Add verbose Output to logger

Signed-off-by: Chris Fiege <chris@tinyhost.de>

sa868/__init__.py

 import argparse
 import serial
+import logging
 
 class SA868(object):
 
@@ -11,6 +12,7 @@ class SA868(object):
 
     def __init__(self, port):
         self._serial = serial.Serial(port, 9200, timeout=1)
+        self._logger = logging.getLogger("SA868")
 
     def _check_freq_range(self, freq):
         if (freq >= 400 and freq <= 480) or (freq >= 134 and freq <=174):
@@ -34,11 +36,15 @@ class SA868(object):
             raise Exception("Volume out of range")
 
     def _command_return(self, command, expected_return):
+        self._logger.info("TRX <-- ")
         command = "{}\r\n".format(command)
+        self._logger.info(command)
         self._serial.write(command.encode())
         ret = self._serial.readline()
         ret = bytes([x for x in ret if x is not 0x00])
         ret = ret.decode().strip()
+        self._logger.info("TRX --> ")
+        self._logger.info(ret)
         if ret.startswith(expected_return):
             return ret.split(expected_return)[-1]
         else:
@@ -94,8 +100,14 @@ def main():
     parser.add_argument("--set-filter", help="Sets the pre-/de-emphasis, highpass- and lowpass-filter. Use {off, on}", nargs=3, metavar=("pre_de_emphasis", "lowpass", "highpass"))
     parser.add_argument("--get-rssi", help="Prints the current RSSI to STDOUT", action="store_true")
     parser.add_argument("--no-ping", help="Disables the initial ping of the device", action="store_true")
+    parser.add_argument("-v", help="Be more verbose", action="store_true")
     args = parser.parse_args()
 
+    if args.v:
+        logging.basicConfig(level= logging.INFO)
+    else:
+        logging.basicConfig(level= logging.WARN)
+
     s = SA868(args.tty)
     if not args.no_ping:
         s.ping()