};
+
+enum class DataPointLabel : uint8_t {
+    CellsMilliVolt,
+    BatteryTempOneCelsius,
+    BatteryTempTwoCelsius,
+    BatteryVoltageMilliVolt,
+    BatteryCurrentMilliAmps,
+    BatterySoCPercent,
+    BatteryTemperatureSensorAmount,
+    BatteryCycles,
+    BatteryCellAmount,
+    AlarmsBitmask,
+    BalancingEnabled,
+    CellAmountSetting,
+    BatteryCapacitySettingAmpHours,
+    BatteryChargeEnabled,
+    BatteryDischargeEnabled,
+    DateOfManufacturing,
+    BmsSoftwareVersion,
+    BmsHardwareVersion,
+    ActualBatteryCapacityAmpHours
+};
+
+using tCells = tCellVoltages;
+
+template<DataPointLabel> struct DataPointLabelTraits;
+
+#define LABEL_TRAIT(n, t, u) template<> struct DataPointLabelTraits<DataPointLabel::n> { \
+    using type = t; \
+    static constexpr char const name[] = #n; \
+    static constexpr char const unit[] = u; \
+};
+
+/**
+ * the types associated with the labels are the types for the respective data
+ * points in the JbdBms::DataPoint class. they are *not* always equal to the
+ * type used in the serial message.
+ *
+ * it is unfortunate that we have to repeat all enum values here to define the
+ * traits. code generation could help here (labels are defined in a single
+ * source of truth and this code is generated -- no typing errors, etc.).
+ * however, the compiler will complain if an enum is misspelled or traits are
+ * defined for a removed enum, so we will notice. it will also complain when a
+ * trait is missing and if a data point for a label without traits is added to
+ * the DataPointContainer class, because the traits must be available then.
+ * even though this is tedious to maintain, human errors will be caught.
+ */
+LABEL_TRAIT(CellsMilliVolt,                         tCells,      "mV");
+LABEL_TRAIT(BatteryTempOneCelsius,                  int16_t,     "°C");
+LABEL_TRAIT(BatteryTempTwoCelsius,                  int16_t,     "°C");
+LABEL_TRAIT(BatteryVoltageMilliVolt,                uint32_t,    "mV");
+LABEL_TRAIT(BatteryCurrentMilliAmps,                int32_t,     "mA");
+LABEL_TRAIT(BatterySoCPercent,                      uint8_t,     "%");
+LABEL_TRAIT(BatteryTemperatureSensorAmount,         uint8_t,     "");
+LABEL_TRAIT(BatteryCycles,                          uint16_t,    "");
+LABEL_TRAIT(BatteryCellAmount,                      uint16_t,    "");
+LABEL_TRAIT(AlarmsBitmask,                          uint16_t,    "");
+LABEL_TRAIT(BalancingEnabled,                       bool,        "");
+LABEL_TRAIT(CellAmountSetting,                      uint8_t,     "");
+LABEL_TRAIT(BatteryCapacitySettingAmpHours,         uint32_t,    "Ah");
+LABEL_TRAIT(BatteryChargeEnabled,                   bool,        "");
+LABEL_TRAIT(BatteryDischargeEnabled,                bool,        "");
+LABEL_TRAIT(DateOfManufacturing,                    std::string, "");
+LABEL_TRAIT(BmsSoftwareVersion,                     std::string, "");
+LABEL_TRAIT(BmsHardwareVersion,                     std::string, "");
+LABEL_TRAIT(ActualBatteryCapacityAmpHours,          uint32_t,    "Ah");
+#undef LABEL_TRAIT
+
+} /* namespace JbdBms */
+
+using JbdBmsDataPoint = DataPoint<bool, uint8_t, uint16_t, uint32_t,
+              int16_t, int32_t, std::string, JbdBms::tCells>;
+
+template class DataPointContainer<JbdBmsDataPoint, JbdBms::DataPointLabel, JbdBms::DataPointLabelTraits>;
+
+namespace JbdBms {
+    using DataPointContainer = DataPointContainer<JbdBmsDataPoint, DataPointLabel, DataPointLabelTraits>;
+} /* namespace JbdBms */

include/JbdBmsSerialMessage.h

@@ -0,0 +1,96 @@
+#pragma once
+
+#include <utility>
+#include <vector>
+#include <Arduino.h>
+
+#include "JbdBmsDataPoints.h"
+
+namespace JbdBms {
+
+// Only valid for receiving messages
+class SerialMessage {
+    public:
+        using tData = std::vector<uint8_t>;
+
+        SerialMessage() = delete;
+
+        enum class Command : uint8_t {
+            Init = 0x00,
+            ReadBasicInformation = 0x03,
+            ReadCellVoltages = 0x04,
+            ReadHardwareVersionNumber = 0x05,
+            ControlMosInstruction = 0xE1,
+        };
+
+        uint8_t getStartMarker() const { return _raw[0]; }
+        virtual Command getCommand() const = 0;
+        uint8_t getDataLength() const { return _raw[3]; }
+        uint16_t getChecksum() const { return get<uint16_t>(_raw.cend()-3); }
+        uint8_t getEndMarker() const { return *(_raw.cend()-1); }
+        void printMessage();
+
+        bool isValid() const;
+
+        uint8_t const* data() { return _raw.data(); }
+        size_t size() { return _raw.size(); }
+
+        static constexpr uint8_t startMarker = 0xDD;
+        static constexpr uint8_t endMarker = 0x77;
+
+    protected:
+        template <typename... Args>
+        explicit SerialMessage(Args&&... args) : _raw(std::forward<Args>(args)...) { }
+
+        template<typename T, typename It> T get(It&& pos) const;
+        template<typename It> bool getBool(It&& pos) const;
+        template<typename It> int16_t getTemperature(It&& pos) const;
+        template<typename It> std::string getString(It&& pos, size_t len, bool replaceZeroes = false) const;
+        template<typename It> std::string getProductionDate(It&& pos) const;
+        template<typename T> void set(tData::iterator const& pos, T val);
+        uint16_t calcChecksum() const;
+        void updateChecksum();
+
+        tData _raw;
+        JbdBms::DataPointContainer _dp;
+};
+
+class SerialResponse : public SerialMessage {
+    public:
+        enum class Status : uint8_t {
+            Ok = 0x00,
+            Error = 0x80
+        };
+
+        using tData = SerialMessage::tData;
+        explicit SerialResponse(tData&& raw);
+
+        Command getCommand() const { return static_cast<Command>(_raw[1]); }
+        Status getStatus() const { return static_cast<Status>(_raw[2]); }
+
+        bool isValid() const;
+
+        DataPointContainer const& getDataPoints() const { return _dp; }
+};
+
+class SerialCommand : public SerialMessage {
+    public:
+        enum class Status : uint8_t {
+            Read = 0xA5,
+            Write = 0x5A,
+        };
+
+        explicit SerialCommand(Status status, Command cmd);
+
+        Status getStatus() const { return static_cast<Status>(_raw[1]); }
+        Command getCommand() const { return static_cast<Command>(_raw[2]); }
+        static Command getLastCommand() { return _lastCmd; }
+
+        bool isValid() const;
+
+    private:
+        static Command _lastCmd;
+};
+
+
+} /* namespace JbdBms */

include/JkBmsController.h

@@ -0,0 +1,86 @@
+#pragma once
+
+#include <memory>
+#include <vector>
+#include <frozen/string.h>
+
+#include "Battery.h"
+#include "JkBmsDataPoints.h"
+#include "JkBmsSerialMessage.h"
+#include "JkBmsDummy.h"
+
+//#define JKBMS_DUMMY_SERIAL
+
+namespace JkBms {
+
+class Controller : public BatteryProvider {
+    public:
+        Controller() = default;
+
+        bool init(bool verboseLogging) final;
+        void deinit() final;
+        void loop() final;
+        std::shared_ptr<BatteryStats> getStats() const final { return _stats; }
+
+    private:
+        static char constexpr _serialPortOwner[] = "JK BMS";
+
+#ifdef JKBMS_DUMMY_SERIAL
+        std::unique_ptr<DummySerial> _upSerial;
+#else
+        std::unique_ptr<HardwareSerial> _upSerial;
+#endif
+
+        enum class Status : unsigned {
+            Initializing,
+            Timeout,
+            WaitingForPollInterval,
+            HwSerialNotAvailableForWrite,
+            BusyReading,
+            RequestSent,
+            FrameCompleted
+        };
+
+        frozen::string const& getStatusText(Status status);
+        void announceStatus(Status status);
+        void sendRequest(uint8_t pollInterval);
+        void rxData(uint8_t inbyte);
+        void reset();
+        void frameComplete();
+        void processDataPoints(DataPointContainer const& dataPoints);
+
+        enum class Interface : unsigned {
+            Invalid,
+            Uart,
+            Transceiver
+        };
+
+        Interface getInterface() const;
+
+        enum class ReadState : unsigned {
+            Idle,
+            WaitingForFrameStart,
+            FrameStartReceived,
+            StartMarkerReceived,
+            FrameLengthMsbReceived,
+            ReadingFrame
+        };
+        ReadState _readState;
+        void setReadState(ReadState state) {
+            _readState = state;
+        }
+
+        bool _verboseLogging = true;
+        int8_t _rxEnablePin = -1;
+        int8_t _txEnablePin = -1;
+        Status _lastStatus = Status::Initializing;
+        uint32_t _lastStatusPrinted = 0;
+        uint32_t _lastRequest = 0;
+        uint16_t _frameLength = 0;
+        uint8_t _protocolVersion = -1;
+        SerialResponse::tData _buffer = {};
+        std::shared_ptr<JkBmsBatteryStats> _stats =
+            std::make_shared<JkBmsBatteryStats>();
+};
+
+} /* namespace JkBms */

