homeassistant: Automatically add shellies to mqtt

roles/homeassistant/templates/mqtt.yaml.j2

@@ -0,0 +1,13 @@
+---
+sensor:
+{% for shelly in shellies | selectattr("name", "match", "^shellyplug-s-") | list %}
+  - name: Power Usage
+    state_topic: home/{{ shelly["room"] }}/{{ shelly["device"] }}/relay/0/power
+    unique_id: {{ shelly["name"] }}
+    unit_of_measurement: W
+    device:
+      name: {{ shelly["device"] | capitalize }}
+      suggested_area: {{ shelly["room"] | replace("_", " ") | capitalize }}
+      identifiers:
+        - {{ shelly["name"] }}
+{% endfor %}