Hottis PV Modbus sensor

apps/abstraction/vendors/hottis_pv_modbus.py

@@ -23,17 +23,40 @@ def transform_relay_to_vendor(payload: dict[str, Any]) -> str:
 def transform_relay_to_abstract(payload: str) -> dict[str, Any]:
     """Transform Hottis Modbus relay payload to abstract format.
     
-    Hottis Modbus sends JSON like:
-    {"status": "Ok", "timestamp": "...", "state": false, "cnt": 528}
+    Hottis Modbus sends plain text 'on' or 'off'.
+    Example:
+    - Hottis PV Modbus: 'on'
+    - Abstract: {'power': 'on'}
+    """
+    return {"power": payload.strip()}
+
+def transform_contact_sensor_to_vendor(payload: dict[str, Any]) -> str:
+    """Transform abstract contact sensor payload to format.
+    
+    Contact sensors are read-only.
+    """
+    logger.warning("Contact sensors are read-only - SET commands should not be used")
+    return json.dumps(payload)
+
+
+def transform_contact_sensor_to_abstract(payload: str) -> dict[str, Any]:
+    """Transform contact sensor payload to abstract format.
+    
+    MAX! sends "true"/"false" (string or bool) on STATE topic.
     
     Transformations:
-    - state: true  -> power: 'on'
-    - state: false -> power: 'off'
+    - "true" or True -> "open" (window/door open)
+    - "false" or False -> "closed" (window/door closed)
+    
+    Example:
+    - contact sensor: "off"
+    - Abstract: {"contact": "open"}
     """
-    data = json.loads(payload)
-    state = data.get("state", False)
-    power = "on" if bool(state) else "off"
-    return {"power": power}
+    contact_value = payload.strip().lower() == "off"
+    return {
+        "contact": "open" if contact_value else "closed"
+    }
+
 
 
 def transform_three_phase_powermeter_to_vendor(payload: dict[str, Any]) -> str:

config/devices.yaml

@@ -860,7 +860,6 @@ devices:
   topics:
     set: "IoT/Car/Control"
     state: "IoT/Car/Control/State"
-
 - device_id: powermeter_caroutlet
   name: Car Outlet
   type: three_phase_powermeter
@@ -868,6 +867,13 @@ devices:
   technology: hottis_pv_modbus
   topics:
     state: "IoT/Car/Values"
+- device_id: sensor_caroutlet
+  name: Car Outlet
+  type: contact
+  cap_version: contact_sensor@1.0.0
+  technology: hottis_pv_modbus
+  topics:
+    state: IoT/Car/Feedback/State
 
 - device_id: schranklicht_flur_vor_kueche
   name: Schranklicht Flur vor Küche

config/layout.yaml

@@ -321,5 +321,9 @@ rooms:
     title: Ladestrom
     icon: 📊
     rank: 320
+  - device_id: sensor_caroutlet
+    title: Ladestrom
+    icon: 🪟
+    rank: 330