UDPDatagramConnection (Java Card API, Connected Edition)
Date: 2009-12-11

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## javax.microedition.io
Interface UDPDatagramConnection

All Superinterfaces:
  Connection, DatagramConnection

    @TransactionType(value=NOT_SUPPORTED)
    public interface UDPDatagramConnection

extends DatagramConnection

This interface defines a datagram connection which knows it's local end point address. The protocol is transaction oriented, and delivery and duplicate protection are not guaranteed. Applications requiring ordered reliable delivery of streams of data should use the `SocketConnection`.

A `UDPDatagramConnection` is returned from `Connector.open()` in response to a request to open a `datagram://` URL connection string. If the connection string omits both the `host` and `port` fields in the URL string, then the system will allocate an available port. The local address and the local port can be discovered using the accessor methods within this interface.

The syntax described here for the datagram URL connection string is also valid for the `Datagram.setAddress()` method used to assign a destination address to a `Datagram` to be sent. e.g., `datagram://`host:port

## BNF Format for Connector.open() string

The URI must conform to the BNF syntax specified below. If the URI does not conform to this syntax, an `IllegalArgumentException` is thrown.

<datagram_connection_string> | ::= "datagram://" | "datagram://"<hostport>
<hostport> | ::= host ":" port
<host> | ::= host name or IP address (omitted for inbound connections)
<port> | ::= numeric port number (omitted for system assigned port)

Since:
  MIDP 2.0, Foundation Profile 1.1, Java Card 3.0

Method Summary
`String` | `getLocalAddress()` Gets the local address to which the datagram connection is bound.
`int` | `getLocalPort()` Returns the local port to which this datagram connection is bound.

Methods inherited from interface javax.microedition.io.DatagramConnection
`getMaximumLength, getNominalLength, newDatagram, newDatagram, newDatagram, newDatagram, receive, send`

Methods inherited from interface javax.microedition.io.Connection
`close`

Method Detail

### getLocalAddress

    String getLocalAddress()
                           throws IOException

  Gets the local address to which the datagram connection is bound.

  The host address(IP number) that can be used to connect to this end of the datagram connection from an external system. Since IP addresses may be dynamically assigned, a remote application will need to be robust in the face of IP number reassignment.

  The local hostname (if available) can be accessed from `System.getProperty("microedition.hostname")`

  Returns:
    the local address to which the datagram connection is bound.
  Throws:
    `IOException` - if the connection was closed.
  See Also:
    `ServerSocketConnection`

### getLocalPort

    int getLocalPort()
                     throws IOException

  Returns the local port to which this datagram connection is bound.

  Returns:
    the local port number to which this datagram connection is connected.
  Throws:
    `IOException` - if the connection was closed.
  See Also:
    `ServerSocketConnection`

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Copyright (c) 2009 Sun Microsystems, Inc. All rights reserved.