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

gateway/gateway.py

@@ -41,6 +41,7 @@ class Gateway:
         )
 
         # Authentication — username from config, password from environment variable
+        # The password is never stored in config files or source code
         username = config["mqtt"].get("username")
         password = os.environ.get("MQTT_PASSWORD")
         if username:
@@ -113,25 +114,25 @@ class Gateway:
         log.info(f"Published to {topic} : {payload}")
 
     def on_device_found(self, device, adv_data):
-    """BLE scan callback — filters on Adrien's preamble (0xffff) in manufacturer data."""
+        """BLE scan callback — filters on Adrien's preamble (0xffff) in manufacturer data."""
-    if not adv_data.manufacturer_data:
+        if not adv_data.manufacturer_data:
-        return
+            return
 
-    raw = list(adv_data.manufacturer_data.values())[0]
+        raw = list(adv_data.manufacturer_data.values())[0]
 
-    # Filter on preamble 0xffff (company id defined in firmware spec)
+        # Filter on preamble 0xffff (company id defined in firmware spec)
-    if len(raw) < 2 or raw[0] != 0xff or raw[1] != 0xff:
+        if len(raw) < 2 or raw[0] != 0xff or raw[1] != 0xff:
-        return
+            return
 
-    log.debug(f"{device.address} | Thingy detected, raw: {list(raw)}")
+        log.debug(f"{device.address} | Thingy detected, raw: {list(raw)}")
 
-    data = self.decode_payload(raw)
+        data = self.decode_payload(raw)
-    if not data:
+        if not data:
-        log.warning(f"{device.address} | empty decoded payload")
+            log.warning(f"{device.address} | empty decoded payload")
-        return
+            return
 
-    log.debug(f"{device.address} | decoded: {data}")
+        log.debug(f"{device.address} | decoded: {data}")
-    self.publish(device.address, data)
+        self.publish(device.address, data)
 
     async def run(self):
         """Start passive BLE scan and run indefinitely."""