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FUDI (Fast Universal Digital Interface[1]) 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.


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.


pdsend / pdreceive[edit]

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][edit]

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

[netserver] / [netclient][edit]

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

Example messages[edit]

test/blah 123.45314;
my-slider 12;
hello this is a message;
this message continues
in the following
you; can; send; multiple messages; in a line;
this\ is\ one\ whole\ atom;


  1. ^ Puckette, Miller. "FUDI protocol specifications (acronym)". Pure Data Mailinglist. Retrieved 24 January 2019.

External links[edit]