# Method Stdio.UDP()->set_read_callback()

Method set_read_callback

  `UDP set_read_callback(function(mapping(string:int|string), mixed ... :void) read_cb, mixed ... extra_args)`

Description

  The read_cb function will receive a mapping similar to the mapping returned by read():

  `"data" : string` | Received data.
  `"ip" : string` | Data was sent from this IP.
  `"port" : int` | Data was sent from this port.

Returns

  The called object.

See also

  read()