[PD] listing to json port?

ub@xdv ub at xdv.org
Tue Sep 5 20:34:50 CEST 2017

On 05.09.2017 20:09, ub at xdv wrote:
> On 05.09.2017 11:17, IOhannes m zmoelnig wrote:
>> On 09/05/17 02:31, João Pais wrote:
>>>>> Hello list,
>>>>> I wanted to know if it's possible to listen to a port 6437, where some
>>>>> json messages are coming in. I've seen in my webbrowser that the port is
>>>>> indeed active, but when I try udpreceive nothing comes out - which
>>>>> probably means that I'm not getting the process.
>>>> tcpreceive?
>>> that would probably work, but I guess the javascript code is necessary
>>> to open the port in the first place. Is there a way of Pd opening a html
>>> file with that?
>> i'm not sure i understand the problem.
>> you write:
>>> if it's possible to listen to a port 6437
>> the answer is: yes of course.
>> there are two things to keep in mind though:
>> - you must know whether the protocol is TCP/IP or UDP. without that
>> information, the port is pretty useless.
>> since this is about JSON and web-technology, chances are high that the
>> protocol is indeed TCP/IP, that's why is suggested to use [tcpreceive]
>> instead of [udpreceive].
>> - on a given machine, you can only have a single listener listening on a
>> given port. so if you have a webbrowser already monitoring the data, you
>> can *not* also have Pd doing the same (on the same machine).
>> in any case, there also might be some confusion about "listening". it
>> could well be, that you are trying to talk to a webserver that speaks
>> JSON via a REST API. in which case, your Pd patch wouldn't *listen* but
>> instead connect to the webserver ([tcpclient]).
> there is an external called purest-json (on deken) to deal with
> json-REST-APIs, but i have never tried it.
oops, i missed, that you mentioned that alread. suppose one should
really read before posting. sorry.

> also it could be json over websockets, which makes a lot of sense for
> realtime applications.
> there is a very interesting 100%-vanilla-websocket-server patch here:
> https://sourceforge.net/projects/websocketserverinapatch/files/
> no json in this one though.
> cheers,
> ub
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