splitting up some code responsibilitiy

extending the mq Message to have a type field

mqttcoms.go

@@ -0,0 +1,44 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"os"
+
+	MQTT "github.com/eclipse/paho.mqtt.golang"
+	mqtt "github.com/eclipse/paho.mqtt.golang"
+)
+
+// listens on topic for messages
+func listener(mqMessages chan mqtt.Message) {
+	opts := setupMQTT()
+	client := MQTT.NewClient(opts)
+	topic := "home/rgbboard"
+	if token := client.Connect(); token.Wait() && token.Error() != nil {
+		log.Println(fmt.Sprintf("failed to connect to mq: %s", token.Error().Error()))
+		panic(token.Error())
+	}
+	log.Println("connected")
+	client.Subscribe(topic, 0, func(client mqtt.Client, msg mqtt.Message) {
+		log.Println("Receiving ", string(msg.Payload()), " on topic: ", msg.Topic())
+		mqMessages <- msg
+	})
+}
+
+// connection lost management
+func onConnectionLostHandler(c MQTT.Client, reason error) {
+	log.Fatalf(reason.Error())
+}
+
+// setup connection to mqtt, topic to listen to, qos
+func setupMQTT() *mqtt.ClientOptions {
+	opts := MQTT.NewClientOptions()
+	opts.AddBroker(fmt.Sprintf("tcp://%s:%s", os.Getenv("MQTTBROKER"), os.Getenv("MQTTPORT")))
+	opts.SetUsername(os.Getenv("MQTTUSER"))
+	opts.SetPassword(os.Getenv("MQTTPASSWORD"))
+	opts.SetClientID("rgbboard")
+	opts.SetAutoReconnect(true)
+	opts.SetConnectionLostHandler(onConnectionLostHandler)
+
+	return opts
+}