code: async def del_alternative(self, alt, timeout=OTGW_DEFAULT_TIMEOUT):
          
          cmd = OTGW_CMD_DEL_ALT
          alt = int(alt)
          if alt < 1 or alt > 255:
              return None
          ret = await self._wait_for_cmd(cmd, alt, timeout)
          if ret is not None:
              return int(ret)
docs: Remove the specified Data-ID from the list of alternative
          commands. Only one occurrence is deleted. If the Data-ID
          appears multiple times in the list of alternative commands,
          this command must be repeated to delete all occurrences. The
          table of alternative Data-IDs is stored in non-volatile memory
          so it will persist even if the gateway has been powered off.
          Data-ID values from 1 to 255 are allowed.
          Return the ID that was removed from the list, or None on
          failure.
  
          This method is a coroutine