add another timeout check on read_data

api/ble.py

@@ -38,6 +38,7 @@ SCAN_TIMEOUT   = 10.0   # seconds to scan for each MAC
 CONNECT_TIMEOUT = 20.0
 READ_TIMEOUT    = 5.0
 SERVICE_DISCOVERY_TIMEOUT = 10.0 
+DISCOVER_TIMEOUT = SCAN_TIMEOUT + 5.0  # Timeout for discovering device
 
 # --------------------------------------------------------------------------- #
 # Logging
@@ -138,10 +139,23 @@ def scan_macs():
 # Core async read functions (unchanged from the refactored version)
 # --------------------------------------------------------------------------- #
 async def read_data(mac: str) -> Optional[SensorReading]:
-    address = await _discover_device(mac)
+    
+    try:
+        address = await asyncio.wait_for(
+            _discover_device(mac),
+            timeout=DISCOVER_TIMEOUT,
+        )
+    except asyncio.TimeoutError:
+        log.warning("Device discovery timed out for %s after %.1fs", mac, DISCOVER_TIMEOUT)
+        return None
+
     if not address:
         return None
 
+    #address = await _discover_device(mac)
+    #if not address:
+    #    return None
+
     try:
         async with BleakClient(address, timeout=CONNECT_TIMEOUT) as client:
             # <---  NEW BLOCK  ----------------------------------------------