Implemented handling of WiFi settings

include/Configuration.h

@@ -5,9 +5,23 @@
 #define CONFIG_FILENAME "/config.bin"
 #define CONFIG_VERSION 0x00010000 // 0.1.0
 
+#define WIFI_MAX_SSID_STRLEN 31
+#define WIFI_MAX_PASSWORD_STRLEN 31
+#define WIFI_MAX_HOSTNAME_STRLEN 31
+
 struct CONFIG_T {
     uint32_t Cfg_Version;
     uint Cfg_SaveCount;
+
+    char WiFi_Ssid[WIFI_MAX_SSID_STRLEN + 1];
+    char WiFi_Password[WIFI_MAX_PASSWORD_STRLEN + 1];
+    byte WiFi_Ip[4];
+    byte WiFi_Netmask[4];
+    byte WiFi_Gateway[4];
+    byte WiFi_Dns1[4];
+    byte WiFi_Dns2[4];
+    bool WiFi_Dhcp;
+    char WiFi_Hostname[WIFI_MAX_HOSTNAME_STRLEN + 1];
 };
 
 class ConfigurationClass {

include/WiFiSettings.h

@@ -0,0 +1,31 @@
+#pragma once
+
+#include <DNSServer.h>
+#include <memory>
+
+class WiFiSettingsClass {
+public:
+    WiFiSettingsClass();
+    void init();
+    void loop();
+    void applyConfig();
+    void enableAdminMode();
+    String getApName();
+
+private:
+    void setHostname();
+    void setStaticIp();
+    void setupMode();
+    bool adminEnabled = true;
+    bool forceDisconnection = false;
+    int adminTimeoutCounter = 0;
+    int connectTimeoutTimer = 0;
+    int connectRedoTimer = 0;
+    unsigned long lastTimerCall = 0;
+    const byte DNS_PORT = 53;
+    IPAddress apIp;
+    IPAddress apNetmask;
+    std::unique_ptr<DNSServer> dnsServer;
+};
+
+extern WiFiSettingsClass WiFiSettings;

include/defaults.h

@@ -1,3 +1,16 @@
 #pragma once
 
-#define SERIAL_BAUDRATE 115200
+#define SERIAL_BAUDRATE 115200
+
+#define APP_HOSTNAME "OpenDTU-%06X"
+
+#define ACCESS_POINT_NAME "OpenDTU-"
+#define ACCESS_POINT_PASSWORD "openDTU"
+
+#define ADMIN_TIMEOUT 180
+#define WIFI_RECONNECT_TIMEOUT 15
+#define WIFI_RECONNECT_REDO_TIMEOUT 600
+
+#define WIFI_SSID ""
+#define WIFI_PASSWORD ""
+#define WIFI_DHCP true

src/Configuration.cpp

@@ -1,4 +1,5 @@
 #include "Configuration.h"
+#include "defaults.h"
 #include <LittleFS.h>
 
 CONFIG_T config;
@@ -8,6 +9,12 @@ void ConfigurationClass::init()
     memset(&config, 0x0, sizeof(config));
     config.Cfg_SaveCount = 0;
     config.Cfg_Version = CONFIG_VERSION;
+
+    // WiFi Settings
+    strlcpy(config.WiFi_Ssid, WIFI_SSID, sizeof(config.WiFi_Ssid));
+    strlcpy(config.WiFi_Password, WIFI_PASSWORD, sizeof(config.WiFi_Password));
+    config.WiFi_Dhcp = WIFI_DHCP;
+    strlcpy(config.WiFi_Hostname, APP_HOSTNAME, sizeof(config.WiFi_Hostname));
 }
 
 bool ConfigurationClass::write()

