WeMOS: MQTT

Sumber: https://techtutorialsx.com/2017/04/09/esp8266-connecting-to-mqtt-broker/

Code

#include <ESP8266WiFi.h>
#include <PubSubClient.h>
 
const char* ssid = "o";
const char* password =  "";
const char* mqttServer = "192.168.0.192";
const int mqttPort = 1883;
# pastikan MQTT allow user anonymous
const char* mqttUser = "";
const char* mqttPassword = "";
 
WiFiClient espClient;
PubSubClient client(espClient);
 
void setup() {
  Serial.begin(115200);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.println("Connecting to WiFi..");
  }
  Serial.println("Connected to the WiFi network");
 
  client.setServer(mqttServer, mqttPort);
  client.setCallback(callback);
 
  while (!client.connected()) {
    Serial.println("Connecting to MQTT...");
 
//  if (client.connect("ESP8266Client", mqttUser, mqttPassword )) {
    if (client.connect("ESP8266Client" )) {
      
      Serial.println("connected");  
 
    } else {
      Serial.print("failed with state ");
      Serial.print(client.state());
      delay(2000);
    }
  }
  client.publish("test", "Hello from ESP8266");
  client.subscribe("test");
}
 
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();
}

ERROR: Publish

Check code di bawah ini,

void reconnect()
{
  while (!client.connected())
  {
    debugI("Reconnecting");
    if (!client.connect(HOST_NAME, MQTT_USER, MQTT_PW))
    {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" retrying in 5 seconds");
      debugV("failed, rc=%d retrying in 5 seconds",client.state());
      delay(5000);
    }
  }
}

void loop() {
  // put your main code here, to run repeatedly:
  StaticJsonDocument<200> doc;
  ArduinoOTA.handle();
  Debug.handle();

  if (!client.connected())
  {
    reconnect();
  }
  client.loop();
  sleepcount+=1;
  if(sleepcount >= 60)
  {
	// code to build pubMsg removed  
    client.publish("sensors/bme680", pubMsg);
    digitalWrite(LED, LOW);  //Led port ausschalten
    delay(500);             //500ms Pause
    digitalWrite(LED, HIGH); //Led port einschalten
    sleepcount=0;
  }	
  delay(sleeptime);
}

Ubuntu

Untuk Subscribe

mosquitto_sub -h 192.168.0.163 -t test

Untuk Posting

mosquitto_pub -h 192.168.0.163 -t test -m "coba echo"

Pranala Menarik

• WeMOS