FUDI**** (Fast Universal Digital Interface ) is a networking protocol used by the Pure Data patching language invented by Miller Puckette. It is a string-based protocol in which messages are separated by semicolons. Messages are made up of tokens separated by whitespaces, and numerical tokens are represented as strings.

Format

FUDI is a packet-oriented protocol. Each message consists of one or more atoms, separated by one or more whitespace characters, and it's terminated by a semicolon character. An atom is a sequence of one or more characters; whitespaces inside atoms can be escaped by the backslash (ascii 92) character (see Examples below). A whitespace is either a space (ascii 32), a tab (ascii 9) or a newline (ascii 10). A semicolon (ascii 59) is mandatory to terminate (and send) a message. A newline is just treated as whitespace and not needed for message termination.

Implementations

pdsend / pdreceive

Those command-line tools are distributed with the software Pure Data. They are meant to be used with their counterparts, the classes [netsend] / [netreceive] of Pd.

[netsend] / [netreceive]

Those classes can be used to transport Pd-messages over a TCP or UDP socket. Both are part of Pd-vanilla.

[netserver] / [netclient]

Those are part of maxlib and allow bidirectional connections of multiple clients with one server.

Example messages

test/blah 123.453 my-slider 12; hello this is a message; this message continues in the following line; you; can; send; multiple messages; in a line; this\ is\ one\ whole\ atom; this_atom_contains_a
newline_character_in_it;