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- #include <ESP8266WiFi.h>
- #include <PubSubClient.h>
- #define LED1 2
- #define LED2 16
- // Update these with values suitable for your network.
- const char* ssid = "mywifi";
- const char* password = "123456789";
- //const char* mqtt_server = "broker.mqtt-dashboard.com";
- const char* mqtt_server = "192.168.1.6";
- WiFiClient espClient;
- PubSubClient client(espClient);
- unsigned long lastMsg = 0;
- #define MSG_BUFFER_SIZE (50)
- char msg[MSG_BUFFER_SIZE];
- int value = 20;
- void setup_wifi() {
- delay(10);
- // We start by connecting to a WiFi network
- Serial.println();
- Serial.print("Connecting to ");
- Serial.println(ssid);
- WiFi.mode(WIFI_STA);
- WiFi.begin(ssid, password);
- while (WiFi.status() != WL_CONNECTED) {
- delay(500);
- Serial.print(".");
- }
- randomSeed(micros());
- Serial.println("");
- Serial.println("WiFi connected");
- Serial.println("IP address: ");
- Serial.println(WiFi.localIP());
- }
- void callback(char* topic, byte* payload, unsigned int length) {
- Serial.print("Message arrived [");
- Serial.print(topic);
- Serial.print("] ");
- for (int i = 0; i < length; i++) {
- Serial.print((char)payload[i]);
- }
- Serial.println();
- if (strcmp(topic, "room/lamp1") == 0) {
- // Switch on the LED if an 1 was received as first character
- if ((char)payload[0] == '1') {
- digitalWrite(LED2, LOW); // Turn the LED on (Note that LOW is the voltage level
- } else {
- digitalWrite(LED2, HIGH); // Turn the LED off by making the voltage HIGH
- }
- }
- if (strcmp(topic, "room/lamp2") == 0) {
- // Switch on the LED if an 1 was received as first character
- if ((char)payload[0] == '1') {
- digitalWrite(LED1, LOW); // Turn the LED on (Note that LOW is the voltage level
- } else {
- digitalWrite(LED1, HIGH); // Turn the LED off by making the voltage HIGH
- }
- }
- }
- void reconnect() {
- // Loop until we're reconnected
- while (!client.connected()) {
- Serial.print("Attempting MQTT connection...");
- // Create a random client ID
- String clientId = "ESP8266Client-";
- clientId += String(random(0xffff), HEX);
- // Attempt to connect
- if (client.connect(clientId.c_str())) {
- Serial.println("connected");
- // Once connected, publish an announcement...
- client.publish("outTopic", "hello world");
- // ... and resubscribe
- client.subscribe("room/lamp1");
- client.subscribe("room/lamp2");
- } else {
- Serial.print("failed, rc=");
- Serial.print(client.state());
- Serial.println(" try again in 5 seconds");
- // Wait 5 seconds before retrying
- delay(5000);
- }
- }
- }
- void setup() {
- pinMode(LED1, OUTPUT);
- pinMode(LED2, OUTPUT);
- Serial.begin(115200);
- setup_wifi();
- client.setServer(mqtt_server, 1883);
- client.setCallback(callback);
- }
- void loop() {
- if (!client.connected()) {
- reconnect();
- }
- client.loop();
- unsigned long now = millis();
- if (now - lastMsg > 2000) {
- lastMsg = now;
- ++value;
- if (value > 40) {
- value = 20;
- }
- snprintf (msg, MSG_BUFFER_SIZE, "%ld C", value);
- Serial.print("Publish message: ");
- Serial.println(msg);
- client.publish("room/temp", msg);
- }
- }
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