include/JkBmsDataPoints.h

@@ -0,0 +1,216 @@
+#pragma once
+
+#include <Arduino.h>
+#include <map>
+#include <frozen/map.h>
+#include <frozen/string.h>
+
+#include "DataPoints.h"
+
+namespace JkBms {
+
+#define ALARM_BITS(fnc) \
+    fnc(LowCapacity, (1<<0)) \
+    fnc(BmsOvertemperature, (1<<1)) \
+    fnc(ChargingOvervoltage, (1<<2)) \
+    fnc(DischargeUndervoltage, (1<<3)) \
+    fnc(BatteryOvertemperature, (1<<4)) \
+    fnc(ChargingOvercurrent, (1<<5)) \
+    fnc(DischargeOvercurrent, (1<<6)) \
+    fnc(CellVoltageDifference, (1<<7)) \
+    fnc(BatteryBoxOvertemperature, (1<<8)) \
+    fnc(BatteryUndertemperature, (1<<9)) \
+    fnc(CellOvervoltage, (1<<10)) \
+    fnc(CellUndervoltage, (1<<11)) \
+    fnc(AProtect, (1<<12)) \
+    fnc(BProtect, (1<<13)) \
+    fnc(Reserved1, (1<<14)) \
+    fnc(Reserved2, (1<<15))
+
+enum class AlarmBits : uint16_t {
+#define ALARM_ENUM(name, value) name = value,
+    ALARM_BITS(ALARM_ENUM)
+#undef ALARM_ENUM
+};
+
+static const frozen::map<AlarmBits, frozen::string, 16> AlarmBitTexts = {
+#define ALARM_TEXT(name, value) { AlarmBits::name, #name },
+    ALARM_BITS(ALARM_TEXT)
+#undef ALARM_TEXT
+};
+
+#define STATUS_BITS(fnc) \
+    fnc(ChargingActive, (1<<0)) \
+    fnc(DischargingActive, (1<<1)) \
+    fnc(BalancingActive, (1<<2)) \
+    fnc(BatteryOnline, (1<<3))
+
+enum class StatusBits : uint16_t {
+#define STATUS_ENUM(name, value) name = value,
+    STATUS_BITS(STATUS_ENUM)
+#undef STATUS_ENUM
+};
+
+static const frozen::map<StatusBits, frozen::string, 4> StatusBitTexts = {
+#define STATUS_TEXT(name, value) { StatusBits::name, #name },
+    STATUS_BITS(STATUS_TEXT)
+#undef STATUS_TEXT
+};
+
+enum class DataPointLabel : uint8_t {
+    CellsMilliVolt = 0x79,
+    BmsTempCelsius = 0x80,
+    BatteryTempOneCelsius = 0x81,
+    BatteryTempTwoCelsius = 0x82,
+    BatteryVoltageMilliVolt = 0x83,
+    BatteryCurrentMilliAmps = 0x84,
+    BatterySoCPercent = 0x85,
+    BatteryTemperatureSensorAmount = 0x86,
+    BatteryCycles = 0x87,
+    BatteryCycleCapacity = 0x89,
+    BatteryCellAmount = 0x8a,
+    AlarmsBitmask = 0x8b,
+    StatusBitmask = 0x8c,
+    TotalOvervoltageThresholdMilliVolt = 0x8e,
+    TotalUndervoltageThresholdMilliVolt = 0x8f,
+    CellOvervoltageThresholdMilliVolt = 0x90,
+    CellOvervoltageRecoveryMilliVolt = 0x91,
+    CellOvervoltageProtectionDelaySeconds = 0x92,
+    CellUndervoltageThresholdMilliVolt = 0x93,
+    CellUndervoltageRecoveryMilliVolt = 0x94,
+    CellUndervoltageProtectionDelaySeconds = 0x95,
+    CellVoltageDiffThresholdMilliVolt = 0x96,
+    DischargeOvercurrentThresholdAmperes = 0x97,
+    DischargeOvercurrentDelaySeconds = 0x98,
+    ChargeOvercurrentThresholdAmps = 0x99,
+    ChargeOvercurrentDelaySeconds = 0x9a,
+    BalanceCellVoltageThresholdMilliVolt = 0x9b,
+    BalanceVoltageDiffThresholdMilliVolt = 0x9c,
+    BalancingEnabled = 0x9d,
+    BmsTempProtectionThresholdCelsius = 0x9e,
+    BmsTempRecoveryThresholdCelsius = 0x9f,
+    BatteryTempProtectionThresholdCelsius = 0xa0,
+    BatteryTempRecoveryThresholdCelsius = 0xa1,
+    BatteryTempDiffThresholdCelsius = 0xa2,
+    ChargeHighTempThresholdCelsius = 0xa3,
+    DischargeHighTempThresholdCelsius = 0xa4,
+    ChargeLowTempThresholdCelsius = 0xa5,
+    ChargeLowTempRecoveryCelsius = 0xa6,
+    DischargeLowTempThresholdCelsius = 0xa7,
+    DischargeLowTempRecoveryCelsius = 0xa8,
+    CellAmountSetting = 0xa9,
+    BatteryCapacitySettingAmpHours = 0xaa,
+    BatteryChargeEnabled = 0xab,
+    BatteryDischargeEnabled = 0xac,
+    CurrentCalibrationMilliAmps = 0xad,
+    BmsAddress = 0xae,
+    BatteryType = 0xaf,
+    SleepWaitTime = 0xb0, // what's this?
+    LowCapacityAlarmThresholdPercent = 0xb1,
+    ModificationPassword = 0xb2,
+    DedicatedChargerSwitch = 0xb3, // what's this?
+    EquipmentId = 0xb4,
+    DateOfManufacturing = 0xb5,
+    BmsHourMeterMinutes = 0xb6,
+    BmsSoftwareVersion = 0xb7,
+    CurrentCalibration = 0xb8,
+    ActualBatteryCapacityAmpHours = 0xb9,
+    ProductId = 0xba,
+    ProtocolVersion = 0xc0
+};
+
+using tCells = tCellVoltages;
+
+template<DataPointLabel> struct DataPointLabelTraits;
+
+#define LABEL_TRAIT(n, t, u) template<> struct DataPointLabelTraits<DataPointLabel::n> { \
+    using type = t; \
+    static constexpr char const name[] = #n; \
+    static constexpr char const unit[] = u; \
+};
+
+/**
+ * the types associated with the labels are the types for the respective data
+ * points in the JkBms::DataPoint class. they are *not* always equal to the
+ * type used in the serial message.
+ *
+ * it is unfortunate that we have to repeat all enum values here to define the
+ * traits. code generation could help here (labels are defined in a single
+ * source of truth and this code is generated -- no typing errors, etc.).
+ * however, the compiler will complain if an enum is misspelled or traits are
+ * defined for a removed enum, so we will notice. it will also complain when a
+ * trait is missing and if a data point for a label without traits is added to
+ * the DataPointContainer class, because the traits must be available then.
+ * even though this is tedious to maintain, human errors will be caught.
+ */
+LABEL_TRAIT(CellsMilliVolt,                         tCells,      "mV");
+LABEL_TRAIT(BmsTempCelsius,                         int16_t,     "°C");
+LABEL_TRAIT(BatteryTempOneCelsius,                  int16_t,     "°C");
+LABEL_TRAIT(BatteryTempTwoCelsius,                  int16_t,     "°C");
+LABEL_TRAIT(BatteryVoltageMilliVolt,                uint32_t,    "mV");
+LABEL_TRAIT(BatteryCurrentMilliAmps,                int32_t,     "mA");
+LABEL_TRAIT(BatterySoCPercent,                      uint8_t,     "%");
+LABEL_TRAIT(BatteryTemperatureSensorAmount,         uint8_t,     "");
+LABEL_TRAIT(BatteryCycles,                          uint16_t,    "");
+LABEL_TRAIT(BatteryCycleCapacity,                   uint32_t,    "Ah");
+LABEL_TRAIT(BatteryCellAmount,                      uint16_t,    "");
+LABEL_TRAIT(AlarmsBitmask,                          uint16_t,    "");
+LABEL_TRAIT(StatusBitmask,                          uint16_t,    "");
+LABEL_TRAIT(TotalOvervoltageThresholdMilliVolt,     uint32_t,    "mV");
+LABEL_TRAIT(TotalUndervoltageThresholdMilliVolt,    uint32_t,    "mV");
+LABEL_TRAIT(CellOvervoltageThresholdMilliVolt,      uint16_t,    "mV");
+LABEL_TRAIT(CellOvervoltageRecoveryMilliVolt,       uint16_t,    "mV");
+LABEL_TRAIT(CellOvervoltageProtectionDelaySeconds,  uint16_t,    "s");
+LABEL_TRAIT(CellUndervoltageThresholdMilliVolt,     uint16_t,    "mV");
+LABEL_TRAIT(CellUndervoltageRecoveryMilliVolt,      uint16_t,    "mV");
+LABEL_TRAIT(CellUndervoltageProtectionDelaySeconds, uint16_t,    "s");
+LABEL_TRAIT(CellVoltageDiffThresholdMilliVolt,      uint16_t,    "mV");
+LABEL_TRAIT(DischargeOvercurrentThresholdAmperes,   uint16_t,    "A");
+LABEL_TRAIT(DischargeOvercurrentDelaySeconds,       uint16_t,    "s");
+LABEL_TRAIT(ChargeOvercurrentThresholdAmps,         uint16_t,    "A");
+LABEL_TRAIT(ChargeOvercurrentDelaySeconds,          uint16_t,    "s");
+LABEL_TRAIT(BalanceCellVoltageThresholdMilliVolt,   uint16_t,    "mV");
+LABEL_TRAIT(BalanceVoltageDiffThresholdMilliVolt,   uint16_t,    "mV");
+LABEL_TRAIT(BalancingEnabled,                       bool,        "");
+LABEL_TRAIT(BmsTempProtectionThresholdCelsius,      uint16_t,    "°C");
+LABEL_TRAIT(BmsTempRecoveryThresholdCelsius,        uint16_t,    "°C");
+LABEL_TRAIT(BatteryTempProtectionThresholdCelsius,  uint16_t,    "°C");
+LABEL_TRAIT(BatteryTempRecoveryThresholdCelsius,    uint16_t,    "°C");
+LABEL_TRAIT(BatteryTempDiffThresholdCelsius,        uint16_t,    "°C");
+LABEL_TRAIT(ChargeHighTempThresholdCelsius,         uint16_t,    "°C");
+LABEL_TRAIT(DischargeHighTempThresholdCelsius,      uint16_t,    "°C");
+LABEL_TRAIT(ChargeLowTempThresholdCelsius,          int16_t,     "°C");
+LABEL_TRAIT(ChargeLowTempRecoveryCelsius,           int16_t,     "°C");
+LABEL_TRAIT(DischargeLowTempThresholdCelsius,       int16_t,     "°C");
+LABEL_TRAIT(DischargeLowTempRecoveryCelsius,        int16_t,     "°C");
+LABEL_TRAIT(CellAmountSetting,                      uint8_t,     "");
+LABEL_TRAIT(BatteryCapacitySettingAmpHours,         uint32_t,    "Ah");
+LABEL_TRAIT(BatteryChargeEnabled,                   bool,        "");
+LABEL_TRAIT(BatteryDischargeEnabled,                bool,        "");
+LABEL_TRAIT(CurrentCalibrationMilliAmps,            uint16_t,    "mA");
+LABEL_TRAIT(BmsAddress,                             uint8_t,     "");
+LABEL_TRAIT(BatteryType,                            uint8_t,     "");
+LABEL_TRAIT(SleepWaitTime,                          uint16_t,    "s");
+LABEL_TRAIT(LowCapacityAlarmThresholdPercent,       uint8_t,     "%");
+LABEL_TRAIT(ModificationPassword,                   std::string, "");
+LABEL_TRAIT(DedicatedChargerSwitch,                 bool,        "");
+LABEL_TRAIT(EquipmentId,                            std::string, "");
+LABEL_TRAIT(DateOfManufacturing,                    std::string, "");
+LABEL_TRAIT(BmsHourMeterMinutes,                    uint32_t,    "min");
+LABEL_TRAIT(BmsSoftwareVersion,                     std::string, "");
+LABEL_TRAIT(CurrentCalibration,                     bool,        "");
+LABEL_TRAIT(ActualBatteryCapacityAmpHours,          uint32_t,    "Ah");
+LABEL_TRAIT(ProductId,                              std::string, "");
+LABEL_TRAIT(ProtocolVersion,                        uint8_t,     "");
+#undef LABEL_TRAIT
+
+} /* namespace JkBms */
+
+using JkBmsDataPoint = DataPoint<bool, uint8_t, uint16_t, uint32_t,
+              int16_t, int32_t, std::string, JkBms::tCells>;
+
+template class DataPointContainer<JkBmsDataPoint, JkBms::DataPointLabel, JkBms::DataPointLabelTraits>;
+
+namespace JkBms {
+    using DataPointContainer = DataPointContainer<JkBmsDataPoint, DataPointLabel, DataPointLabelTraits>;
+} /* namespace JkBms */

