refactor of Tunnel() for unit testing; create unit tests for Tunnel()

meshtastic/stream_interface.py

@@ -39,7 +39,10 @@ class StreamInterface(MeshInterface):
         self._wantExit = False
 
         # FIXME, figure out why daemon=True causes reader thread to exit too early
-        self._rxThread = threading.Thread(target=self.__reader, args=(), daemon=True)
+        if noProto:
+            self._rxThread = None
+        else:
+            self._rxThread = threading.Thread(target=self.__reader, args=(), daemon=True)
 
         MeshInterface.__init__(self, debugOut=debugOut, noProto=noProto)
 
@@ -65,7 +68,8 @@ class StreamInterface(MeshInterface):
         if not self.noProto:
             time.sleep(0.1)  # wait 100ms to give device time to start running
 
-        self._rxThread.start()
+        if not self.noProto:
+            self._rxThread.start()
 
         self._startConfig()
 
@@ -117,8 +121,9 @@ class StreamInterface(MeshInterface):
         # pyserial cancel_read doesn't seem to work, therefore we ask the
         # reader thread to close things for us
         self._wantExit = True
-        if self._rxThread != threading.current_thread():
-            self._rxThread.join()  # wait for it to exit
+        if not self.noProto:
+            if self._rxThread != threading.current_thread():
+                self._rxThread.join()  # wait for it to exit
 
     def __reader(self):
         """The reader thread that reads bytes from our stream"""