def setup_client(device):
'''
Sets up IoT client object configuration
<type device> dict
<desc device> valid device configuration
<<type client>> Client object (from AWSIoTPythonSDK MQTT PAHO library)
<<desc client>> with set flags, callbacks, and TLS credentials
'''
try:
client = mqtt.Client(device['client_id'])
print('MQTT Client initialized; setting flags...')
except Exception as err:
print(f"Exception Error: Unable to initialize client object\n{err}")
# set flags
client.bad_connection_flag = False
client.bad_auth_flag = False
client.connected_flag = False
client.disconnected_flag = False
print('binding callbacks...')
try:
client.on_connect = onConnect
client.on_disconnect = onDisconnect
'''
client.on_message = onMessage
client.on_publish = onPublish
client.on_subscribe = onSubscribe
client.on_unsubscribe = onUnsubscribe
client.on_log = onLog
'''
print('callbacks bound.')
except Exception as err:
print(f"Exception Error: error binding callbacks to client\n{err}")
print('setting TLS credentials...')
try:
client.tls_set(ca_certs=device['ca_file'],
certfile=device['cert_file'],
keyfile=device['key_file'],
cert_reqs=ssl.CERT_REQUIRED,
tls_version=ssl.PROTOCOL_SSLv23,
ciphers=None)
print('TLS credentials set successfully')
except Exception as err:
print(f"Exception Error: error setting tls credentials\n{err}")
return client
def get_iot_client(device):
'''
Setup and config AWS IoT client
<type device> dict
<desc device> device configuration values
<<type client>> AWS IoT Client Object
<<desc client>> none
'''
try:
client = mqtt.Client(device['clientId'])
client.bad_connection_flag = False
client.bad_auth_flag = False
client.connected_flag = False
client.disconnected_flag = False
client.on_connect = onConnect
client.on_disconnect = onDisconnect
client.on_message = onMessage
'''
client.on_publish = onPublish
client.on_subscribe = onSubscribe
client.on_unsubscribe = onUnsubscribe
client.on_log = onLog
'''
except TypeError as typ_err:
print(f"Type Error: {typ_err}")
except Exception as exc_err:
print(f"Error: binding callbacks failure\n{exc_err}")
else:
try:
client.tls_set(ca_certs=device['caFile'],
certfile=device['certFile'],
keyfile=device['keyFile'],
cert_reqs=ssl.CERT_REQUIRED,
tls_version=ssl.PROTOCOL_SSLv23,
ciphers=None)
except Exception as exc_err:
print(f"Error: setting TLS credentials failure\n{exc_err}")
sys.exit()
else:
return client
def _create_paho_client(self, client_id, clean_session, user_data, protocol, use_wss):
self._logger.debug("Initializing MQTT layer...")
return mqtt.Client(client_id, clean_session, user_data, protocol, use_wss)
def createPahoClient(self, clientID, cleanSession, userdata, protocol,
useWebsocket):
return mqtt.Client(clientID, cleanSession, userdata, protocol,
useWebsocket) # Throw exception when error happens