include/JkBmsDummy.h

@@ -0,0 +1,196 @@
+#pragma once
+
+#include <Arduino.h>
+#include <vector>
+#include "MessageOutput.h"
+
+namespace JkBms {
+
+class DummySerial {
+    public:
+        DummySerial() = default;
+        void begin(uint32_t, uint32_t, int8_t, int8_t) {
+            MessageOutput.println("JK BMS Dummy Serial: begin()");
+        }
+        void end() { MessageOutput.println("JK BMS Dummy Serial: end()"); }
+        void flush() { }
+        bool availableForWrite() const { return true; }
+        size_t write(const uint8_t *buffer, size_t size) {
+            MessageOutput.printf("JK BMS Dummy Serial: write(%d Bytes)\r\n", size);
+            _byte_idx = 0;
+            _msg_idx = (_msg_idx + 1) % _data.size();
+            return size;
+        }
+        bool available() const {
+            return _byte_idx < _data[_msg_idx].size();
+        }
+        int read() {
+            if (_byte_idx >= _data[_msg_idx].size()) { return 0; }
+            return _data[_msg_idx][_byte_idx++];
+        }
+
+    private:
+        std::vector<std::vector<uint8_t>> const _data =
+        {
+            {
+                0x4e, 0x57, 0x01, 0x21, 0x00, 0x00, 0x00, 0x00,
+                0x06, 0x00, 0x01, 0x79, 0x30, 0x01, 0x0c, 0xfb,
+                0x02, 0x0c, 0xfb, 0x03, 0x0c, 0xfb, 0x04, 0x0c,
+                0xfb, 0x05, 0x0c, 0xfb, 0x06, 0x0c, 0xfb, 0x07,
+                0x0c, 0xfb, 0x08, 0x0c, 0xf7, 0x09, 0x0d, 0x01,
+                0x0a, 0x0c, 0xf9, 0x0b, 0x0c, 0xfb, 0x0c, 0x0c,
+                0xfb, 0x0d, 0x0c, 0xfb, 0x0e, 0x0c, 0xf8, 0x0f,
+                0x0c, 0xf9, 0x10, 0x0c, 0xfb, 0x80, 0x00, 0x1a,
+                0x81, 0x00, 0x12, 0x82, 0x00, 0x12, 0x83, 0x14,
+                0xc3, 0x84, 0x83, 0xf4, 0x85, 0x2e, 0x86, 0x02,
+                0x87, 0x00, 0x15, 0x89, 0x00, 0x00, 0x13, 0x52,
+                0x8a, 0x00, 0x10, 0x8b, 0x00, 0x00, 0x8c, 0x00,
+                0x03, 0x8e, 0x16, 0x80, 0x8f, 0x12, 0xc0, 0x90,
+                0x0e, 0x10, 0x91, 0x0c, 0xda, 0x92, 0x00, 0x05,
+                0x93, 0x0b, 0xb8, 0x94, 0x0c, 0x80, 0x95, 0x00,
+                0x05, 0x96, 0x01, 0x2c, 0x97, 0x00, 0x28, 0x98,
+                0x01, 0x2c, 0x99, 0x00, 0x28, 0x9a, 0x00, 0x1e,
+                0x9b, 0x0b, 0xb8, 0x9c, 0x00, 0x0a, 0x9d, 0x01,
+                0x9e, 0x00, 0x64, 0x9f, 0x00, 0x50, 0xa0, 0x00,
+                0x64, 0xa1, 0x00, 0x64, 0xa2, 0x00, 0x14, 0xa3,
+                0x00, 0x46, 0xa4, 0x00, 0x46, 0xa5, 0x00, 0x00,
+                0xa6, 0x00, 0x02, 0xa7, 0xff, 0xec, 0xa8, 0xff,
+                0xf6, 0xa9, 0x10, 0xaa, 0x00, 0x00, 0x00, 0xe6,
+                0xab, 0x01, 0xac, 0x01, 0xad, 0x04, 0x4d, 0xae,
+                0x01, 0xaf, 0x00, 0xb0, 0x00, 0x0a, 0xb1, 0x14,
+                0xb2, 0x32, 0x32, 0x31, 0x31, 0x38, 0x37, 0x00,
+                0x00, 0x00, 0x00, 0xb3, 0x00, 0xb4, 0x62, 0x65,
+                0x6b, 0x69, 0x00, 0x00, 0x00, 0x00, 0xb5, 0x32,
+                0x33, 0x30, 0x36, 0xb6, 0x00, 0x01, 0x4a, 0xc3,
+                0xb7, 0x31, 0x31, 0x2e, 0x58, 0x57, 0x5f, 0x53,
+                0x31, 0x31, 0x2e, 0x32, 0x36, 0x32, 0x48, 0x5f,
+                0xb8, 0x00, 0xb9, 0x00, 0x00, 0x00, 0xe6, 0xba,
+                0x62, 0x65, 0x6b, 0x69, 0x00, 0x00, 0x00, 0x00,
+                0x00, 0x00, 0x00, 0x00, 0x4a, 0x4b, 0x5f, 0x42,
+                0x31, 0x41, 0x32, 0x34, 0x53, 0x31, 0x35, 0x50,
+                0xc0, 0x01, 0x00, 0x00, 0x00, 0x00, 0x68, 0x00,
+                0x00, 0x53, 0xbb
+            },
+            {
+                0x4e, 0x57, 0x01, 0x21, 0x00, 0x00, 0x00, 0x00,
+                0x06, 0x00, 0x01, 0x79, 0x30, 0x01, 0x0c, 0xc0,
+                0x02, 0x0c, 0xc1, 0x03, 0x0c, 0xc0, 0x04, 0x0c,
+                0xc4, 0x05, 0x0c, 0xc4, 0x06, 0x0c, 0xc2, 0x07,
+                0x0c, 0xc2, 0x08, 0x0c, 0xc1, 0x09, 0x0c, 0xba,
+                0x0a, 0x0c, 0xc1, 0x0b, 0x0c, 0xc2, 0x0c, 0x0c,
+                0xc2, 0x0d, 0x0c, 0xc2, 0x0e, 0x0c, 0xc4, 0x0f,
+                0x0c, 0xc2, 0x10, 0x0c, 0xc1, 0x80, 0x00, 0x1b,
+                0x81, 0x00, 0x1b, 0x82, 0x00, 0x1a, 0x83, 0x14,
+                0x68, 0x84, 0x03, 0x70, 0x85, 0x3c, 0x86, 0x02,
+                0x87, 0x00, 0x19, 0x89, 0x00, 0x00, 0x16, 0x86,
+                0x8a, 0x00, 0x10, 0x8b, 0x00, 0x00, 0x8c, 0x00,
+                0x07, 0x8e, 0x16, 0x80, 0x8f, 0x12, 0xc0, 0x90,
+                0x0e, 0x10, 0x91, 0x0c, 0xda, 0x92, 0x00, 0x05,
+                0x93, 0x0b, 0xb8, 0x94, 0x0c, 0x80, 0x95, 0x00,
+                0x05, 0x96, 0x01, 0x2c, 0x97, 0x00, 0x28, 0x98,
+                0x01, 0x2c, 0x99, 0x00, 0x28, 0x9a, 0x00, 0x1e,
+                0x9b, 0x0b, 0xb8, 0x9c, 0x00, 0x0a, 0x9d, 0x01,
+                0x9e, 0x00, 0x64, 0x9f, 0x00, 0x50, 0xa0, 0x00,
+                0x64, 0xa1, 0x00, 0x64, 0xa2, 0x00, 0x14, 0xa3,
+                0x00, 0x46, 0xa4, 0x00, 0x46, 0xa5, 0x00, 0x00,
+                0xa6, 0x00, 0x02, 0xa7, 0xff, 0xec, 0xa8, 0xff,
+                0xf6, 0xa9, 0x10, 0xaa, 0x00, 0x00, 0x00, 0xe6,
+                0xab, 0x01, 0xac, 0x01, 0xad, 0x04, 0x4d, 0xae,
+                0x01, 0xaf, 0x00, 0xb0, 0x00, 0x0a, 0xb1, 0x14,
+                0xb2, 0x32, 0x32, 0x31, 0x31, 0x38, 0x37, 0x00,
+                0x00, 0x00, 0x00, 0xb3, 0x00, 0xb4, 0x62, 0x65,
+                0x6b, 0x69, 0x00, 0x00, 0x00, 0x00, 0xb5, 0x32,
+                0x33, 0x30, 0x36, 0xb6, 0x00, 0x01, 0x7f, 0x2a,
+                0xb7, 0x31, 0x31, 0x2e, 0x58, 0x57, 0x5f, 0x53,
+                0x31, 0x31, 0x2e, 0x32, 0x36, 0x32, 0x48, 0x5f,
+                0xb8, 0x00, 0xb9, 0x00, 0x00, 0x00, 0xe6, 0xba,
+                0x62, 0x65, 0x6b, 0x69, 0x00, 0x00, 0x00, 0x00,
+                0x00, 0x00, 0x00, 0x00, 0x4a, 0x4b, 0x5f, 0x42,
+                0x31, 0x41, 0x32, 0x34, 0x53, 0x31, 0x35, 0x50,
+                0xc0, 0x01, 0x00, 0x00, 0x00, 0x00, 0x68, 0x00,
+                0x00, 0x4f, 0xc1
+            },
+            {
+                0x4e, 0x57, 0x01, 0x21, 0x00, 0x00, 0x00, 0x00,
+                0x06, 0x00, 0x01, 0x79, 0x30, 0x01, 0x0c, 0x13,
+                0x02, 0x0c, 0x12, 0x03, 0x0c, 0x0f, 0x04, 0x0c,
+                0x15, 0x05, 0x0c, 0x0d, 0x06, 0x0c, 0x13, 0x07,
+                0x0c, 0x16, 0x08, 0x0c, 0x13, 0x09, 0x0b, 0xdb,
+                0x0a, 0x0b, 0xf6, 0x0b, 0x0c, 0x17, 0x0c, 0x0b,
+                0xf5, 0x0d, 0x0c, 0x16, 0x0e, 0x0c, 0x1a, 0x0f,
+                0x0c, 0x1b, 0x10, 0x0c, 0x1c, 0x80, 0x00, 0x18,
+                0x81, 0x00, 0x18, 0x82, 0x00, 0x18, 0x83, 0x13,
+                0x49, 0x84, 0x00, 0x00, 0x85, 0x00, 0x86, 0x02,
+                0x87, 0x00, 0x23, 0x89, 0x00, 0x00, 0x20, 0x14,
+                0x8a, 0x00, 0x10, 0x8b, 0x00, 0x08, 0x8c, 0x00,
+                0x05, 0x8e, 0x16, 0x80, 0x8f, 0x12, 0xc0, 0x90,
+                0x0e, 0x10, 0x91, 0x0c, 0xda, 0x92, 0x00, 0x05,
+                0x93, 0x0b, 0xb8, 0x94, 0x0c, 0x80, 0x95, 0x00,
+                0x05, 0x96, 0x01, 0x2c, 0x97, 0x00, 0x28, 0x98,
+                0x01, 0x2c, 0x99, 0x00, 0x28, 0x9a, 0x00, 0x1e,
+                0x9b, 0x0b, 0xb8, 0x9c, 0x00, 0x0a, 0x9d, 0x01,
+                0x9e, 0x00, 0x64, 0x9f, 0x00, 0x50, 0xa0, 0x00,
+                0x64, 0xa1, 0x00, 0x64, 0xa2, 0x00, 0x14, 0xa3,
+                0x00, 0x46, 0xa4, 0x00, 0x46, 0xa5, 0x00, 0x00,
+                0xa6, 0x00, 0x02, 0xa7, 0xff, 0xec, 0xa8, 0xff,
+                0xf6, 0xa9, 0x10, 0xaa, 0x00, 0x00, 0x00, 0xe6,
+                0xab, 0x01, 0xac, 0x01, 0xad, 0x04, 0x4d, 0xae,
+                0x01, 0xaf, 0x00, 0xb0, 0x00, 0x0a, 0xb1, 0x14,
+                0xb2, 0x32, 0x32, 0x31, 0x31, 0x38, 0x37, 0x00,
+                0x00, 0x00, 0x00, 0xb3, 0x00, 0xb4, 0x62, 0x65,
+                0x6b, 0x69, 0x00, 0x00, 0x00, 0x00, 0xb5, 0x32,
+                0x33, 0x30, 0x36, 0xb6, 0x00, 0x02, 0x17, 0x10,
+                0xb7, 0x31, 0x31, 0x2e, 0x58, 0x57, 0x5f, 0x53,
+                0x31, 0x31, 0x2e, 0x32, 0x36, 0x32, 0x48, 0x5f,
+                0xb8, 0x00, 0xb9, 0x00, 0x00, 0x00, 0xe6, 0xba,
+                0x62, 0x65, 0x6b, 0x69, 0x00, 0x00, 0x00, 0x00,
+                0x00, 0x00, 0x00, 0x00, 0x4a, 0x4b, 0x5f, 0x42,
+                0x31, 0x41, 0x32, 0x34, 0x53, 0x31, 0x35, 0x50,
+                0xc0, 0x01, 0x00, 0x00, 0x00, 0x00, 0x68, 0x00,
+                0x00, 0x45, 0xce
+            },
+            {
+                0x4e, 0x57, 0x01, 0x21, 0x00, 0x00, 0x00, 0x00,
+                0x06, 0x00, 0x01, 0x79, 0x30, 0x01, 0x0c, 0x07,
+                0x02, 0x0c, 0x0a, 0x03, 0x0c, 0x0b, 0x04, 0x0c,
+                0x08, 0x05, 0x0c, 0x05, 0x06, 0x0c, 0x0b, 0x07,
+                0x0c, 0x07, 0x08, 0x0c, 0x0a, 0x09, 0x0c, 0x08,
+                0x0a, 0x0c, 0x06, 0x0b, 0x0c, 0x0a, 0x0c, 0x0c,
+                0x05, 0x0d, 0x0c, 0x0a, 0x0e, 0x0c, 0x0a, 0x0f,
+                0x0c, 0x0a, 0x10, 0x0c, 0x0a, 0x80, 0x00, 0x06,
+                0x81, 0x00, 0x03, 0x82, 0x00, 0x03, 0x83, 0x13,
+                0x40, 0x84, 0x00, 0x00, 0x85, 0x29, 0x86, 0x02,
+                0x87, 0x00, 0x01, 0x89, 0x00, 0x00, 0x01, 0x0a,
+                0x8a, 0x00, 0x10, 0x8b, 0x02, 0x00, 0x8c, 0x00,
+                0x02, 0x8e, 0x16, 0x80, 0x8f, 0x10, 0x40, 0x90,
+                0x0e, 0x10, 0x91, 0x0d, 0xde, 0x92, 0x00, 0x05,
+                0x93, 0x0a, 0x28, 0x94, 0x0a, 0x5a, 0x95, 0x00,
+                0x05, 0x96, 0x01, 0x2c, 0x97, 0x00, 0x28, 0x98,
+                0x01, 0x2c, 0x99, 0x00, 0x28, 0x9a, 0x00, 0x1e,
+                0x9b, 0x0b, 0xb8, 0x9c, 0x00, 0x0a, 0x9d, 0x01,
+                0x9e, 0x00, 0x5a, 0x9f, 0x00, 0x50, 0xa0, 0x00,
+                0x64, 0xa1, 0x00, 0x64, 0xa2, 0x00, 0x14, 0xa3,
+                0x00, 0x37, 0xa4, 0x00, 0x37, 0xa5, 0x00, 0x03,
+                0xa6, 0x00, 0x05, 0xa7, 0xff, 0xec, 0xa8, 0xff,
+                0xf6, 0xa9, 0x10, 0xaa, 0x00, 0x00, 0x00, 0xe6,
+                0xab, 0x01, 0xac, 0x01, 0xad, 0x04, 0x4d, 0xae,
+                0x01, 0xaf, 0x00, 0xb0, 0x00, 0x0a, 0xb1, 0x14,
+                0xb2, 0x32, 0x32, 0x31, 0x31, 0x38, 0x37, 0x00,
+                0x00, 0x00, 0x00, 0xb3, 0x00, 0xb4, 0x62, 0x65,
+                0x6b, 0x69, 0x00, 0x00, 0x00, 0x00, 0xb5, 0x32,
+                0x33, 0x30, 0x36, 0xb6, 0x00, 0x03, 0xb7, 0x2d,
+                0xb7, 0x31, 0x31, 0x2e, 0x58, 0x57, 0x5f, 0x53,
+                0x31, 0x31, 0x2e, 0x32, 0x36, 0x32, 0x48, 0x5f,
+                0xb8, 0x00, 0xb9, 0x00, 0x00, 0x00, 0xe6, 0xba,
+                0x62, 0x65, 0x6b, 0x69, 0x00, 0x00, 0x00, 0x00,
+                0x00, 0x00, 0x00, 0x00, 0x4a, 0x4b, 0x5f, 0x42,
+                0x31, 0x41, 0x32, 0x34, 0x53, 0x31, 0x35, 0x50,
+                0xc0, 0x01, 0x00, 0x00, 0x00, 0x00, 0x68, 0x00,
+                0x00, 0x41, 0x7b
+            }
+        };
+        size_t _msg_idx = 0;
+        size_t _byte_idx = 0;
+};
+
+} /* namespace JkBms */

