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66 lines
1.8 KiB
66 lines
1.8 KiB
// Summer School 2022
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// ESP32 test code for MQTT protocol using
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// a free MQTT broker by emqx
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// Gerardo Marx
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#include <WiFi.h>
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#include <PubSubClient.h>
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// WiFi configuration
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const char *ssid = "Haus2.4G"; // WiFi name
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const char *password = "7476Haus#CB2040$"; // WiFi password
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WiFiClient espClient;
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// mqtt brocker:
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const char *mqttBrocker = "broker.emqx.io";
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const char *topic = "esp32/test";
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const char *mqttUsername = "emqx";
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const char *mqttPassword = "public";
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const int mqttPort = 1883;
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PubSubClient client(espClient);
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void setup(){
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//serial communication
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Serial.begin(115200);
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WiFi.begin(ssid, password);
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while(WiFi.status() != WL_CONNECTED){
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delay(500);
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Serial.print("Connecting to ");
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Serial.println(ssid);
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}
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Serial.println("Connection done.");
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//connecting to a mqtt brocker:
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client.setServer(mqttBrocker, mqttPort);
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client.setCallback(callback);
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while(!client.connected()){
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String clientID = "esp32-gmarx-";
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clientID += String(WiFi.macAddress());
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Serial.printf("The %s tries to connect to mqtt borcker...\n",clientID.c_str());
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if(client.connect(clientID.c_str(), mqttUsername, mqttPassword)){
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Serial.println("mqtt brocker connected");
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}
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else {
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Serial.print("mqtt connection failed");
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Serial.println(client.state());
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delay(2000);
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}
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}
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//once connected publish and suscribe:
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client.publish(topic, "Hi EMQX broker I'm a ESP32 :)");
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client.subscribe(topic);
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}
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void loop(){
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client.loop();
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}
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void callback(char *topic, byte *payload, unsigned int length){
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Serial.print("Message recived in topic: ");
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Serial.println(topic);
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Serial.print("The message is: ");
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for(int i=0;i<length; i++){
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Serial.print((char) payload[i]);
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}
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Serial.println();
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Serial.println("-+-+-+End+-+-+-+");
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}
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