HELLO,
Platform information:
Hardware: Raspberry Pi 4
OS:openHABian
openHAB version: OpenHAB 2.5
I am trying to make MQTT connection between ESP32 and openHAB version 2.5
Someone please guide me with the steps to establish MQTT connection between ESP32 and openHAB
Arduino code for ESP32:
#include <ESP8266WiFi.h>
#include <PubSubClient.h>
//#include <WiFi.h>
#include <WiFiClient.h>
// Update these with values suitable for your network.
//#define status_led BUILTIN_LED
#define load1 2
#define input1 4
const char* ssid = âmakerdemy2â;
const char* password = âindia123â;
const char* mqtt_server = â192.168.1.5â;
WiFiClient espClient;
PubSubClient client(espClient);
IPAddress ip(192, 168, 1, 2);
IPAddress gateway_dns(192, 168, 1, 1);
long lastMsg = 0;
char msg[50];
int value = 0;
int last_pub_time=0;
void setup_wifi() {
delay(10);
// We start by connecting to a WiFi network
Serial.println();
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.config(ip, gateway_dns, gateway_dns);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
randomSeed(micros());
Serial.println("");
Serial.println(âWiFi connectedâ);
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
}
void callback(char* topic, byte* payload, unsigned int length) {
Serial.print(âMessage arrived [â);
Serial.print(topic);
Serial.print("] ");
for (int i = 0; i < length; i++) {
Serial.print((char)payload[i]);
}
if ((char)payload[0] == â1â)
digitalWrite(load1, HIGH);
else
digitalWrite(load1, LOW);
}
void reconnect() {
// Loop until weâre reconnected
while (!client.connected()) {
Serial.print(âAttempting MQTT connectionâŠâ);
// Create a random client ID
String clientId = âlens_RtyALk5DrbsZ62QgebwDxBBaJdBâ;
clientId += String(random(0xffff), HEX);
// Attempt to connect
if (client.connect(clientId.c_str(),âopenhabianâ, âopenhabianâ)) {
Serial.println(âconnectedâ);
// Once connected, publish an announcementâŠ
// client.publish(âoutTopicâ, âhello worldâ);
// ⊠and resubscribe
client.subscribe("/home/esp8266/switch/command");
} else {
Serial.print(âfailed, rc=â);
Serial.print(client.state());
Serial.println(" try again in 5 seconds");
// Wait 5 seconds before retrying
delay(5000);
}
}
}
void setup() {
// pinMode(status_led, OUTPUT);
pinMode(load1, OUTPUT);
pinMode(input1, INPUT_PULLUP);
Serial.begin(115200);
setup_wifi();
client.setServer(mqtt_server, 1883);
client.setCallback(callback);
}
void loop() {
if (!client.connected()) {
reconnect();
}
if(!digitalRead(input1) && (millis()- last_pub_time > 3000)){
last_pub_time=millis();
client.publish("/home/esp8266/switch/state",â1â);
}
client.loop();
}
Thanks in advance.