attempt at receiving message for board

main.go

@@ -13,6 +13,7 @@ import (
 	rgbmatrix "gitea.wagshome.duckdns.org/publicWagsHome/go-rpi-rgb-led-matrix"
 	"github.com/disintegration/imaging"
 	MQTT "github.com/eclipse/paho.mqtt.golang"
+	mqtt "github.com/eclipse/paho.mqtt.golang"
 	"github.com/fogleman/gg"
 )
 
@@ -25,6 +26,7 @@ type Animation struct {
 	stroke   int
 	image    []image.Image
 	updown   int
+	msg      chan mqtt.Message
 }
 
 var (
@@ -66,26 +68,38 @@ func main() {
 	}*/
 	m, err := rgbmatrix.NewRGBLedMatrix(config)
 	fatal(err)
-
+	mqMessages := make(chan mqtt.Message)
+	go listener(mqMessages)
 	tk := rgbmatrix.NewToolKit(m)
 	defer tk.Close()
-
-	tk.PlayAnimation(NewAnimation(image.Point{64, 32}))
+	go animator(tk, mqMessages)
 }
 
-func setupMQTT() {
+func listener(mqMessages chan mqtt.Message) {
+	opts := setupMQTT()
+	client := MQTT.NewClient(opts)
+	topic := "home/rgbboard"
+	if token := client.Connect(); token.Wait() && token.Error() != nil {
+		panic(token.Error())
+	}
+	client.Subscribe(topic, 0, func(client mqtt.Client, msg mqtt.Message) {
+		log.Println("Receiving ", string(msg.Payload()), " on topic: ", msg.Topic())
+		mqMessages <- msg
+	})
+}
+
+func animator(tk *rgbmatrix.ToolKit, mqMessages chan mqtt.Message) {
+
+	tk.PlayAnimation(NewAnimation(image.Point{64, 32}, mqMessages))
+
+}
+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("MQTTPASS"))
-	opts.SetDefaultPublishHandler(messagePubHandler)
-	opts.OnConnect = connectHandler
-	opts.OnConnectionLost = connectLostHandler
-	client := MQTT.NewClient(opts)
-	if token := client.Connect(); token.Wait() && token.Error() != nil {
-		panic(token.Error())
-	}
 
+	return opts
 }
 func init() {
 	flag.Parse()
@@ -97,7 +111,7 @@ func fatal(err error) {
 	}
 }
 
-func NewAnimation(sz image.Point) *Animation {
+func NewAnimation(sz image.Point, mqMessages chan mqtt.Message) *Animation {
 	reader, err := os.Open("marioUp.png")
 	if err != nil {
 		log.Fatal(err)
@@ -123,6 +137,7 @@ func NewAnimation(sz image.Point) *Animation {
 		stroke: 8,
 		image:  images,
 		updown: 0,
+		msg:    mqMessages,
 	}
 }
 
@@ -136,7 +151,11 @@ func (a *Animation) Next() (image.Image, <-chan time.Time, error) {
 		a.ctx.DrawImageAnchored(imaging.FlipH(a.image[a.updown]), a.position.X, a.position.Y, 0.5, 0.5)
 	}
 	a.ctx.SetColor(color.White)
-	a.ctx.DrawString("mario", 5, 9)
+	select {
+	case msg := <-a.msg:
+		a.ctx.DrawString(string(msg.Payload()), 5, 9)
+	default:
+	}
 	return a.ctx.Image(), time.After(time.Millisecond * 50), nil
 }