device announce feature

announce.go

@@ -0,0 +1,18 @@
+package hass
+
+import (
+	"encoding/json"
+
+	mqtt "github.com/eclipse/paho.mqtt.golang"
+)
+
+// <discovery_prefix>/<component>/[<node_id>/]<object_id>/config
+func AnnounceDevice(client mqtt.Client, prefix string, nodeid string, objectid string, device IConfig) error {
+	c, err := json.Marshal(device)
+	if err != nil {
+		return err
+	}
+	topic := prefix + "/" + device.GetComponent() + "/" + nodeid + "/" + objectid + "/config"
+	client.Publish(topic, 0, true, c)
+	return nil
+}