Created
April 19, 2023 03:01
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Connect arduino to mqtt broker
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| #include <ESP8266WiFi.h> | |
| #include <PubSubClient.h> | |
| // WiFi | |
| const char *ssid = "mousse"; // Enter your WiFi name | |
| const char *password = "qweqweqwe"; // Enter WiFi password | |
| // MQTT Broker | |
| const char *mqtt_broker = "broker.emqx.io"; | |
| const char *topic = "esp8266/test"; | |
| const char *mqtt_username = "emqx"; | |
| const char *mqtt_password = "public"; | |
| const int mqtt_port = 1883; | |
| WiFiClient espClient; | |
| PubSubClient client(espClient); | |
| void setup() { | |
| // Set software serial baud to 115200; | |
| Serial.begin(115200); | |
| // connecting to a WiFi network | |
| WiFi.begin(ssid, password); | |
| while (WiFi.status() != WL_CONNECTED) { | |
| delay(500); | |
| Serial.println("Connecting to WiFi.."); | |
| } | |
| Serial.println("Connected to the WiFi network"); | |
| //connecting to a mqtt broker | |
| client.setServer(mqtt_broker, mqtt_port); | |
| client.setCallback(callback); | |
| while (!client.connected()) { | |
| String client_id = "esp8266-client-"; | |
| client_id += String(WiFi.macAddress()); | |
| Serial.printf("The client %s connects to the public mqtt broker\n", client_id.c_str()); | |
| if (client.connect(client_id.c_str(), mqtt_username, mqtt_password)) { | |
| Serial.println("Public emqx mqtt broker connected"); | |
| } else { | |
| Serial.print("failed with state "); | |
| Serial.print(client.state()); | |
| delay(2000); | |
| } | |
| } | |
| // publish and subscribe | |
| client.publish(topic, "hello emqx"); | |
| client.subscribe(topic); | |
| } | |
| void callback(char *topic, byte *payload, unsigned int length) { | |
| Serial.print("Message arrived in topic: "); | |
| Serial.println(topic); | |
| Serial.print("Message:"); | |
| for (int i = 0; i < length; i++) { | |
| Serial.print((char) payload[i]); | |
| } | |
| Serial.println(); | |
| Serial.println("-----------------------"); | |
| } | |
| void loop() { | |
| client.loop(); | |
| } |
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