Implement OTA update functionality with configuration and response handling; add necessary protobuf definitions and update main loop integration

lib/ota/ota_update.cpp

@@ -0,0 +1,85 @@
+#include "ota_update.hpp"
+
+OtaUpdate::OtaUpdate()
+    : _server(80), _httpUpdater(), _configured(false), _startTime(0) {
+}
+
+bool OtaUpdate::configure(const hardware_SensorOTAEnable& config) {
+    _config = config;
+    _configured = true;
+    _startTime = millis();
+
+    // Disconnect if already connected
+    WiFi.disconnect();
+    delay(100);
+
+    if (_config.as_station_mode) {
+        // STA mode
+        WiFi.mode(WIFI_STA);
+        WiFi.begin(_config.ssid, _config.password);
+
+        Serial.print("Connecting to WiFi STA: ");
+        Serial.println(_config.ssid);
+
+        unsigned long startAttempt = millis();
+        while (WiFi.status() != WL_CONNECTED && millis() - startAttempt < 10000) {
+            delay(500);
+            Serial.print(".");
+        }
+
+        if (WiFi.status() != WL_CONNECTED) {
+            Serial.println("Failed to connect to WiFi");
+            _configured = false;
+            return false;
+        }
+
+        if (_config.use_static_ip) {
+            IPAddress ip, gateway, subnet;
+            ip.fromString(_config.static_ip);
+            gateway.fromString(_config.gateway);
+            subnet.fromString(_config.netmask);
+            WiFi.config(ip, gateway, subnet);
+        }
+
+        Serial.println("");
+        Serial.print("Connected to ");
+        Serial.println(_config.ssid);
+        Serial.print("IP address: ");
+        Serial.println(WiFi.localIP());
+    } else {
+        // AP mode
+        WiFi.mode(WIFI_AP);
+        WiFi.softAP(_config.ssid, _config.password);
+
+        Serial.print("Started AP: ");
+        Serial.println(_config.ssid);
+        Serial.print("IP address: ");
+        Serial.println(WiFi.softAPIP());
+    }
+
+    // Setup HTTP Update Server
+    _httpUpdater.setup(&_server);
+    _server.begin();
+    Serial.println("HTTP Update Server started");
+
+    return true;
+}
+
+void OtaUpdate::update() {
+    if (!_configured) return;
+
+    _server.handleClient();
+
+    // Check timeout
+    if (_config.timeout_seconds > 0 && millis() - _startTime > _config.timeout_seconds * 1000) {
+        Serial.println("OTA timeout, disabling WiFi");
+        disable();
+    }
+}
+
+void OtaUpdate::disable() {
+    _server.stop();
+    WiFi.disconnect();
+    _configured = false;
+    Serial.println("OTA disabled");
+}