code: def register_master():
      
      tango_db = Database()
      device = "sip_sdp/elt/master"
      device_info = DbDevInfo()
      device_info._class = "SDPMasterDevice"
      device_info.server = "sdp_master_ds/1"
      device_info.name = device
      devices = tango_db.get_device_name(device_info.server, device_info._class)
      if device not in devices:
          LOG.info('Registering device "%s" with device server "%s"',
                   device_info.name, device_info.server)
          tango_db.add_device(device_info)
docs: Register the SDP Master device.