main.go

package mqttclient

import (
	"fmt"
	"os"

	mqtt "github.com/eclipse/paho.mqtt.golang"
	"jonasled.dev/jonasled/ems-esp-logger/helper"
	"jonasled.dev/jonasled/ems-esp-logger/log"
)

var messagePubHandler mqtt.MessageHandler = func(client mqtt.Client, msg mqtt.Message) {
	log.Log.Debugf("Received message: %s from topic: %s\n", msg.Payload(), msg.Topic())
}

var messagePubHandlerBoiler mqtt.MessageHandler = func(client mqtt.Client, msg mqtt.Message) {
	log.Log.Debugf("Received message for boiler: %s from topic: %s\n", msg.Payload(), msg.Topic())

}

var connectHandler mqtt.OnConnectHandler = func(client mqtt.Client) {
	log.Log.Info("Successfully connected to MQTT broker")
}

var connectLostHandler mqtt.ConnectionLostHandler = func(client mqtt.Client, err error) {
	log.Log.Error("Connection to MQTT broker lost: ", err.Error())
}

func Init() {
	opts := mqtt.NewClientOptions()
	opts.AddBroker(fmt.Sprintf("tcp://%s:%s", os.Getenv("MQTT_HOST"), os.Getenv("MQTT_PORT")))
	opts.SetClientID("ems-esp-logger_" + helper.GenerateRandomString(8))
	if os.Getenv("MQTT_USERNAME") != "" {
		opts.SetUsername(os.Getenv("MQTT_USERNAME"))
		opts.SetPassword(os.Getenv("MQTT_PASSWORD"))
	}
	opts.SetDefaultPublishHandler(messagePubHandler)
	opts.OnConnect = connectHandler
	opts.OnConnectionLost = connectLostHandler
	client := mqtt.NewClient(opts)
	if token := client.Connect(); token.Wait() && token.Error() != nil {
		log.Log.Fatal("Failed connecting to MQTT server: ", token.Error())
	}
	client.Subscribe(os.Getenv("MQTT_TOPTIC_BOILER"), 1, messagePubHandlerBoiler)
}