include/JkBmsSerialMessage.h

@@ -0,0 +1,93 @@
+#pragma once
+
+#include <utility>
+#include <vector>
+#include <Arduino.h>
+
+#include "JkBmsDataPoints.h"
+
+namespace JkBms {
+
+class SerialMessage {
+    public:
+        using tData = std::vector<uint8_t>;
+
+        SerialMessage() = delete;
+
+        enum class Command : uint8_t {
+            Activate = 0x01,
+            Write = 0x02,
+            Read = 0x03,
+            Password = 0x05,
+            ReadAll = 0x06
+        };
+
+        Command getCommand() const { return static_cast<Command>(_raw[8]); }
+
+        enum class Source : uint8_t {
+            BMS = 0x00,
+            Bluetooth = 0x01,
+            GPS = 0x02,
+            Host = 0x03
+        };
+        Source getSource() const { return static_cast<Source>(_raw[9]); }
+
+        enum class Type : uint8_t {
+            Command = 0x00,
+            Response = 0x01,
+            Unsolicited = 0x02
+        };
+        Type getType() const { return static_cast<Type>(_raw[10]); }
+
+        // this does *not* include the two byte start marker
+        uint16_t getFrameLength() const { return get<uint16_t>(_raw.cbegin()+2); }
+
+        uint32_t getTerminalId() const { return get<uint32_t>(_raw.cbegin()+4); }
+
+        // there are 20 bytes of overhead. two of those are the start marker
+        // bytes, which are *not* counted by the frame length.
+        uint16_t getVariableFieldLength() const { return getFrameLength() - 18; }
+
+        // the upper byte of the 4-byte "record number" is reserved (for encryption)
+        uint32_t getSequence() const { return get<uint32_t>(_raw.cend()-9) >> 8; }
+
+        bool isValid() const;
+
+        uint8_t const* data() { return _raw.data(); }
+        size_t size() { return _raw.size(); }
+
+    protected:
+        template <typename... Args>
+        explicit SerialMessage(Args&&... args) : _raw(std::forward<Args>(args)...) { }
+
+        template<typename T, typename It> T get(It&& pos) const;
+        template<typename It> bool getBool(It&& pos) const;
+        template<typename It> int16_t getTemperature(It&& pos) const;
+        template<typename It> std::string getString(It&& pos, size_t len, bool replaceZeroes = false) const;
+        void processBatteryCurrent(tData::const_iterator& pos, uint8_t protocolVersion);
+        template<typename T> void set(tData::iterator const& pos, T val);
+        uint16_t calcChecksum() const;
+        void updateChecksum();
+
+        tData _raw;
+        JkBms::DataPointContainer _dp;
+
+        static constexpr uint16_t startMarker = 0x4e57;
+        static constexpr uint8_t endMarker = 0x68;
+};
+
+class SerialResponse : public SerialMessage {
+    public:
+        using tData = SerialMessage::tData;
+        explicit SerialResponse(tData&& raw, uint8_t protocolVersion = -1);
+
+        DataPointContainer const& getDataPoints() const { return _dp; }
+};
+
+class SerialCommand : public SerialMessage {
+    public:
+        using Command = SerialMessage::Command;
+        explicit SerialCommand(Command cmd);
+};
+
+} /* namespace JkBms */

include/MessageOutput.h

@@ -2,12 +2,13 @@
 #pragma once
 
 #include <AsyncWebSocket.h>
-#include <HardwareSerial.h>
-#include <Stream.h>
 #include <TaskSchedulerDeclarations.h>
+#include <Print.h>
+#include <freertos/task.h>
 #include <mutex>
-
+#include <vector>
-#define BUFFER_SIZE 500
+#include <unordered_map>
+#include <queue>
 
 class MessageOutputClass : public Print {
 public:
@@ -22,13 +23,19 @@ private:
 
