add hass_button_emulator.py with mqtt test

hass_button_emulator.py

@@ -0,0 +1,36 @@
+#!/bin/python
+
+import time
+import paho.mqtt.client as mqtt
+import json
+
+MQTT_SERVER_ADDRESS = "localhost"
+MQTT_SERVER_PORT = 1883
+MQTT_TOPIC = "homeassistant/device/mixer"
+
+
+def on_connect(client, userdata, flags, reason_code, properties):
+    print(f"Connected: {reason_code}")
+    client.subscribe("#")
+
+
+def on_message(client, userdata, msg):
+    print(f"{msg.topic}: {msg.payload.decode()}")
+
+
+client = mqtt.Client(callback_api_version=mqtt.CallbackAPIVersion.VERSION2)
+client.on_connect = on_connect
+client.on_message = on_message
+
+client.connect(MQTT_SERVER_ADDRESS, MQTT_SERVER_PORT, 60)
+client.loop_start()
+
+j = json.dumps({"command": "scene_recall", "args": {"scene_id": 42}})
+# j = json.dumps({'command': 'shutdown'})
+
+client.publish(MQTT_TOPIC, payload=j, qos=0, retain=False)
+
+time.sleep(2)
+
+client.loop_stop()
+client.disconnect()