[PD] FUDI protocol and interfacing external programs with netreceive

Lucas Cordiviola lucarda27 at hotmail.com
Thu Dec 5 17:31:04 CET 2019


If in doubt on what a FUDI message is you can send the (working) Pd 
message via [netsend -u] to a program that exposes the sent message. For 
example https://packetsender.com/


Mensaje telepatico asistido por maquinas.

On 12/5/2019 11:20 AM, afleck at inventati.org wrote:
> Hello,
> I have been looking into writing some external programs to send 
> messages to pd via netreceive.
> With netreceive in udp mode (-u), sending bytes not terminated by a 
> newline does not generate anything at the outlet.
> By "sending bytes" I do not mean that I have netreceive in -b mode, 
> just that I am not automatically terminating the message with a newline,
> as would happen with "echo foo; | pdsend 9999 localhost udp." In -b 
> mode no newline is necessary.
> As soon as a newline is added, the message is at the outlet. 
> Furthermore, it's actually not even necessary to include a semicolon 
> in the datagram.
> If i send the bytes \102\111\111\10 ("foo\n") to a netreceive 
> connected to print, i see "print: foo" in the console.
> This is not at all clear from either the help patches on netsend and 
> netreceive or the little information available online about FUDI,
> all of which mention that a message is just atoms, numbers, and 
> whitespace terminated by a semicolon. The Wikipedia page on FUDI even 
> says
> "A newline is just treated as whitespace and not needed for message 
> termination." as far as I can tell this was sourced from a (now 
> offline but archived) pure data wiki page, the genesis of which can be 
> found at: 
> https://lists.puredata.info/pipermail/pd-list/2009-01/067238.html.
> There's a good lead at 
> https://lists.puredata.info/pipermail/pd-list/2013-01/100183.html, 
> mentioning the required newline, but it also says a semicolon is 
> required, which I have found to not be the case.
> Can anyone clear this up for me? Is there any official specification 
> of FUDI available? I think having this information easily available 
> would be nice, and after I get to the bottom of it I'll correct the 
> Wikipedia page!
> I would also like to know how to send multiple messages in one 
> datagram. Sending "foo;bar;\n" to a netreceive connected to print only 
> gives me "print: foo" at the console, and trying to [route foo bar] 
> doesn't work.
> Cheers
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