Is Websocket API available for custom browser clients?

[Prashant Goswami]

Hello,

 I have written a custom html client using openHAB rest API. But for receiving events is websocket API available?

Thanks in advance.

[Kai Kreuzer]

Hi Prashant,

What we have available as websocket/streaming is documented here: https://github.com/openhab/openhab/wiki/REST-API#streaming-connections

Note that you can not arbitrarily receive any events there, but only the ones that are together on a page of a sitemap.

Best regards,

Kai

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[ver...@gmail.com]

Hi Kai,

   Just to clarify, it's not possible to subscribe to the main REST items list (global), or to subscribe to a single REST item state? I'm trying to modify the GreenT app to at least test binding to something but my Js is terrible.

  I snagged what I think are the first steps with GreenT from the forum and while it says the websocket connection was successful to a single item, I can't get the response body to show up. :(

  I'm using the subscribe function from GreenT and trying to display the response in the console (to start) but all I get is [object Object]. Given your earlier response I can put al objects one one sitemap (if that was what you meant) or change the server as needed, but I would really like to query the server via websockets (long-polling etc) and as the item updates, change the HTML display.

  My changes to the GreenT snippet,

function Request(item) {

    this.socket = $.atmosphere;
    this.subSocket;
    this.transport = 'websocket';
    this.request = { url: 'ws://192.168.1.13:8080/rest/items/' + item,
                    maxRequest : 256,
                    timeout: 59000,
                    attachHeadersAsQueryString : true,
                    executeCallbackBeforeReconnect : false,
                    contentType : "text/plain",
                    logLevel : 'debug',
                    transport : 'websocket' ,
                    fallbackTransport: 'long-polling',
                    headers: {'Accept': 'application/json',
                            'X-Atmosphere-tracking-id': '1234'}};

    this.request.onOpen = function(response) {
        $('body').append('<p>Atmosphere connected using ' + response.transport + '</p>');
        console.log('Server: ' + response);
       
    };


 Any tips would be greatly appreciated.

-J

[Kai Kreuzer]

Hi,

   Just to clarify, it's not possible to subscribe to the main REST items list (global), or to subscribe to a single REST item state?

You are right. This is actually something I want to provide with openHAB 2.0 (based on Eclipse SmartHome) - an according issue can be found right here: https://bugs.eclipse.org/bugs/show_bug.cgi?id=423552

Regarding the GreenT code, I cannot really help you much - this was fully done by Mihail.

Best regards,

Kai