[PD] listing to json port?

[ub@xdv]

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.

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