support new --set factory_reset true preferences option

meshtastic/__init__.py

@@ -278,7 +278,7 @@ class MeshInterface:
             self._disconnected()
             self._startConfig()  # redownload the node db etc...
         else:
-            logging.warn("Unexpected FromRadio payload")
+            logging.debug("Unexpected FromRadio payload")
 
     def _fixupPosition(self, position):
         """Convert integer lat/lon into floats

meshtastic/__main__.py

@@ -139,7 +139,8 @@ def onConnected(interface):
     except Exception as ex:
         print(ex)
 
-    if closeNow:
+    # if the user didn't ask for serial debugging output, we might want to exit after we've done our operation
+    if (not args.seriallog) and closeNow:
         interface.close()  # after running command then exit