Message Send Protocol

The Message Send Protocol (MSP) is an application layer protocol used to send a short message between nodes on a network. The original version of the protocol was published in 1990.[1] It was updated as Message Send Protocol 2 in 1992.[2]

TCP-based service

One message send service is defined as a connection-based application on TCP. A service listens for TCP connections on port 18. Once a connection is established, a short message is transmitted from the sender to the receiver over the connection. The sender closes the connection after sending the message.

UDP-based service

Another message send service is defined as a datagram-based application on UDP. A service listens for UDP datagrams on port 18. When a datagram is received by the receiver, an answering datagram is sent back to the sender containing exactly the same data.

gollark: It's a 366ADU2M53240A X1.
gollark: Your chips are *visible* and *physically exist*?
gollark: Apioform #26 is free.
gollark: It's already too late.
gollark: Oh, but you're fine, of course.

See also

References
  1. RFC 1159 Message Send Protocol
  2. RFC 1312 Message Send Protocol 2
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