mqtt_client.py: add auto discovery for home assistant

mqtt_client.py

@@ -7,15 +7,38 @@ import paho.mqtt.client as mqtt
 import mixer
 from mixer import Mixer
 
+
 MQTT_SERVER_PORT = 1883
-MQTT_TOPIC = "homeassistant/device/mixer"
+MQTT_DISCOVERY_TOPIC = "homeassistant/button/mixer/config"
+MQTT_COMMAND_TOPIC = "livingroom/voc/allen_heath_qu16_mixer"
 
 m: Mixer = None
 
 
+def mqtt_autodiscovery(client):
+    j = json.dumps(
+        {
+            "name": "Reset Settings",
+            "command_topic": MQTT_COMMAND_TOPIC,
+            "command_template": '{"command": "scene_recall", "args": {"scene_id": 0}}',
+            "device": {
+                "name": "Mischpult",
+                "model": "Qu-16",
+                "manufacturer": "Allen & Heath",
+                "suggested_area": "livingroom",
+                "identifiers": "Mischpult",
+            },
+            "unique_id": "mischpult_reset_settings",
+        }
+    )
+
+    client.publish(MQTT_DISCOVERY_TOPIC, payload=j, qos=0, retain=False)
+
+
 def on_connect(client, userdata, flags, reason_code, properties):
     print(f"Connected: {reason_code}")
-    client.subscribe(MQTT_TOPIC)
+    client.subscribe(MQTT_COMMAND_TOPIC)
+    mqtt_autodiscovery(client)
 
 
 def on_message(client, userdata, msg):