     Task _loopTask;
 
+    using message_t = std::vector<uint8_t>;
+
+    // we keep a buffer for every task and only write complete lines to the
+    // serial output and then move them to be pushed through the websocket.
+    // this way we prevent mangling of messages from different contexts.
+    std::unordered_map<TaskHandle_t, message_t> _task_messages;
+    std::queue<message_t> _lines;
+
     AsyncWebSocket* _ws = nullptr;
-    char _buffer[BUFFER_SIZE];
-    uint16_t _buff_pos = 0;
-    uint32_t _lastSend = 0;
-    bool _forceSend = false;
 
     std::mutex _msgLock;
+
+    void serialWrite(message_t const& m);
 };
 
 extern MessageOutputClass MessageOutput;

include/MqttBattery.h

@@ -0,0 +1,32 @@
+#pragma once
+
+#include <optional>
+#include "Battery.h"
+#include <espMqttClient.h>
+
+class MqttBattery : public BatteryProvider {
+public:
+    MqttBattery() = default;
+
+    bool init(bool verboseLogging) final;
+    void deinit() final;
+    void loop() final { return; } // this class is event-driven
+    std::shared_ptr<BatteryStats> getStats() const final { return _stats; }
+
+private:
+    bool _verboseLogging = false;
+    String _socTopic;
+    String _voltageTopic;
+    String _dischargeCurrentLimitTopic;
+    std::shared_ptr<MqttBatteryStats> _stats = std::make_shared<MqttBatteryStats>();
+
+    void onMqttMessageSoC(espMqttClientTypes::MessageProperties const& properties,
+            char const* topic, uint8_t const* payload, size_t len, size_t index, size_t total,
+            char const* jsonPath);
+    void onMqttMessageVoltage(espMqttClientTypes::MessageProperties const& properties,
+            char const* topic, uint8_t const* payload, size_t len, size_t index, size_t total,
+            char const* jsonPath);
+    void onMqttMessageDischargeCurrentLimit(espMqttClientTypes::MessageProperties const& properties,
+            char const* topic, uint8_t const* payload, size_t len, size_t index, size_t total,
+            char const* jsonPath);
+};

include/MqttHandleBatteryHass.h

@@ -0,0 +1,25 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#pragma once
+
+#include <ArduinoJson.h>
+#include <TaskSchedulerDeclarations.h>
+
+class MqttHandleBatteryHassClass {
+public:
+    void init(Scheduler& scheduler);
+    void forceUpdate() { _doPublish = true; }
+
+private:
+    void loop();
+    void publish(const String& subtopic, const String& payload);
+    void publishBinarySensor(const char* caption, const char* icon, const char* subTopic, const char* payload_on, const char* payload_off);
+    void publishSensor(const char* caption, const char* icon, const char* subTopic, const char* deviceClass = NULL, const char* stateClass = NULL, const char* unitOfMeasurement = NULL);
+    void createDeviceInfo(JsonObject& object);
+
+    Task _loopTask;
+
+    bool _doPublish = true;
+    String serial = "0001"; // pseudo-serial, can be replaced in future with real serialnumber
+};
+
+extern MqttHandleBatteryHassClass MqttHandleBatteryHass;

include/MqttHandleHass.h

@@ -69,6 +69,9 @@ public:
     void publishConfig();
     void forceUpdate();
 
+    static String getDtuUniqueId();
+    static String getDtuUrl();
+
 private:
     void loop();
     static void publish(const String& subtopic, const String& payload);
@@ -95,9 +98,6 @@ private:
 
     static void createDeviceInfo(JsonDocument& doc, const String& name, const String& identifiers, const String& configuration_url, const String& manufacturer, const String& model, const String& sw_version, const String& via_device = "");
 
-    static String getDtuUniqueId();
-    static String getDtuUrl();
-
     Task _loopTask;
 
     bool _wasConnected = false;

include/MqttHandleHuawei.h

@@ -0,0 +1,60 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#pragma once
+
+#include "Configuration.h"
+#include <Huawei_can.h>
+#include <espMqttClient.h>
+#include <TaskSchedulerDeclarations.h>
+#include <mutex>
+#include <deque>
+#include <functional>
+#include <frozen/map.h>
+#include <frozen/string.h>
+
+class MqttHandleHuaweiClass {
+public:
+    void init(Scheduler& scheduler);
+
+    void forceUpdate();
+
+    void subscribeTopics();
+    void unsubscribeTopics();
+
+private:
+    void loop();
+
+    enum class Topic : unsigned {
+        LimitOnlineVoltage,
+        LimitOnlineCurrent,
+        LimitOfflineVoltage,
+        LimitOfflineCurrent,
+        Mode
+    };
+
+    static constexpr frozen::string _cmdtopic = "huawei/cmd/";
+    static constexpr frozen::map<frozen::string, Topic, 5> _subscriptions = {
+        { "limit_online_voltage",  Topic::LimitOnlineVoltage },
+        { "limit_online_current",  Topic::LimitOnlineCurrent },
+        { "limit_offline_voltage", Topic::LimitOfflineVoltage },
+        { "limit_offline_current", Topic::LimitOfflineCurrent },
+        { "mode",                  Topic::Mode },
+    };
+
+    void onMqttMessage(Topic t,
+            const espMqttClientTypes::MessageProperties& properties,
+            const char* topic, const uint8_t* payload, size_t len,
+            size_t index, size_t total);
+
+    Task _loopTask;
+
+    uint32_t _lastPublishStats;
+    uint32_t _lastPublish;
+
+    // MQTT callbacks to process updates on subscribed topics are executed in
+    // the MQTT thread's context. we use this queue to switch processing the
+    // user requests into the main loop's context (TaskScheduler context).
+    mutable std::mutex _mqttMutex;
+    std::deque<std::function<void()>> _mqttCallbacks;
+};
+
+extern MqttHandleHuaweiClass MqttHandleHuawei;

include/MqttHandlePowerLimiter.h

@@ -0,0 +1,66 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#pragma once
+
+#include "Configuration.h"
+#include <espMqttClient.h>
+#include <TaskSchedulerDeclarations.h>
+#include <mutex>
+#include <deque>
+#include <functional>
+#include <frozen/map.h>
+#include <frozen/string.h>
+
+class MqttHandlePowerLimiterClass {
+public:
+    void init(Scheduler& scheduler);
+
+    void forceUpdate();
+
+    void subscribeTopics();
+    void unsubscribeTopics();
+
+private:
+    void loop();
+
+    enum class MqttPowerLimiterCommand : unsigned {
+        Mode,
+        BatterySoCStartThreshold,
+        BatterySoCStopThreshold,
+        FullSolarPassthroughSoC,
+        VoltageStartThreshold,
+        VoltageStopThreshold,
+        FullSolarPassThroughStartVoltage,
+        FullSolarPassThroughStopVoltage,
+        UpperPowerLimit,
+        TargetPowerConsumption
+    };
+
+    static constexpr frozen::string _cmdtopic = "powerlimiter/cmd/";
+    static constexpr frozen::map<frozen::string, MqttPowerLimiterCommand, 10> _subscriptions = {
+        { "threshold/soc/start",                            MqttPowerLimiterCommand::BatterySoCStartThreshold },
+        { "threshold/soc/stop",                             MqttPowerLimiterCommand::BatterySoCStopThreshold },
+        { "threshold/soc/full_solar_passthrough",           MqttPowerLimiterCommand::FullSolarPassthroughSoC },
+        { "threshold/voltage/start",                        MqttPowerLimiterCommand::VoltageStartThreshold },
+        { "threshold/voltage/stop",                         MqttPowerLimiterCommand::VoltageStopThreshold },
+        { "threshold/voltage/full_solar_passthrough_start", MqttPowerLimiterCommand::FullSolarPassThroughStartVoltage },
+        { "threshold/voltage/full_solar_passthrough_stop",  MqttPowerLimiterCommand::FullSolarPassThroughStopVoltage },
+        { "mode",                                           MqttPowerLimiterCommand::Mode },
+        { "upper_power_limit",                              MqttPowerLimiterCommand::UpperPowerLimit },
+        { "target_power_consumption",                       MqttPowerLimiterCommand::TargetPowerConsumption },
+    };
+
+    void onMqttCmd(MqttPowerLimiterCommand command, const espMqttClientTypes::MessageProperties& properties, const char* topic, const uint8_t* payload, size_t len, size_t index, size_t total);
+
+    Task _loopTask;
+
+    uint32_t _lastPublishStats;
+    uint32_t _lastPublish;
+
+    // MQTT callbacks to process updates on subscribed topics are executed in
+    // the MQTT thread's context. we use this queue to switch processing the
+    // user requests into the main loop's context (TaskScheduler context).
+    mutable std::mutex _mqttMutex;
+    std::deque<std::function<void()>> _mqttCallbacks;
+};
+
+extern MqttHandlePowerLimiterClass MqttHandlePowerLimiter;

include/MqttHandlePowerLimiterHass.h

@@ -0,0 +1,27 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#pragma once
+
+#include <ArduinoJson.h>
+#include <TaskSchedulerDeclarations.h>
+
+class MqttHandlePowerLimiterHassClass {
+public:
+    void init(Scheduler& scheduler);
+    void publishConfig();
+    void forceUpdate();
+
+private:
+    void loop();
+    void publish(const String& subtopic, const String& payload);
+    void publishNumber(const char* caption, const char* icon, const char* category, const char* commandTopic, const char* stateTopic, const char* unitOfMeasure, const int16_t min, const int16_t max, const float step);
+    void publishSelect(const char* caption, const char* icon, const char* category, const char* commandTopic, const char* stateTopic);
+    void publishBinarySensor(const char* caption, const char* icon, const char* stateTopic, const char* payload_on, const char* payload_off);
+    void createDeviceInfo(JsonDocument& root);
+
+    Task _loopTask;
+
+    bool _wasConnected = false;
+    bool _updateForced = false;
+};
+
+extern MqttHandlePowerLimiterHassClass MqttHandlePowerLimiterHass;

