commit 805e492fe957c7e8593198449db5acd40e8a4c33
Author: Patrick Haßel <git@patrick-hassel.de>
Date:   Wed Aug 27 23:12:18 2025 +0200

    WiFi, Hostname, OTA, Button, Relay, Status, config

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..03f4a3c
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+.pio
diff --git a/platformio.ini b/platformio.ini
new file mode 100644
index 0000000..b0e3e11
--- /dev/null
+++ b/platformio.ini
@@ -0,0 +1,8 @@
+[env:Sonoff4ChPro]
+platform = espressif8266
+board = esp8285
+framework = arduino
+upload_speed = 921600
+upload_port = 10.0.0.178
+monitor_speed = 115200
+build.filesystem = littlefs
\ No newline at end of file
diff --git a/src/Button.h b/src/Button.h
new file mode 100644
index 0000000..0f33a90
--- /dev/null
+++ b/src/Button.h
@@ -0,0 +1,74 @@
+#ifndef BUTTON_H
+#define BUTTON_H
+
+#include <Arduino.h>
+
+enum ButtonEvent {
+  BUTTON_PRESSED,
+  BUTTON_PRESSED_LONG,
+  BUTTON_RELEASED,
+  BUTTON_RELEASED_SHORT,
+  BUTTON_RELEASED_LONG,
+};
+
+class Button {
+
+public:
+
+  typedef void (*callback_t)(ButtonEvent event);
+
+private:
+
+  const uint8_t pin;
+
+  const bool pullup;
+
+  const bool inverted;
+
+  const callback_t callback;
+
+  bool lastState = false;
+
+  bool pressedLong = false;
+
+  unsigned long lastMillis = 0;
+
+public:
+
+  explicit Button(const uint8_t pin, const bool pullup, const bool inverted, const callback_t callback) : pin(pin), pullup(pullup), inverted(inverted), callback(callback) {
+    //
+  }
+
+  void setup() {
+    pinMode(pin, pullup ? INPUT_PULLUP : INPUT);
+    lastMillis = millis();
+    lastState = (digitalRead(pin) == HIGH) ^ inverted;
+  }
+
+  void loop() {
+    const auto currentMillis = millis();
+    const auto currentState = digitalRead(pin) == LOW;
+    const auto duration = currentMillis - lastMillis;
+    if (lastState != currentState && duration >= 200) {
+      if (currentState) {
+        callback(BUTTON_PRESSED);
+      } else {
+        callback(BUTTON_RELEASED);
+        if (pressedLong) {
+          callback(BUTTON_RELEASED_LONG);
+        } else {
+          callback(BUTTON_RELEASED_SHORT);
+        }
+        pressedLong = false;
+      }
+      lastState = currentState;
+      lastMillis = currentMillis;
+    } else if (lastState && duration >= 3000 && !pressedLong) {
+      pressedLong = true;
+      callback(BUTTON_PRESSED_LONG);
+    }
+  }
+
+};
+
+#endif
diff --git a/src/Output.h b/src/Output.h
new file mode 100644
index 0000000..d5d406b
--- /dev/null
+++ b/src/Output.h
@@ -0,0 +1,47 @@
+#ifndef OUTPUT_H
+#define OUTPUT_H
+
+#include <Arduino.h>
+
+class Output {
+
+  const char *name;
+
+  const uint8_t pin;
+
+  const bool inverted;
+
+  const bool logState;
+
+public:
+
+  Output(const char *name, const uint8_t pin, const bool inverted, const bool logState): name(name), pin(pin), inverted(inverted), logState(logState) {
+    //
+  }
+
+  void setup() const {
+    pinMode(pin, OUTPUT);
+  }
+
+  void set(const bool state) const {
+    if (logState && state != get()) {
+      Serial.printf("%s: %s\n", name, state ? "ON" : "OFF");
+    }
+    digitalWrite(pin, state ^ inverted ? HIGH : LOW);
+  }
+
+  bool get() const {
+    return (digitalRead(pin) == HIGH) ^ inverted;
+  }
+
+  void toggle() const {
+    set(!get());
+  }
+
+  void loop() const {
+    // TODO auto off etc
+  }
+
+};
+
+#endif
diff --git a/src/config.cpp b/src/config.cpp
new file mode 100644
index 0000000..3aa0c5e
--- /dev/null
+++ b/src/config.cpp
@@ -0,0 +1,35 @@
+#include "config.h"
+
+#include <LittleFS.h>
+
+void configSetup() {
+  LittleFS.begin();
+}
+
+File configOpen(const char *name, const char *mode) {
+  char path[64];
+  snprintf(path, sizeof(path), "/%s", name);
+  return LittleFS.open(path, mode);
+}
+
+String configReadString(const char *name, const char *fallback) {
+  if (auto file = configOpen(name, "r")) {
+    const auto content = file.readString();
+    file.close();
+    return content;
+  }
+  return fallback;
+}
+
+bool configWriteString(const char *name, const char *fallback, const String &value) {
+  if (configReadString(name, fallback) == value) {
+    return false;
+  }
+  Serial.printf("\"%s\" = \"%s\"", name, value.c_str());
+  if (auto file = configOpen(name, "w")) {
+    file.write(value.c_str(), value.length());
+    file.close();
+    return true;
+  }
+  return false;
+}
diff --git a/src/config.h b/src/config.h
new file mode 100644
index 0000000..b1a4a9a
--- /dev/null
+++ b/src/config.h
@@ -0,0 +1,12 @@
+#ifndef CONFIG_H
+#define CONFIG_H
+
+#include <WString.h>
+
+void configSetup();
