diff --git a/apps/abstraction/vendors/test.py b/apps/abstraction/vendors/test.py
new file mode 100644
index 0000000..a25a7bb
--- /dev/null
+++ b/apps/abstraction/vendors/test.py
@@ -0,0 +1,62 @@
+"""test vendor transformations."""
+
+import json
+import logging
+from typing import Any
+
+logger = logging.getLogger(__name__)
+
+
+def transform_contact_sensor_to_vendor(payload: dict[str, Any]) -> str:
+    """Transform abstract contact sensor payload to MAX! 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]:
+    try:
+        contact_value = payload.strip().lower()
+        return {
+            "contact": "open" if (contact_value == "open") else "closed"
+        }
+    except (ValueError, TypeError) as e:
+        logger.error(f"contact sensor failed to parse: {payload}, error: {e}")
+        return {"contact": "closed"}
+
+
+def transform_thermostat_to_vendor(payload: dict[str, Any]) -> str:
+    if "target" not in payload:
+        logger.warning(f"thermostat payload missing 'target': {payload}")
+        return "21"
+    
+    target_temp = payload["target"]
+    
+    if isinstance(target_temp, (int, float)):
+        int_temp = int(round(target_temp))
+        return str(int_temp)
+    
+    logger.warning(f"invalid target temperature type: {type(target_temp)}")
+    return "21"
+
+
+def transform_thermostat_to_abstract(payload: str) -> dict[str, Any]:
+    target_temp = float(payload.strip())
+    
+    return {
+        "target": target_temp,
+        "mode": "heat"
+    }
+
+
+# Registry of handlers for this vendor
+HANDLERS = {
+    ("contact_sensor", "to_vendor"): transform_contact_sensor_to_vendor,
+    ("contact_sensor", "to_abstract"): transform_contact_sensor_to_abstract,
+    ("contact", "to_vendor"): transform_contact_sensor_to_vendor,
+    ("contact", "to_abstract"): transform_contact_sensor_to_abstract,
+    ("thermostat", "to_vendor"): transform_thermostat_to_vendor,
+    ("thermostat", "to_abstract"): transform_thermostat_to_abstract,
+}
diff --git a/config/devices.yaml b/config/devices.yaml
index 3380666..47c18bf 100644
--- a/config/devices.yaml
+++ b/config/devices.yaml
@@ -466,6 +466,21 @@ devices:
     model: "MAX! Thermostat"
     peer_id: "41"
     channel: "1"
+- device_id: thermostat_bad_unten
+  homekit_aid: 31
+  name: Heizung
+  type: thermostat
+  cap_version: "thermostat@1.0.0"
+  technology: zigbee2mqtt
+  features:
+    heating: true
+    temperature_range:
+    - 5
+    - 30
+    temperature_step: 0.5
+  topics:
+    state: "zigbee2mqtt/0x003c84fffebdcc28"
+    set: "zigbee2mqtt/0x003c84fffebdcc28/set"
 - device_id: sterne_wohnzimmer
   homekit_aid: 32
   name: Sterne
@@ -1137,19 +1152,3 @@ devices:
   topics:
     state: "zigbee2mqtt/0x842e14fffefe4ba4"
     set: "zigbee2mqtt/0x842e14fffefe4ba4/set"
-
-- device_id: thermostat_bad_unten
-  homekit_aid: 31
-  name: Heizung
-  type: thermostat
-  cap_version: "thermostat@1.0.0"
-  technology: zigbee2mqtt
-  features:
-    heating: true
-    temperature_range:
-    - 5
-    - 30
-    temperature_step: 0.5
-  topics:
-    state: "zigbee2mqtt/0x003c84fffebdcc28"
-    set: "zigbee2mqtt/0x003c84fffebdcc28/set"
\ No newline at end of file
diff --git a/config/rules.yaml b/config/rules.yaml
index 54a95ef..9cdc7c2 100644
--- a/config/rules.yaml
+++ b/config/rules.yaml
@@ -9,7 +9,11 @@ rules:
     thermostats:
     - thermostat_bad_unten
   params:
+<<<<<<< HEAD
     eco_target: 6.0
+=======
+    eco_target: 5.0
+>>>>>>> main
     open_min_secs: 20
     close_min_secs: 20
 - id: window_setback_esszimmer
@@ -23,7 +27,11 @@ rules:
     thermostats:
     - thermostat_esszimmer
   params:
+<<<<<<< HEAD
     eco_target: 6.0
+=======
+    eco_target: 5.0
+>>>>>>> main
     open_min_secs: 20
     close_min_secs: 20
     previous_target_ttl_secs: 86400
@@ -38,7 +46,11 @@ rules:
     thermostats:
     - thermostat_wohnzimmer
   params:
+<<<<<<< HEAD
     eco_target: 6.0
+=======
+    eco_target: 5.0
+>>>>>>> main
     open_min_secs: 20
     close_min_secs: 20
     previous_target_ttl_secs: 86400
@@ -55,7 +67,11 @@ rules:
     thermostats:
     - thermostat_kueche
   params:
+<<<<<<< HEAD
     eco_target: 6.0
+=======
+    eco_target: 5.0
+>>>>>>> main
     open_min_secs: 20
     close_min_secs: 20
     previous_target_ttl_secs: 86400
@@ -71,7 +87,11 @@ rules:
     thermostats:
     - thermostat_patty
   params:
+<<<<<<< HEAD
     eco_target: 6.0
+=======
+    eco_target: 5.0
+>>>>>>> main
     open_min_secs: 20
     close_min_secs: 20
     previous_target_ttl_secs: 86400
@@ -85,7 +105,11 @@ rules:
     thermostats:
     - thermostat_schlafzimmer
   params:
+<<<<<<< HEAD
     eco_target: 6.0
+=======
+    eco_target: 5.0
+>>>>>>> main
     open_min_secs: 20
     close_min_secs: 20
     previous_target_ttl_secs: 86400
@@ -99,7 +123,11 @@ rules:
     thermostats:
     - thermostat_wolfgang
   params:
+<<<<<<< HEAD
     eco_target: 6.0
+=======
+    eco_target: 5.0
+>>>>>>> main
     open_min_secs: 20
     close_min_secs: 20
 - id: window_setback_bad_oben
@@ -112,6 +140,10 @@ rules:
     thermostats:
     - thermostat_bad_oben
   params:
+<<<<<<< HEAD
     eco_target: 6.0
+=======
+    eco_target: 5.0
+>>>>>>> main
     open_min_secs: 20
     close_min_secs: 20