include/MqttHandleVedirect.h

@@ -0,0 +1,40 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#pragma once
+
+#include "VeDirectMpptController.h"
+#include "Configuration.h"
+#include <Arduino.h>
+#include <map>
+#include <TaskSchedulerDeclarations.h>
+
+#ifndef VICTRON_PIN_RX
+#define VICTRON_PIN_RX 22
+#endif
+
+#ifndef VICTRON_PIN_TX
+#define VICTRON_PIN_TX 21
+#endif
+
+class MqttHandleVedirectClass {
+public:
+    void init(Scheduler& scheduler);
+    void forceUpdate();
+private:
+    void loop();
+    std::map<std::string, VeDirectMpptController::data_t> _kvFrames;
+
+    Task _loopTask;
+
+    // point of time in millis() when updated values will be published
+    uint32_t _nextPublishUpdatesOnly = 0;
+
+    // point of time in millis() when all values will be published
+    uint32_t _nextPublishFull = 1;
+
+    bool _PublishFull;
+
+    void publish_mppt_data(const VeDirectMpptController::data_t &mpptData,
+                           const VeDirectMpptController::data_t &frame) const;
+};
+
+extern MqttHandleVedirectClass MqttHandleVedirect;

include/MqttHandleVedirectHass.h

@@ -0,0 +1,33 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#pragma once
+
+#include <ArduinoJson.h>
+#include "VeDirectMpptController.h"
+#include <TaskSchedulerDeclarations.h>
+
+class MqttHandleVedirectHassClass {
+public:
+    void init(Scheduler& scheduler);
+    void publishConfig();
+    void forceUpdate();
+
+private:
+    void loop();
+    void publish(const String& subtopic, const String& payload);
+    void publishBinarySensor(const char *caption, const char *icon, const char *subTopic,
+                             const char *payload_on, const char *payload_off,
+                             const VeDirectMpptController::data_t &mpptData);
+    void publishSensor(const char *caption, const char *icon, const char *subTopic,
+                       const char *deviceClass, const char *stateClass,
+                       const char *unitOfMeasurement,
+                       const VeDirectMpptController::data_t &mpptData);
+    void createDeviceInfo(JsonObject &object,
+                          const VeDirectMpptController::data_t &mpptData);
+
+    Task _loopTask;
+
+    bool _wasConnected = false;
+    bool _updateForced = false;
+};
+
+extern MqttHandleVedirectHassClass MqttHandleVedirectHass;

include/MqttSettings.h

@@ -11,6 +11,7 @@ class MqttSettingsClass {
 public:
     MqttSettingsClass();
     void init();
+    void loop();
     void performReconnect();
     bool getConnected();
     void publish(const String& subtopic, const String& payload);
@@ -38,6 +39,7 @@ private:
     Ticker _mqttReconnectTimer;
     MqttSubscribeParser _mqttSubscribeParser;
     std::mutex _clientLock;
+    bool _verboseLogging = true;
 };
 
 extern MqttSettingsClass MqttSettings;

include/PinMapping.h

@@ -51,6 +51,29 @@ struct PinMapping_t {
     uint8_t display_reset;
 
     int8_t led[PINMAPPING_LED_COUNT];
+
+    // OpenDTU-OnBattery-specific pins below
+    int8_t victron_tx;
+    int8_t victron_rx;
+    int8_t victron_tx2;
+    int8_t victron_rx2;
+    int8_t victron_tx3;
+    int8_t victron_rx3;
+    int8_t battery_rx;
+    int8_t battery_rxen;
+    int8_t battery_tx;
+    int8_t battery_txen;
+    int8_t huawei_miso;
+    int8_t huawei_mosi;
+    int8_t huawei_clk;
+    int8_t huawei_irq;
+    int8_t huawei_cs;
+    int8_t huawei_power;
+    int8_t powermeter_rx;
+    int8_t powermeter_tx;
+    int8_t powermeter_dere;
+    int8_t powermeter_rxen;
+    int8_t powermeter_txen;
 };
 
 class PinMappingClass {
@@ -65,6 +88,7 @@ public:
 #if CONFIG_ETH_USE_ESP32_EMAC
     bool isValidEthConfig() const;
 #endif
+    bool isValidHuaweiConfig() const;
 
 private:
     PinMapping_t _pinMapping;

include/PowerLimiter.h

@@ -0,0 +1,105 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#pragma once
+
+#include "Configuration.h"
+#include "PowerLimiterInverter.h"
+#include <espMqttClient.h>
+#include <Arduino.h>
+#include <atomic>
+#include <deque>
+#include <memory>
+#include <functional>
+#include <optional>
+#include <TaskSchedulerDeclarations.h>
+#include <frozen/string.h>
+
+#define PL_UI_STATE_INACTIVE 0
+#define PL_UI_STATE_CHARGING 1
+#define PL_UI_STATE_USE_SOLAR_ONLY 2
+#define PL_UI_STATE_USE_SOLAR_AND_BATTERY 3
+
+class PowerLimiterClass {
+public:
+    PowerLimiterClass() = default;
+
+    enum class Status : unsigned {
+        Initializing,
+        DisabledByConfig,
+        DisabledByMqtt,
+        WaitingForValidTimestamp,
+        PowerMeterPending,
+        InverterInvalid,
+        InverterCmdPending,
+        ConfigReload,
+        InverterStatsPending,
+        FullSolarPassthrough,
+        UnconditionalSolarPassthrough,
+        Stable,
+    };
+
+    void init(Scheduler& scheduler);
+    void triggerReloadingConfig() { _reloadConfigFlag = true; }
+    uint8_t getInverterUpdateTimeouts() const;
+    uint8_t getPowerLimiterState();
+    int32_t getInverterOutput() { return _lastExpectedInverterOutput; }
+    bool getFullSolarPassThroughEnabled() const { return _fullSolarPassThroughEnabled; }
+
+    enum class Mode : unsigned {
+        Normal = 0,
+        Disabled = 1,
+        UnconditionalFullSolarPassthrough = 2
+    };
+
+    void setMode(Mode m) { _mode = m; }
+    Mode getMode() const { return _mode; }
+    bool usesBatteryPoweredInverter();
+    bool isGovernedInverterProducing();
+
+private:
+    void loop();
+
+    Task _loopTask;
+
+    std::atomic<bool> _reloadConfigFlag = true;
+    uint16_t _lastExpectedInverterOutput = 0;
+    Status _lastStatus = Status::Initializing;
+    uint32_t _lastStatusPrinted = 0;
+    uint32_t _lastCalculation = 0;
+    static constexpr uint32_t _calculationBackoffMsDefault = 128;
+    uint32_t _calculationBackoffMs = _calculationBackoffMsDefault;
+    Mode _mode = Mode::Normal;
+
+    std::deque<std::unique_ptr<PowerLimiterInverter>> _inverters;
+    bool _batteryDischargeEnabled = false;
+    bool _nighttimeDischarging = false;
+    std::pair<bool, uint32_t> _nextInverterRestart = { false, 0 };
+    bool _fullSolarPassThroughEnabled = false;
+    bool _verboseLogging = true;
+
+    frozen::string const& getStatusText(Status status);
+    void announceStatus(Status status);
+    bool shutdown(Status status);
+    void reloadConfig();
+    std::pair<float, char const*> getInverterDcVoltage();
+    float getBatteryVoltage(bool log = false);
+    uint16_t solarDcToInverterAc(uint16_t dcPower);
+    void fullSolarPassthrough(PowerLimiterClass::Status reason);
+    int16_t calcHouseholdConsumption();
+    using inverter_filter_t = std::function<bool(PowerLimiterInverter const&)>;
+    uint16_t updateInverterLimits(uint16_t powerRequested, inverter_filter_t filter, std::string const& filterExpression);
+    uint16_t calcBatteryAllowance(uint16_t powerRequested);
+    bool updateInverters();
+    uint16_t getSolarPassthroughPower();
+    std::optional<uint16_t> getBatteryDischargeLimit();
+    float getBatteryInvertersOutputAcWatts();
+    float getLoadCorrectedVoltage();
+    bool testThreshold(float socThreshold, float voltThreshold,
+            std::function<bool(float, float)> compare);
+    bool isStartThresholdReached();
+    bool isStopThresholdReached();
+    bool isBelowStopThreshold();
+    void calcNextInverterRestart();
+    bool isFullSolarPassthroughActive();
+};
+
+extern PowerLimiterClass PowerLimiter;

include/PowerLimiterBatteryInverter.h

@@ -0,0 +1,19 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#pragma once
+
+#include "PowerLimiterInverter.h"
+
+class PowerLimiterBatteryInverter : public PowerLimiterInverter {
+public:
+    PowerLimiterBatteryInverter(bool verboseLogging, PowerLimiterInverterConfig const& config);
+
+    uint16_t getMaxReductionWatts(bool allowStandby) const final;
+    uint16_t getMaxIncreaseWatts() const final;
+    uint16_t applyReduction(uint16_t reduction, bool allowStandby) final;
+    uint16_t applyIncrease(uint16_t increase) final;
+    uint16_t standby() final;
+    bool isSolarPowered() const final { return false; }
+
+private:
+    void setAcOutput(uint16_t expectedOutputWatts) final;
+};

