Reorganized code, added google home intergrations and added zigbee2mqtt kettle

presence/presence.go

@@ -0,0 +1,50 @@
+package presence
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+
+	mqtt "github.com/eclipse/paho.mqtt.golang"
+)
+
+type Presence struct {
+	Presence chan bool
+	devices map[string]bool
+	current *bool
+}
+
+func New() Presence {
+	return Presence{Presence: make(chan bool), devices: make(map[string]bool), current: nil}
+}
+
+// Handler got automation/presence/+
+func (p *Presence) PresenceHandler(client mqtt.Client, msg mqtt.Message) {
+	name := strings.Split(msg.Topic(), "/")[2]
+	if len(msg.Payload()) == 0 {
+		// @TODO What happens if we delete a device that does not exist
+		delete(p.devices, name)
+	} else {
+		value, err := strconv.Atoi(string(msg.Payload()))
+		if err != nil {
+			panic(err)
+		}
+
+		p.devices[name] = value == 1
+	}
+
+	present := false
+	fmt.Println(p.devices)
+	for _, value := range p.devices {
+		if value {
+			present = true
+			break
+		}
+	}
+
+	if p.current == nil || *p.current != present {
+		p.current = &present
+		p.Presence <- present
+	}
+}
+