Add logging module and verbose command line option

Useful for debugging.

bluetooth_battery.py

@@ -10,8 +10,10 @@
 
 import argparse
 import bluetooth
+import logging
 from typing import Optional, Union, List, Dict
 
+logger = logging.getLogger(__name__)
 
 class BatteryQueryError(bluetooth.BluetoothError):
  pass
@@ -31,7 +33,9 @@ def __next__(self):
  """
  Receive chunks
  """
- return self._sock.recv(self._chunk_size)
+ data = self._sock.recv(self._chunk_size)
+ logger.debug("<<< " + str(data))
+ return data
 
 
 class RFCOMMSocket(bluetooth.BluetoothSocket):
@@ -63,6 +67,7 @@ def send(self, data):
  """
  This function sends a message through a bluetooth socket with added line separators
  """
+ logger.debug(">>> " + str(data))
  return super().send(b"\r\n" + data + b"\r\n")
 
 
@@ -98,7 +103,9 @@ def _perform_query(self) -> int:
  """
  result = None
  sock = RFCOMMSocket()
+ logger.debug("Connecting to {}.{}".format(self._bt_settings[0], self._bt_settings[1]))
  sock.connect(self._bt_settings)
+ logger.debug("Connected")
  # Iterate received packets until there is no more or a result was found
  for line in sock:
  if b"BRSF" in line:
@@ -162,7 +169,10 @@ def main():
  parser = argparse.ArgumentParser(description="Get battery level from Bluetooth headsets")
  parser.add_argument("devices", metavar="DEVICE_MAC[.PORT]", type=str, nargs="+",
  help="(MAC address of target)[.SPP Port]")
+ parser.add_argument("-v", "--verbose", action="store_true", help="Enable verbose logs")
  args = parser.parse_args()
+ if args.verbose:
+ logging.basicConfig(level=logging.DEBUG)
  for device in args.devices:
  query = BatteryStateQuerier(*device.split("."))
  print("Battery level for {} is {}".format(device, str(query)))