include/PowerLimiterInverter.h

@@ -0,0 +1,111 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#pragma once
+
+#include "Configuration.h"
+#include <Hoymiles.h>
+#include <optional>
+#include <memory>
+
+class PowerLimiterInverter {
+public:
+    static std::unique_ptr<PowerLimiterInverter> create(bool verboseLogging, PowerLimiterInverterConfig const& config);
+
+    // send command(s) to inverter to reach desired target state (limit and
+    // production). return true if an update is pending, i.e., if the target
+    // state is NOT yet reached, false otherwise.
+    bool update();
+
+    // returns the timestamp of the oldest stats received for this inverter
+    // *after* its last command completed. return std::nullopt if new stats
+    // are pending after the last command completed.
+    std::optional<uint32_t> getLatestStatsMillis() const;
+
+    // the amount of times an update command issued to the inverter timed out
+    uint8_t getUpdateTimeouts() const { return _updateTimeouts; }
+
+    // maximum amount of AC power the inverter is able to produce
+    // (not regarding the configured upper power limit)
+    uint16_t getInverterMaxPowerWatts() const;
+
+    // maximum amount of AC power the inverter is allowed to produce as per
+    // upper power limit (additionally restricted by inverter's absolute max)
+    uint16_t getConfiguredMaxPowerWatts() const;
+
+    uint16_t getCurrentOutputAcWatts() const;
+
+    // this differs from current output power if new limit was assigned
+    uint16_t getExpectedOutputAcWatts() const;
+
+    // the maximum reduction of power output the inverter
+    // can achieve with or withouth going into standby.
+    virtual uint16_t getMaxReductionWatts(bool allowStandby) const = 0;
+
+    // the maximum increase of power output the inverter can achieve
+    // (is expected to achieve), possibly coming out of standby.
+    virtual uint16_t getMaxIncreaseWatts() const = 0;
+
+    // change the target limit such that the requested change becomes effective
+    // on the expected AC power output. returns the change in the range
+    // [0..reduction] that will become effective (once update() returns false).
+    virtual uint16_t applyReduction(uint16_t reduction, bool allowStandby) = 0;
+    virtual uint16_t applyIncrease(uint16_t increase) = 0;
+
+    // stop producing AC power. returns the change in power output
+    // that will become effective (once update() returns false).
+    virtual uint16_t standby() = 0;
+
+    // wake the inverter from standby and set it to produce
+    // as much power as permissible by its upper power limit.
+    void setMaxOutput();
+
+    void restart();
+
+    float getDcVoltage(uint8_t input);
+    bool isSendingCommandsEnabled() const { return _spInverter->getEnableCommands(); }
+    bool isReachable() const { return _spInverter->isReachable(); }
+    bool isProducing() const { return _spInverter->isProducing(); }
+
+    uint64_t getSerial() const { return _config.Serial; }
+    char const* getSerialStr() const { return _serialStr; }
+    bool isBehindPowerMeter() const { return _config.IsBehindPowerMeter; }
+    virtual bool isSolarPowered() const = 0;
+
+    void debug() const;
+
+protected:
+    PowerLimiterInverter(bool verboseLogging, PowerLimiterInverterConfig const& config);
+
+    // returns false if the inverter cannot participate
+    // in achieving the requested change in power output
+    bool isEligible() const;
+
+    uint16_t getCurrentLimitWatts() const;
+
+    void setTargetPowerLimitWatts(uint16_t power) { _oTargetPowerLimitWatts = power; }
+    void setTargetPowerState(bool enable) { _oTargetPowerState = enable; }
+    void setExpectedOutputAcWatts(uint16_t power) { _expectedOutputAcWatts = power; }
+
+    // copied to avoid races with web UI
+    PowerLimiterInverterConfig _config;
+
+    // Hoymiles lib inverter instance
+    std::shared_ptr<InverterAbstract> _spInverter = nullptr;
+
+    bool _verboseLogging;
+    char _logPrefix[32];
+
+private:
+    virtual void setAcOutput(uint16_t expectedOutputWatts) = 0;
+
+    char _serialStr[16];
+
+    // track (target) state
+    uint8_t _updateTimeouts = 0;
+    std::optional<uint32_t> _oUpdateStartMillis = std::nullopt;
+    std::optional<uint16_t> _oTargetPowerLimitWatts = std::nullopt;
+    std::optional<bool> _oTargetPowerState = std::nullopt;
+    mutable std::optional<uint32_t> _oStatsMillis = std::nullopt;
+
+    // the expected AC output (possibly is different from the target limit)
+    uint16_t _expectedOutputAcWatts = 0;
+};

include/PowerLimiterSolarInverter.h

@@ -0,0 +1,20 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#pragma once
+
+#include "PowerLimiterInverter.h"
+
+class PowerLimiterSolarInverter : public PowerLimiterInverter {
+public:
+    PowerLimiterSolarInverter(bool verboseLogging, PowerLimiterInverterConfig const& config);
+
+    uint16_t getMaxReductionWatts(bool allowStandby) const final;
+    uint16_t getMaxIncreaseWatts() const final;
+    uint16_t applyReduction(uint16_t reduction, bool allowStandby) final;
+    uint16_t applyIncrease(uint16_t increase) final;
+    uint16_t standby() final;
+    bool isSolarPowered() const final { return true; }
+
+private:
+    uint16_t scaleLimit(uint16_t expectedOutputWatts);
+    void setAcOutput(uint16_t expectedOutputWatts) final;
+};

include/PowerMeter.h

@@ -0,0 +1,27 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#pragma once
+
+#include "PowerMeterProvider.h"
+#include <TaskSchedulerDeclarations.h>
+#include <memory>
+#include <mutex>
+
+class PowerMeterClass {
+public:
+    void init(Scheduler& scheduler);
+
+    void updateSettings();
+
+    float getPowerTotal() const;
+    uint32_t getLastUpdate() const;
+    bool isDataValid() const;
+
+private:
+    void loop();
+
+    Task _loopTask;
+    mutable std::mutex _mutex;
+    std::unique_ptr<PowerMeterProvider> _upProvider = nullptr;
+};
+
+extern PowerMeterClass PowerMeter;

include/PowerMeterHttpJson.h

@@ -0,0 +1,53 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#pragma once
+
+#include <atomic>
+#include <array>
+#include <variant>
+#include <memory>
+#include <condition_variable>
+#include <mutex>
+#include <stdint.h>
+#include "HttpGetter.h"
+#include "Configuration.h"
+#include "PowerMeterProvider.h"
+
+using Auth_t = HttpRequestConfig::Auth;
+using Unit_t = PowerMeterHttpJsonValue::Unit;
+
+class PowerMeterHttpJson : public PowerMeterProvider {
+public:
+    explicit PowerMeterHttpJson(PowerMeterHttpJsonConfig const& cfg)
+        : _cfg(cfg) { }
+
+    ~PowerMeterHttpJson();
+
+    bool init() final;
+    void loop() final;
+    float getPowerTotal() const final;
+    bool isDataValid() const final;
+    void doMqttPublish() const final;
+
+    using power_values_t = std::array<float, POWERMETER_HTTP_JSON_MAX_VALUES>;
+    using poll_result_t = std::variant<power_values_t, String>;
+    poll_result_t poll();
+
+private:
+    static void pollingLoopHelper(void* context);
+    std::atomic<bool> _taskDone;
+    void pollingLoop();
+
+    PowerMeterHttpJsonConfig const _cfg;
+
+    uint32_t _lastPoll = 0;
+
+    mutable std::mutex _valueMutex;
+    power_values_t _powerValues = {};
+
+    std::array<std::unique_ptr<HttpGetter>, POWERMETER_HTTP_JSON_MAX_VALUES> _httpGetters;
+
+    TaskHandle_t _taskHandle = nullptr;
+    bool _stopPolling;
+    mutable std::mutex _pollingMutex;
+    std::condition_variable _cv;
+};

include/PowerMeterHttpSml.h

@@ -0,0 +1,45 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#pragma once
+
+#include <atomic>
+#include <memory>
+#include <condition_variable>
+#include <mutex>
+#include <stdint.h>
+#include <Arduino.h>
+#include "HttpGetter.h"
+#include "Configuration.h"
+#include "PowerMeterSml.h"
+
+class PowerMeterHttpSml : public PowerMeterSml {
+public:
+    explicit PowerMeterHttpSml(PowerMeterHttpSmlConfig const& cfg)
+        : PowerMeterSml("PowerMeterHttpSml")
+        , _cfg(cfg) { }
+
+    ~PowerMeterHttpSml();
+
+    bool init() final;
+    void loop() final;
+    bool isDataValid() const final;
+
+    // returns an empty string on success,
+    // returns an error message otherwise.
+    String poll();
+
+private:
+    static void pollingLoopHelper(void* context);
+    std::atomic<bool> _taskDone;
+    void pollingLoop();
+
+    PowerMeterHttpSmlConfig const _cfg;
+
+    uint32_t _lastPoll = 0;
+
+    std::unique_ptr<HttpGetter> _upHttpGetter;
+
+    TaskHandle_t _taskHandle = nullptr;
+    bool _stopPolling;
+    mutable std::mutex _pollingMutex;
+    std::condition_variable _cv;
+};

include/PowerMeterMqtt.h

@@ -0,0 +1,39 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#pragma once
+
+#include "Configuration.h"
+#include "PowerMeterProvider.h"
+#include <espMqttClient.h>
+#include <vector>
+#include <mutex>
+#include <array>
+
+class PowerMeterMqtt : public PowerMeterProvider {
+public:
+    explicit PowerMeterMqtt(PowerMeterMqttConfig const& cfg)
+        : _cfg(cfg) { }
+
+    ~PowerMeterMqtt();
+
+    bool init() final;
+    void loop() final { }
+    float getPowerTotal() const final;
+
+private:
+    using MsgProperties = espMqttClientTypes::MessageProperties;
+    void onMessage(MsgProperties const& properties, char const* topic,
+            uint8_t const* payload, size_t len, size_t index,
+            size_t total, float* targetVariable, PowerMeterMqttValue const* cfg);
+
+    // we don't need to republish data received from MQTT
+    void doMqttPublish() const final { };
+
+    PowerMeterMqttConfig const _cfg;
+
+    using power_values_t = std::array<float, POWERMETER_MQTT_MAX_VALUES>;
+    power_values_t _powerValues;
+
+    std::vector<String> _mqttSubscriptions;
+
+    mutable std::mutex _mutex;
+};

include/PowerMeterProvider.h

@@ -0,0 +1,51 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#pragma once
+
+#include <atomic>
+#include "Configuration.h"
+
+class PowerMeterProvider {
+public:
+    virtual ~PowerMeterProvider() { }
+
+    enum class Type : unsigned {
+        MQTT = 0,
+        SDM1PH = 1,
+        SDM3PH = 2,
+        HTTP_JSON = 3,
+        SERIAL_SML = 4,
+        SMAHM2 = 5,
+        HTTP_SML = 6
+    };
+
+    // returns true if the provider is ready for use, false otherwise
+    virtual bool init() = 0;
+
+    virtual void loop() = 0;
+    virtual float getPowerTotal() const = 0;
+    virtual bool isDataValid() const;
+
+    uint32_t getLastUpdate() const { return _lastUpdate; }
+    void mqttLoop() const;
+
+protected:
+    PowerMeterProvider() {
+        auto const& config = Configuration.get();
+        _verboseLogging = config.PowerMeter.VerboseLogging;
+    }
+
+    void gotUpdate() { _lastUpdate = millis(); }
+
+    void mqttPublish(String const& topic, float const& value) const;
+
+    bool _verboseLogging;
+
+private:
+    virtual void doMqttPublish() const = 0;
+
+    // gotUpdate() updates this variable potentially from a different thread
+    // than users that request to read this variable through getLastUpdate().
+    std::atomic<uint32_t> _lastUpdate = 0;
+
+    mutable uint32_t _lastMqttPublish = 0;
+};

