code: def init(self):
          
          if not self.export_enable:
              return None
          try:
              client = paho.Client(client_id='glances_' + self.hostname,
                                   clean_session=False)
              client.username_pw_set(username=self.user,
                                     password=self.password)
              if self.tls:
                  client.tls_set(certs.where())
              client.connect(host=self.host,
                             port=self.port)
              client.loop_start()
              return client
          except Exception as e:
              logger.critical("Connection to MQTT server failed : %s " % e)
              return None
docs: Init the connection to the MQTT server.