From bd1f3bc8c920e86c84469f83252da7cecf2b4ba3 Mon Sep 17 00:00:00 2001
From: Wolfgang Hottgenroth <wolfgang.hottgenroth@icloud.com>
Date: Tue, 9 Dec 2025 11:57:49 +0100
Subject: [PATCH] Hottis PV Modbus sensor

---
 apps/abstraction/vendors/hottis_pv_modbus.py | 28 ++++++++++++++++++++
 config/devices.yaml                          |  8 +++++-
 config/layout.yaml                           |  4 +++
 3 files changed, 39 insertions(+), 1 deletion(-)

diff --git a/apps/abstraction/vendors/hottis_pv_modbus.py b/apps/abstraction/vendors/hottis_pv_modbus.py
index a0a378a..772ae1a 100644
--- a/apps/abstraction/vendors/hottis_pv_modbus.py
+++ b/apps/abstraction/vendors/hottis_pv_modbus.py
@@ -30,6 +30,34 @@ def transform_relay_to_abstract(payload: str) -> dict[str, Any]:
     """
     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:
+    - "true" or True -> "open" (window/door open)
+    - "false" or False -> "closed" (window/door closed)
+    
+    Example:
+    - contact sensor: "off"
+    - Abstract: {"contact": "open"}
+    """
+    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:
     """Transform abstract three_phase_powermeter payload to hottis_pv_modbus format."""
diff --git a/config/devices.yaml b/config/devices.yaml
index 7790145..49aa8af 100644
--- a/config/devices.yaml
+++ b/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
diff --git a/config/layout.yaml b/config/layout.yaml
index aacf0c1..02bde6a 100644
--- a/config/layout.yaml
+++ b/config/layout.yaml
@@ -321,5 +321,9 @@ rooms:
     title: Ladestrom
     icon: 📊
     rank: 320
+  - device_id: sensor_caroutlet
+    title: Ladestrom
+    icon: 🪟
+    rank: 330