code: def send_sysex(self, sysex_command, sysex_data=None):
          
          if not sysex_data:
              sysex_data = []
  
          # convert the message command and data to characters
          sysex_message = chr(self.START_SYSEX)
          sysex_message += chr(sysex_command)
          if len(sysex_data):
              for d in sysex_data:
                  sysex_message += chr(d)
          sysex_message += chr(self.END_SYSEX)
  
          for data in sysex_message:
              self.pymata.transport.write(data)
docs: This method will send a Sysex command to Firmata with any accompanying data
  
          :param sysex_command: sysex command
  
          :param sysex_data: data for command
  
          :return : No return value.