update

main.py

@@ -31,7 +31,7 @@ SUPPORTED_MESSAGES = [
  'TEXT_MESSAGE_APP'
 ]
 
-SUPPORTED_BRIDGE_DISTANCE_KM = 5
+SUPPORTED_BRIDGE_DISTANCE_KM = int(os.environ['BRIDGE_DISTANCE_KM']) if 'BRIDGE_DISTANCE_KM' in os.environ else 0
 CHANNEL_INDEX = 0
 NODE_PROXY = {BROADCAST_ADDR: BROADCAST_ADDR}