fixes for working on mac air

meshtastic/__init__.py

@@ -72,7 +72,6 @@ from typing import *
 import serial
 import timeago
 import google.protobuf.json_format
-import pygatt
 from pubsub import pub
 from dotmap import DotMap
 from tabulate import tabulate
@@ -83,6 +82,10 @@ from meshtastic import (mesh_pb2, portnums_pb2, apponly_pb2, admin_pb2,
                         environmental_measurement_pb2, remote_hardware_pb2,
                         channel_pb2, radioconfig_pb2, util)
 
+if platform.system() == 'Linux':
+    # pylint: disable=E0401
+    import pygatt
+
 # Note: To follow PEP224, comments should be after the module variable.
 
 LOCAL_ADDR = "^local"