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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