[PD] tcpclient sending more than 1 send at once

Roman Haefeli reduzierer at yahoo.de
Tue Sep 9 00:19:23 CEST 2008

On Tue, 2008-09-09 at 00:03 +0200, Roman Haefeli wrote:
> On Mon, 2008-09-08 at 21:26 +0000, Martin Peach wrote:
> > Roman Haefeli wrote:
> > >all i need is a _robust_ OSC over TCP implementation. the bandwidth used
> > >is not high in average, but i cannot make any assumptions about peaks,
> > >it could well be that 2000 packets are sent at the same time.
> > 
> > If you send 2000 packets from one machine to another wouldn't that be 
> > construed as a denial of service attack?
> no. would it, if you upload a 1 gig file to a file server? (which is
> basically the same from tcp's perspective)
> > Surely you can compress the information into fewer packets, say by using a 
> > single OSC message to send an array of values.
> in some cases yes, but in this particular case it is not possible. if a
> new client connects netpd, it request a state dump from another client,
> this other client sends the dump immediately. i don't know how to
> compress state dumps from a an arbitrary number of instruments with an
> arbitrary number of parameters with arbitrary message format and
> arbitrary number of elements. but this is just some arbitrary example. i
> generally don't think, that i am trying to use OSC in a wierd manner. 
> > Unless you mean 2000 machines are sending single packets to one machine, in 
> > which case the packets will all be separate, there's no problem apart from 
> > overloading the cpu for a few seconds.
> in netpd everything is possible. there is an arbitrary number of
> [tcpclient]s connected to one [tcpserver], while the patch with
> [tcpserver] is acting as an OSC proxy, that forwards incoming OSC
> packets to one or more clients. see more details on
> http://www.netpd.org/server 
> it used to work well with FUDI (besides the monthly netpd-server
> crashes), since [netserver] and co don't seem to rely on tcp packeting,
> but use a delimiter ';\n' to separate packets. however, the same thing
> doesn't work, when i switch to OSC. i can just repeat myself: all
> trouble comes from [unpackOSC]'s unability to create packets on its own.
> any pd project based on OSC/TCP will potentially suffer from this
> problem, it is not only because of some (assumed) strange way of using
> OSC. if [unpackOSC] is meant to be used only under _certain_
> circumstances, i think, it should be documented accordingly. 

sorry, i guess i was sounding harsh. 

i understand, that you don't want to change [unpackOSC], if it means
completely rewriting it. it's just sad, that netpd cannot make use of it
as it is now. it would have been a big step forward.


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