src/WiFiSettings.cpp

@@ -0,0 +1,144 @@
+#include "WiFiSettings.h"
+#include "Configuration.h"
+#include "defaults.h"
+#include <WiFi.h>
+
+WiFiSettingsClass::WiFiSettingsClass()
+    : apIp(172, 217, 28, 1)
+    , apNetmask(255, 255, 255, 0)
+{
+    dnsServer.reset(new DNSServer());
+}
+
+void WiFiSettingsClass::init()
+{
+    setupMode();
+}
+
+void WiFiSettingsClass::setupMode()
+{
+    if (adminEnabled) {
+        WiFi.mode(WIFI_AP_STA);
+        String ssidString = getApName();
+        WiFi.softAPConfig(apIp, apIp, apNetmask);
+        WiFi.softAP((const char*)ssidString.c_str(), ACCESS_POINT_PASSWORD);
+        dnsServer->setErrorReplyCode(DNSReplyCode::NoError);
+        dnsServer->start(DNS_PORT, "*", WiFi.softAPIP());
+    } else {
+        dnsServer->stop();
+        WiFi.mode(WIFI_STA);
+    }
+}
+
+void WiFiSettingsClass::enableAdminMode()
+{
+    adminEnabled = true;
+    adminTimeoutCounter = 0;
+    setupMode();
+}
+
+String WiFiSettingsClass::getApName()
+{
+    uint32_t chipId = 0;
+    for (int i = 0; i < 17; i += 8) {
+        chipId |= ((ESP.getEfuseMac() >> (40 - i)) & 0xff) << i;
+    }
+    return String(ACCESS_POINT_NAME + String(chipId));
+}
+
+void WiFiSettingsClass::loop()
+{
+    if (millis() - lastTimerCall > 1000) {
+        adminTimeoutCounter++;
+        connectTimeoutTimer++;
+        connectRedoTimer++;
+        lastTimerCall = millis();
+    }
+    if (adminEnabled) {
+        // Don't disable the admin mode when WiFi is not available
+        if (WiFi.status() != WL_CONNECTED) {
+            adminTimeoutCounter = 0;
+        }
+        // If WiFi is connected to AP for more than ADMIN_TIMEOUT
+        // seconds, disable the internal Access Point
+        if (adminTimeoutCounter > ADMIN_TIMEOUT) {
+            adminEnabled = false;
+            Serial.println(F("Admin mode disabled"));
+            setupMode();
+        }
+        // It's nearly not possible to use the internal AP if the
+        // WiFi is searching for an AP. So disable searching afer
+        // WIFI_RECONNECT_TIMEOUT and repeat after WIFI_RECONNECT_REDO_TIMEOUT
+        if (WiFi.status() == WL_CONNECTED) {
+            connectTimeoutTimer = 0;
+            connectRedoTimer = 0;
+        } else {
+            if (connectTimeoutTimer > WIFI_RECONNECT_TIMEOUT && !forceDisconnection) {
+                Serial.print(F("Disable search for AP... "));
+                WiFi.mode(WIFI_AP);
+                Serial.println(F("done"));
+                connectRedoTimer = 0;
+                forceDisconnection = true;
+            }
+            if (connectRedoTimer > WIFI_RECONNECT_REDO_TIMEOUT && forceDisconnection) {
+                Serial.print(F("Enable search for AP... "));
+                WiFi.mode(WIFI_AP_STA);
+                Serial.println(F("done"));
+                applyConfig();
+                connectTimeoutTimer = 0;
+                forceDisconnection = false;
+            }
+        }
+    }
+    dnsServer->processNextRequest();
+}
+
+void WiFiSettingsClass::applyConfig()
+{
+    setHostname();
+    if (!strcmp(Configuration.get().WiFi_Ssid, "")) {
+        return;
+    }
+    Serial.print(F("Configuring WiFi STA using "));
+    if (strcmp(WiFi.SSID().c_str(), Configuration.get().WiFi_Ssid) || strcmp(WiFi.psk().c_str(), Configuration.get().WiFi_Password)) {
+        Serial.print(F("new credentials... "));
+        WiFi.begin(
+            Configuration.get().WiFi_Ssid,
+            Configuration.get().WiFi_Password);
+    } else {
+        Serial.print(F("existing credentials... "));
+        WiFi.begin();
+    }
+    Serial.println("done");
+    setStaticIp();
+}
+
+void WiFiSettingsClass::setHostname()
+{
+    Serial.print(F("Setting Hostname... "));
+    if (strcmp(Configuration.get().WiFi_Hostname, "")) {
+        if (WiFi.hostname(Configuration.get().WiFi_Hostname)) {
+            Serial.println(F("done"));
+        } else {
+            Serial.println(F("failed"));
+        }
+    } else {
+        Serial.println(F("failed (Hostname empty)"));
+    }
+}
+
+void WiFiSettingsClass::setStaticIp()
+{
+    if (!Configuration.get().WiFi_Dhcp) {
+        Serial.print(F("Configuring WiFi STA static IP... "));
+        WiFi.config(
+            IPAddress(Configuration.get().WiFi_Ip),
+            IPAddress(Configuration.get().WiFi_Gateway),
+            IPAddress(Configuration.get().WiFi_Netmask),
+            IPAddress(Configuration.get().WiFi_Dns1),
+            IPAddress(Configuration.get().WiFi_Dns2));
+        Serial.println(F("done"));
+    }
+}
+
+WiFiSettingsClass WiFiSettings;

src/main.cpp

@@ -1,4 +1,5 @@
 #include "Configuration.h"
+#include "WiFiSettings.h"
 #include "defaults.h"
 #include <Arduino.h>
 #include <LittleFS.h>
@@ -39,9 +40,12 @@ void setup()
 
     // Initialize WiFi
     Serial.print(F("Initialize WiFi... "));
+    WiFiSettings.init();
+    Serial.println(F("done"));
+    WiFiSettings.applyConfig();
 }
 
 void loop()
 {
-    // put your main code here, to run repeatedly:
+    WiFiSettings.loop();
 }