+
+String configReadString(const char *name, const char *fallback);
+
+bool configWriteString(const char *name, const char *fallback, const String &value);
+
+#endif
diff --git a/src/io.cpp b/src/io.cpp
new file mode 100644
index 0000000..dcbdd49
--- /dev/null
+++ b/src/io.cpp
@@ -0,0 +1,7 @@
+#include "io.h"
+
+void buttonCallback(const Output &output, const ButtonEvent event) {
+  if (event == BUTTON_PRESSED) {
+    output.toggle();
+  }
+}
diff --git a/src/io.h b/src/io.h
new file mode 100644
index 0000000..5ce4547
--- /dev/null
+++ b/src/io.h
@@ -0,0 +1,55 @@
+#ifndef IO_H
+#define IO_H
+
+#include "Button.h"
+#include "Output.h"
+
+void buttonCallback(const Output &output, ButtonEvent event);
+
+inline Output relay1("RELAY #1", 12, false, true);
+
+inline Output relay2("RELAY #2", 5, false, true);
+
+inline Output relay3("RELAY #3", 4, false, true);
+
+inline Output relay4("RELAY #4", 15, false, true);
+
+inline Output status("Status", 13, true, false);
+
+inline Button button1(0, true, true, [](const ButtonEvent event) { buttonCallback(relay1, event); });
+
+inline Button button2(9, true, true, [](const ButtonEvent event) { buttonCallback(relay2, event); });
+
+inline Button button3(10, true, true, [](const ButtonEvent event) { buttonCallback(relay3, event); });
+
+inline Button button4(14, true, true, [](const ButtonEvent event) { buttonCallback(relay4, event); });
+
+inline void ioSetup() {
+  button1.setup();
+  button2.setup();
+  button3.setup();
+  button4.setup();
+
+  status.setup();
+
+  relay1.setup();
+  relay2.setup();
+  relay3.setup();
+  relay4.setup();
+}
+
+inline void ioLoop() {
+  button1.loop();
+  button2.loop();
+  button3.loop();
+  button4.loop();
+
+  status.loop();
+
+  relay1.loop();
+  relay2.loop();
+  relay3.loop();
+  relay4.loop();
+}
+
+#endif
diff --git a/src/main.cpp b/src/main.cpp
new file mode 100644
index 0000000..3b38c71
--- /dev/null
+++ b/src/main.cpp
@@ -0,0 +1,20 @@
+#include <ArduinoOTA.h>
+
+#include "config.h"
+#include "io.h"
+#include "wifi.h"
+
+void setup() {
+  delay(500);
+  Serial.begin(115200);
+  Serial.print("\n\n\nStartup!\n");
+
+  configSetup();
+  ioSetup();
+  wifiSetup();
+}
+
+void loop() {
+  ioLoop();
+  ArduinoOTA.handle();
+}
diff --git a/src/wifi.cpp b/src/wifi.cpp
new file mode 100644
index 0000000..963d2eb
--- /dev/null
+++ b/src/wifi.cpp
@@ -0,0 +1,63 @@
+#include "wifi.h"
+
+#include <ArduinoOTA.h>
+
+#include "config.h"
+#include "io.h"
+
+#define DEFAULT_HOSTNAME    "PatrixSonoff4ChPro"
+#define DEFAULT_WIFI_SSID   "HappyNet"
+#define DEFAULT_WIFI_PASS   "1Grausame!Sackratte7"
+
+void wifiChangeHostname(const char *hostname) {
+  if (configWriteString("hostname", DEFAULT_HOSTNAME, hostname)) {
+    WiFi.setHostname(hostname);
+    Serial.printf("Changed hostname to: %s\n", hostname);
+  }
+}
+
+void wifiChangeSSID(const char *ssid) {
+  if (configWriteString("wifiSSID", DEFAULT_WIFI_SSID, ssid)) {
+    Serial.printf("Changed SSID to: %s\n", ssid);
+  }
+}
+
+void wifiChangePassword(const char *password) {
+  configWriteString("wifiPass", DEFAULT_WIFI_PASS, password);
+  Serial.printf("Changed password\n");
+}
+
+void wifiSetup() {
+  const auto hostname = configReadString("hostname", DEFAULT_HOSTNAME);
+  const auto wifiSSID = configReadString("wifiSSID", DEFAULT_WIFI_SSID);
+  const auto wifiPass = configReadString("wifiPass", DEFAULT_WIFI_PASS);
+  WiFi.hostname(hostname);
+  WiFi.begin(wifiSSID, wifiPass);
+  while (WiFi.localIP() == 0UL) {
+    delay(500);
+    status.toggle();
+  }
+
+  yield();
+  status.set(false);
+  Serial.printf("Connected as \"%s\" (%s)\n", WiFi.hostname().c_str(), WiFi.localIP().toString().c_str());
+
+  ArduinoOTA.onStart([] {
+    Serial.println("OTA begin...");
+    status.set(true);
+  });
+  ArduinoOTA.onProgress([](const unsigned progress, const unsigned total) {
+    Serial.printf("OTA: %3d%%\r", 100 * progress / total);
+    status.toggle();
+  });
+  ArduinoOTA.onEnd([] {
+    Serial.println("\nOTA success!");
+    status.set(true);
+  });
+  ArduinoOTA.onError([](const ota_error_t error) {
+    Serial.printf("\nOTA error %u\n", error);
+    status.set(false);
+  });
+  ArduinoOTA.begin();
+  delay(1000);
+}
diff --git a/src/wifi.h b/src/wifi.h
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index 0000000..cb6cf16
--- /dev/null
+++ b/src/wifi.h
@@ -0,0 +1,12 @@
+#ifndef WIFI_H
+#define WIFI_H
+
+void wifiChangeHostname(const char *hostname);
+
+void wifiChangeSSID(const char *ssid);
+
+void wifiChangePassword(const char *password);
+
+void wifiSetup();
+
+#endif