code: def send(self, line):
          '''send some bytes'''
          line = line.strip()
          if line == ".":
              self.stop()
              return
          mav = self.master.mav
          if line != '+++':
              line += "\r\n"
          buf = [ord(x) for x in line]
          buf.extend([0]*(70-len(buf)))
  
          flags = mavutil.mavlink.SERIAL_CONTROL_FLAG_RESPOND
          flags |= mavutil.mavlink.SERIAL_CONTROL_FLAG_MULTI
          flags |= mavutil.mavlink.SERIAL_CONTROL_FLAG_EXCLUSIVE
          mav.serial_control_send(self.serial_settings.port,
                                  flags,
                                  0, self.serial_settings.baudrate,
                                  len(line), buff send(self, line):
          '''send some bytes'''
          line = line.strip()
          if line == ".":
              self.stop()
              return
          mav = self.master.mav
          if line != '+++':
              line += "\r\n"
          buf = [ord(x) for x in line]
          buf.extend([0]*(70-len(buf)))
  
          flags = mavutil.mavlink.SERIAL_CONTROL_FLAG_RESPOND
          flags |= mavutil.mavlink.SERIAL_CONTROL_FLAG_MULTI
          flags |= mavutil.mavlink.SERIAL_CONTROL_FLAG_EXCLUSIVE
          mav.serial_control_send(self.serial_settings.port,
                                  flags,
                                  0, self.serial_settings.baudrate,
                                  len(line), buf)
docs: send some bytes