/* * ESP8266 Web server with Web Socket to control an LED. * * The web server keeps all clients' LED status up to date and any client may * turn the LED on or off. * * For example, clientA connects and turns the LED on. This changes the word * "LED" on the web page to the color red. When clientB connects, the word * "LED" will be red since the server knows the LED is on. When clientB turns * the LED off, the word LED changes color to black on clientA and clientB web * pages. * * References: * * https://github.com/Links2004/arduinoWebSockets * */ #include #include #include #include #include #include static const char ssid[] = "***********"; static const char password[] = "*************"; MDNSResponder mdns; static void writeLED(bool); ESP8266WiFiMulti WiFiMulti; ESP8266WebServer server(80); WebSocketsServer webSocket = WebSocketsServer(81); static const char PROGMEM INDEX_HTML[] = R"rawliteral( ESP8266 WebSocket Demo

ESP8266 WebSocket Demo

LED

)rawliteral"; // GPIO#0 is for Adafruit ESP8266 HUZZAH board. Your board LED might be on 13. const int LEDPIN = 0; // Current LED status bool LEDStatus; // Commands sent through Web Socket const char LEDON[] = "ledon"; const char LEDOFF[] = "ledoff"; void webSocketEvent(uint8_t num, WStype_t type, uint8_t * payload, size_t length) { Serial.printf("webSocketEvent(%d, %d, ...)\r\n", num, type); switch(type) { case WStype_DISCONNECTED: Serial.printf("[%u] Disconnected!\r\n", num); break; case WStype_CONNECTED: { IPAddress ip = webSocket.remoteIP(num); Serial.printf("[%u] Connected from %d.%d.%d.%d url: %s\r\n", num, ip[0], ip[1], ip[2], ip[3], payload); // Send the current LED status if (LEDStatus) { webSocket.sendTXT(num, LEDON, strlen(LEDON)); } else { webSocket.sendTXT(num, LEDOFF, strlen(LEDOFF)); } } break; case WStype_TEXT: Serial.printf("[%u] get Text: %s\r\n", num, payload); if (strcmp(LEDON, (const char *)payload) == 0) { writeLED(true); } else if (strcmp(LEDOFF, (const char *)payload) == 0) { writeLED(false); } else { Serial.println("Unknown command"); } // send data to all connected clients webSocket.broadcastTXT(payload, length); break; case WStype_BIN: Serial.printf("[%u] get binary length: %u\r\n", num, length); hexdump(payload, length); // echo data back to browser webSocket.sendBIN(num, payload, length); break; default: Serial.printf("Invalid WStype [%d]\r\n", type); break; } } void handleRoot() { server.send_P(200, "text/html", INDEX_HTML); } void handleNotFound() { String message = "File Not Found\n\n"; message += "URI: "; message += server.uri(); message += "\nMethod: "; message += (server.method() == HTTP_GET)?"GET":"POST"; message += "\nArguments: "; message += server.args(); message += "\n"; for (uint8_t i=0; i 0; t--) { Serial.printf("[SETUP] BOOT WAIT %d...\r\n", t); Serial.flush(); delay(1000); } WiFiMulti.addAP(ssid, password); while(WiFiMulti.run() != WL_CONNECTED) { Serial.print("."); delay(100); } Serial.println(""); Serial.print("Connected to "); Serial.println(ssid); Serial.print("IP address: "); Serial.println(WiFi.localIP()); if (mdns.begin("espWebSock", WiFi.localIP())) { Serial.println("MDNS responder started"); mdns.addService("http", "tcp", 80); mdns.addService("ws", "tcp", 81); } else { Serial.println("MDNS.begin failed"); } Serial.print("Connect to http://espWebSock.local or http://"); Serial.println(WiFi.localIP()); server.on("/", handleRoot); server.onNotFound(handleNotFound); server.begin(); webSocket.begin(); webSocket.onEvent(webSocketEvent); } void loop() { webSocket.loop(); server.handleClient(); }