fix(gateway): replace UUID filter with manufacturer data preamble filter

gateway/gateway.py

@@ -113,22 +113,18 @@ class Gateway:
         log.info(f"Published to {topic} : {payload}")
 
     def on_device_found(self, device, adv_data):
-        """BLE scan callback — filters on Thingy:52 service UUID and decodes payload."""
-        uuids = [str(u).lower() for u in adv_data.service_uuids]
-        if self.service_uuid.lower() not in uuids:
+    """BLE scan callback — filters on Adrien's preamble (0xffff) in manufacturer data."""
+    if not adv_data.manufacturer_data:
         return
 
-        # Try manufacturer data first, then service data
-        raw = None
-        if adv_data.manufacturer_data:
     raw = list(adv_data.manufacturer_data.values())[0]
-        elif adv_data.service_data:
-            raw = list(adv_data.service_data.values())[0]
 
-        if raw is None:
-            log.debug(f"{device.address} | no payload data found")
+    # Filter on preamble 0xffff (company id defined in firmware spec)
+    if len(raw) < 2 or raw[0] != 0xff or raw[1] != 0xff:
         return
 
+    log.debug(f"{device.address} | Thingy detected, raw: {list(raw)}")
+
     data = self.decode_payload(raw)
     if not data:
         log.warning(f"{device.address} | empty decoded payload")