include/PowerMeterSerialSdm.h

@@ -0,0 +1,60 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#pragma once
+
+#include <atomic>
+#include <mutex>
+#include <condition_variable>
+#include <SoftwareSerial.h>
+#include "Configuration.h"
+#include "PowerMeterProvider.h"
+#include "SDM.h"
+
+class PowerMeterSerialSdm : public PowerMeterProvider {
+public:
+    enum class Phases {
+        One,
+        Three
+    };
+
+    PowerMeterSerialSdm(Phases phases, PowerMeterSerialSdmConfig const& cfg)
+        : _phases(phases)
+        , _cfg(cfg) { }
+
+    ~PowerMeterSerialSdm();
+
+    bool init() final;
+    void loop() final;
+    float getPowerTotal() const final;
+    bool isDataValid() const final;
+    void doMqttPublish() const final;
+
+private:
+    static void pollingLoopHelper(void* context);
+    bool readValue(std::unique_lock<std::mutex>& lock, uint16_t reg, float& targetVar);
+    std::atomic<bool> _taskDone;
+    void pollingLoop();
+
+    Phases _phases;
+    PowerMeterSerialSdmConfig const _cfg;
+
+    uint32_t _lastPoll = 0;
+
+    float _phase1Power = 0.0;
+    float _phase2Power = 0.0;
+    float _phase3Power = 0.0;
+    float _phase1Voltage = 0.0;
+    float _phase2Voltage = 0.0;
+    float _phase3Voltage = 0.0;
+    float _energyImport = 0.0;
+    float _energyExport = 0.0;
+
+    mutable std::mutex _valueMutex;
+
+    std::unique_ptr<SoftwareSerial> _upSdmSerial = nullptr;
+    std::unique_ptr<SDM> _upSdm = nullptr;
+
+    TaskHandle_t _taskHandle = nullptr;
+    bool _stopPolling;
+    mutable std::mutex _pollingMutex;
+    std::condition_variable _cv;
+};

include/PowerMeterSerialSml.h

@@ -0,0 +1,44 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#pragma once
+
+#include "PowerMeterSml.h"
+#include <SoftwareSerial.h>
+
+class PowerMeterSerialSml : public PowerMeterSml {
+public:
+    PowerMeterSerialSml()
+        : PowerMeterSml("PowerMeterSerialSml") { }
+
+    ~PowerMeterSerialSml();
+
+    bool init() final;
+    void loop() final;
+
+private:
+    // we assume that an SML datagram is complete after no additional
+    // characters were received for this many milliseconds.
+    static uint8_t constexpr _datagramGapMillis = 50;
+
+    static uint32_t constexpr _baud = 9600;
+
+    // size in bytes of the software serial receive buffer. must have the
+    // capacity to hold a full SML datagram, as we are processing the datagrams
+    // only after all data of one datagram was received.
+    static int constexpr _bufCapacity = 1024; // memory usage: 1 byte each
+
+    // amount of bits (RX pin state transitions) the software serial can buffer
+    // without decoding bits to bytes and storing those in the receive buffer.
+    // this value dictates how ofter we need to call a function of the software
+    // serial instance that performs bit decoding (we call available()).
+    static int constexpr _isrCapacity = 256; // memory usage: 8 bytes each (timestamp + pointer)
+
+    static void pollingLoopHelper(void* context);
+    std::atomic<bool> _taskDone;
+    void pollingLoop();
+
+    TaskHandle_t _taskHandle = nullptr;
+    bool _stopPolling;
+    mutable std::mutex _pollingMutex;
+
+    std::unique_ptr<SoftwareSerial> _upSmlSerial = nullptr;
+};

include/PowerMeterSml.h

@@ -0,0 +1,69 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#pragma once
+
+#include <list>
+#include <mutex>
+#include <optional>
+#include <stdint.h>
+#include <Arduino.h>
+#include <HTTPClient.h>
+#include "Configuration.h"
+#include "PowerMeterProvider.h"
+#include "sml.h"
+
+class PowerMeterSml : public PowerMeterProvider {
+public:
+    float getPowerTotal() const final;
+    void doMqttPublish() const final;
+
+protected:
+    explicit PowerMeterSml(char const* user)
+        : _user(user) { }
+
+    void reset();
+    void processSmlByte(uint8_t byte);
+
+private:
+    std::string _user;
+    mutable std::mutex _mutex;
+
+    using values_t = struct {
+        std::optional<float> activePowerTotal = std::nullopt;
+        std::optional<float> activePowerL1 = std::nullopt;
+        std::optional<float> activePowerL2 = std::nullopt;
+        std::optional<float> activePowerL3 = std::nullopt;
+        std::optional<float> voltageL1 = std::nullopt;
+        std::optional<float> voltageL2 = std::nullopt;
+        std::optional<float> voltageL3 = std::nullopt;
+        std::optional<float> currentL1 = std::nullopt;
+        std::optional<float> currentL2 = std::nullopt;
+        std::optional<float> currentL3 = std::nullopt;
+        std::optional<float> energyImport = std::nullopt;
+        std::optional<float> energyExport = std::nullopt;
+    };
+
+    values_t _values;
+    values_t _cache;
+
+    using OBISHandler = struct {
+        uint8_t const OBIS[6];
+        void (*decoder)(float&);
+        std::optional<float>* target;
+        char const* name;
+    };
+
+    const std::list<OBISHandler> smlHandlerList{
+        {{0x01, 0x00, 0x10, 0x07, 0x00, 0xff}, &smlOBISW, &_cache.activePowerTotal, "active power total"},
+        {{0x01, 0x00, 0x24, 0x07, 0x00, 0xff}, &smlOBISW, &_cache.activePowerL1, "active power L1"},
+        {{0x01, 0x00, 0x38, 0x07, 0x00, 0xff}, &smlOBISW, &_cache.activePowerL2, "active power L2"},
+        {{0x01, 0x00, 0x4c, 0x07, 0x00, 0xff}, &smlOBISW, &_cache.activePowerL3, "active power L3"},
+        {{0x01, 0x00, 0x20, 0x07, 0x00, 0xff}, &smlOBISVolt, &_cache.voltageL1, "voltage L1"},
+        {{0x01, 0x00, 0x34, 0x07, 0x00, 0xff}, &smlOBISVolt, &_cache.voltageL2, "voltage L2"},
+        {{0x01, 0x00, 0x48, 0x07, 0x00, 0xff}, &smlOBISVolt, &_cache.voltageL3, "voltage L3"},
+        {{0x01, 0x00, 0x1f, 0x07, 0x00, 0xff}, &smlOBISAmpere, &_cache.currentL1, "current L1"},
+        {{0x01, 0x00, 0x33, 0x07, 0x00, 0xff}, &smlOBISAmpere, &_cache.currentL2, "current L2"},
+        {{0x01, 0x00, 0x47, 0x07, 0x00, 0xff}, &smlOBISAmpere, &_cache.currentL3, "current L3"},
+        {{0x01, 0x00, 0x01, 0x08, 0x00, 0xff}, &smlOBISWh, &_cache.energyImport, "energy import"},
+        {{0x01, 0x00, 0x02, 0x08, 0x00, 0xff}, &smlOBISWh, &_cache.energyExport, "energy export"}
+    };
+};

include/PowerMeterUdpSmaHomeManager.h

@@ -0,0 +1,31 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2024 Holger-Steffen Stapf
+ */
+#pragma once
+
+#include <cstdint>
+#include "PowerMeterProvider.h"
+
+class PowerMeterUdpSmaHomeManager : public PowerMeterProvider {
+public:
+    ~PowerMeterUdpSmaHomeManager();
+
+    bool init() final;
+    void loop() final;
+    float getPowerTotal() const final { return _powerMeterPower; }
+    void doMqttPublish() const final;
+
+private:
+    void Soutput(int kanal, int index, int art, int tarif,
+            char const* name, float value, uint32_t timestamp);
+
+    uint8_t* decodeGroup(uint8_t* offset, uint16_t grouplen);
+
+    float _powerMeterPower = 0.0;
+    float _powerMeterL1 = 0.0;
+    float _powerMeterL2 = 0.0;
+    float _powerMeterL3 = 0.0;
+    uint32_t _previousMillis = 0;
+    uint32_t _serial = 0;
+};

include/PylontechCanReceiver.h

@@ -0,0 +1,22 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#pragma once
+
+#include "Configuration.h"
+#include "Battery.h"
+#include "BatteryCanReceiver.h"
+#include <driver/twai.h>
+#include <Arduino.h>
+
+class PylontechCanReceiver : public BatteryCanReceiver {
+public:
+    bool init(bool verboseLogging) final;
+    void onMessage(twai_message_t rx_message) final;
+
+    std::shared_ptr<BatteryStats> getStats() const final { return _stats; }
+
+private:
+    void dummyData();
+
+    std::shared_ptr<PylontechBatteryStats> _stats =
+        std::make_shared<PylontechBatteryStats>();
+};

include/PytesCanReceiver.h

@@ -0,0 +1,19 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#pragma once
+
+#include "Configuration.h"
+#include "Battery.h"
+#include "BatteryCanReceiver.h"
+#include <driver/twai.h>
+
+class PytesCanReceiver : public BatteryCanReceiver {
+public:
+    bool init(bool verboseLogging) final;
+    void onMessage(twai_message_t rx_message) final;
+
+    std::shared_ptr<BatteryStats> getStats() const final { return _stats; }
+
+private:
+    std::shared_ptr<PytesBatteryStats> _stats =
+        std::make_shared<PytesBatteryStats>();
+};

include/SBSCanReceiver.h

@@ -0,0 +1,19 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#pragma once
+
+#include "BatteryCanReceiver.h"
+#include <driver/twai.h>
+#include <Arduino.h>
+
+class SBSCanReceiver : public BatteryCanReceiver {
+public:
+    bool init(bool verboseLogging) final;
+    void onMessage(twai_message_t rx_message) final;
+
+    std::shared_ptr<BatteryStats> getStats() const final { return _stats; }
+
+private:
+    void dummyData();
+    std::shared_ptr<SBSBatteryStats> _stats =
+        std::make_shared<SBSBatteryStats>();
+};

include/SerialPortManager.h

@@ -0,0 +1,21 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#pragma once
+
+#include <array>
+#include <optional>
+#include <string>
+
+class SerialPortManagerClass {
+public:
+    void init();
+
+    std::optional<uint8_t> allocatePort(std::string const& owner);
+    void freePort(std::string const& owner);
+
+private:
+    // the amount of hardare UARTs available on supported ESP32 chips
+    static size_t constexpr _num_controllers = 3;
+    std::array<std::string, _num_controllers> _ports = { "" };
+};
+
+extern SerialPortManagerClass SerialPortManager;

include/SyslogLogger.h

@@ -0,0 +1,34 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#pragma once
+#include <WiFiUdp.h>
+#include <TaskSchedulerDeclarations.h>
+#include <mutex>
+
+class SyslogLogger {
+public:
+    SyslogLogger();
+    void init(Scheduler& scheduler);
+    void updateSettings(const String&& hostname);
+    void write(const uint8_t *buffer, size_t size);
+
+private:
+    void loop();
+    void disable();
+    void enable();
+    bool resolveAndStart();
+    bool isResolved() const {
+        return _address != INADDR_NONE;
+    }
+
+    Task _loopTask;
+    std::mutex _mutex;
+    WiFiUDP _udp;
+    IPAddress _address;
+    String _syslog_hostname;
+    String _proc_id;
+    String _header;
+    uint16_t _port;
+    bool _enabled;
+};
+
+extern SyslogLogger Syslog;