2.10.3 UDP Stream Objects

Note that, unlike the name suggests, there is nothing stream-like about UDP.

 The asynchronous service routine to be called on events such as datagram arrival without outstanding Read call. The asr has a single argument, the event code.

A read-only member giving the port number of this UDP Stream.

Read a datagram, waiting at most timeout seconds (-1 is infinite). Return the data.

Write(host, port, buf)
Send buf as a datagram to IP-address host, port port.
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