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== SSI message structure ==
An SSI message consists of a 2-byte header and an ''n''-byte payload. The header consists of a one byte address (wildcard is '?', 0x3F in [[ASCII]]) and a one byte message/command type. The different possible values for the message/command type are presented in SSI v1.2 command base.
=== SSI v1.2 command base ===
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SSI networking in a variable environment is done using nanoIP. In a typical case using SSI, an individual message is not important, and so nanoUDP (simplified [[User Datagram Protocol|UDP]] defined by nanoIP) is used as the message format. If individual messages are important, nanoTCP can be used, as it provides flow control and retransmission at a cost of message size and increase in network traffic.
A nanoUDP message consists of a 5-byte nanoUDP header, an ''n''-byte message payload and an optional 2-byte CRC checksum. The header consists of one protocol byte, a 2-byte message length (total length, including header and CRC), a 1-byte source port and a 1-byte destination port number. The destination port number should be 0x28 for SSI messages.
== Version history ==
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