Ready for refactoring.

Writing this short example, shows that even w/ Go, you have to pack
the engine and devices somewhere. Yes this is not mandatory but you
ends up w/ this kind of code (check the wapper around the handler)

misc/devices_counter.go

 package main
 
 import (
+	"fmt"
 	"log/slog"
 	"strings"
 	"time"
@@ -19,9 +20,9 @@ type Counter struct {
 var (
 	devices     map[uuid.UUID]*Counter
 	deviceIcons = map[string]string{
-		"lamp":    "💡",
-		"contact": "🚪",
-		"motion":  "🚶",
+		"lamp":    " ",
+		"motion":  "󰶑 ",
+		"contact": "󰠚 ",
 	}
 )
 
@@ -69,18 +70,18 @@ func updateCounter(msg *xaal.Message, prefix string) {
 	if prefix == "lamp" {
 		cnt.State = getAttribute(msg, "light")
 	}
-	// Contacts
-	if prefix == "contact" {
-		cnt.State = getAttribute(msg, "detected")
-	}
 	// motion sensors
 	if prefix == "motion" {
 		cnt.State = getAttribute(msg, "presence")
 	}
+	// Contacts
+	if prefix == "contact" {
+		cnt.State = getAttribute(msg, "detected")
+	}
+
 	if cnt.State != old {
 		display()
 	}
-	// slog.Debug("Update counter", "cnt", cnt)
 }
 
 func updateAlive(msg *xaal.Message) {
@@ -91,14 +92,22 @@ func updateAlive(msg *xaal.Message) {
 	}
 }
 
+// display outputs the result on stdout and flush
 func display() {
-	slog.Info("Devices", "count", len(devices))
-	slog.Info("Lamps", "cnt", countPrefix("lamp"))
-	slog.Info("Motion", "cnt", countPrefix("motion"))
-	slog.Info("Contact", "cnt", countPrefix("contact"))
+	// slog.Info("Devices", "count", len(devices))
+	displayPrefix("lamp")
+	fmt.Print("  ")
+	displayPrefix("motion")
+	fmt.Print("  ")
+	displayPrefix("contact")
+	fmt.Print("\n")
 }
 
-func handleMessage(msg *xaal.Message) {
+func displayPrefix(prefix string) string {
+	return fmt.Sprintf("%s%d", deviceIcons[prefix], countPrefix(prefix))
+}
+
+func handleMessage(eng *xaal.Engine, msg *xaal.Message) {
 	// let's filter the messages we are interested in
 	prefix := filterCounter(msg)
 	if prefix == "" {
@@ -108,6 +117,7 @@ func handleMessage(msg *xaal.Message) {
 	cnt := getCounter(msg)
 	if cnt == nil {
 		cnt = addCounter(msg, prefix)
+		sendGetAttritube(eng, msg.Source)
 	}
 
 	if msg.IsAlive() {
@@ -129,6 +139,13 @@ func countPrefix(prefix string) int {
 	return total
 }
 
+func sendGetAttritube(eng *xaal.Engine, addr uuid.UUID) {
+	dev := schemas.NewHmi(uuid.Random())
+	body := make(xaal.MessageBody)
+	msg := eng.MessagesFactory.BuildMessage(dev, []uuid.UUID{addr}, xaal.MSGTypeRequest, string(xaal.MSGActionGetAttributes), body)
+	eng.Send(msg)
+}
+
 // isAlive sends a message to all devices asking if they are alive
 func isAlive(eng *xaal.Engine) {
 	addr := uuid.Random()
@@ -148,7 +165,11 @@ func main() {
 	eng.DisableMessageFilter()
 
 	devices = make(map[uuid.UUID]*Counter)
-	eng.Subscribe(handleMessage)
+	handleMessageWrapper := func(msg *xaal.Message) {
+		handleMessage(eng, msg)
+	}
+
+	eng.Subscribe(handleMessageWrapper)
 	isAlive(eng)
 	eng.Run()
 	// Let's count the devices