allow logging serial debug to different files

*.pyc

@@ -1 +0,0 @@
-*.pyc

bin/run.sh

@@ -1 +1 @@
-python3 -m meshtastic --debug
+python3 -m meshtastic --debug "$@"

meshtastic/__main__.py

@@ -3,7 +3,7 @@
 import argparse
 from .interface import StreamInterface
 import logging
-from time import sleep
+import sys
 
 
 def main():
@@ -15,13 +15,27 @@ def main():
         help="The port the Meshtastic device is connected to, i.e. /dev/ttyUSB0. If unspecified, we'll try to find it.",
         default=None)
 
-    parser.add_argument("--debug", help="Show debug log message",
+    parser.add_argument(
+        "--seriallog",
+        help="Log device serial output to either 'stdout', 'none' or a filename to append to.  Defaults to stdout.",
+        default="stdout")
+
+    parser.add_argument("--debug", help="Show API library debug log messages",
                         action="store_true")
 
     args = parser.parse_args()
-
     logging.basicConfig(level=logging.DEBUG if args.debug else logging.INFO)
-    client = StreamInterface(args.device)
+
+    if args.seriallog == "stdout":
+        logfile = sys.stdout
+    elif args.seriallog == "none":
+        logging.debug("Not logging serial output")
+        logfile = None
+    else:
+        logging.info(f"Logging serial output to {args.seriallog}")
+        logfile = open(args.seriallog, 'w+', buffering=1)  # line buffering
+
+    client = StreamInterface(args.device, debugOut=logfile)
 
 
 if __name__ == "__main__":

meshtastic/interface.py

@@ -137,7 +137,7 @@ class StreamInterface(MeshInterface):
             devPath, 921600, exclusive=True, timeout=0.5)
         self._rxThread = threading.Thread(target=self.__reader, args=())
         self._rxThread.start()
-        MeshInterface.__init__(self)
+        MeshInterface.__init__(self, debugOut=debugOut)
 
     def _sendToRadio(self, toRadio):
         """Send a ToRadio protobuf to the device"""
@@ -172,10 +172,11 @@ class StreamInterface(MeshInterface):
                 if ptr == 0:  # looking for START1
                     if c != START1:
                         self._rxBuf = empty  # failed to find start
-                        try:
-                            self.debugOut.write(b.decode("utf-8"))
-                        except:
-                            self.debugOut.write('?')
+                        if self.debugOut != None:
+                            try:
+                                self.debugOut.write(b.decode("utf-8"))
+                            except:
+                                self.debugOut.write('?')
 
                 elif ptr == 1:  # looking for START2
                     if c != START2: