Fixed import

setup.py

@@ -67,7 +67,6 @@ setup(
         'grpcio<=1.43.0',
         'protobuf',
         'cachetools',
-        'tb-mqtt-client'
     ],
     download_url='https://github.com/thingsboard/thingsboard-gateway/archive/%s.tar.gz' % VERSION,
     entry_points={

thingsboard_gateway/gateway/tb_client.py

@@ -16,9 +16,15 @@ import logging
 import threading
 from time import sleep, time
 from ssl import CERT_REQUIRED, PROTOCOL_TLSv1_2
-from tb_mqtt_client.tb_gateway_mqtt import TBGatewayMqttClient
 from thingsboard_gateway.tb_utility.tb_utility import TBUtility
 
+try:
+    from tb_gateway_mqtt import TBGatewayMqttClient
+except ImportError:
+    print("tb-mqtt-client library not found - installing...")
+    TBUtility.install_package('tb-mqtt-client')
+    from tb_gateway_mqtt import TBGatewayMqttClient
+
 log = logging.getLogger("tb_connection")
 
 CHECK_CERT_PERIOD = 86400