WebSocket support, live data subscriptions

[j-forster]

For now, subscriptions to the fiware-orion broker will trigger an http request to a given endpoint.
This method is not usable for wep app clients, that can not function as an http server.

See telefonicaid/fiware-orion#1181
It seems like WebSocket has not been implemented yet.
As a solution to this, a WebSocket gateway can functions as a bridge between the clients and the broker.

WebSocket gateway

The gateway should connect

• the broker, that can handle subscriptions with http requests only
• the web client

In order to listen for data changes, the client can open a websocket connection to the ws-gateway.
The gateway makes a subscription to the broker, and will pass any data-changes to the client via ws.
Closing the websocket connection will make the broker unsubscribe the previously create subscriptions.
Web Client <===WebSocket===> WS-Gateway <---HTTP---> Broker

What is your opinion?
I think, a Waziup WS-Gateway can boost the WebApps enormously.

[cdupont]

Actually it seems that the bulk of the work is done in Orion: telefonicaid/fiware-orion#1669
Only documentation, tests, style and some configuration aspects are pending.
Probably we can get the feature in HEAD, perhaps compiling with some flags.
Tell me what you think.

[j-forster]

Your right @cdupont, I didn't see the progress that they made.
I would really appreciate this feature, because it will be really useful and it's the only way to monitor live data within WebApps.

Is there any chance of enabling this feature with the Waziup broker?

[cdupont]

There is already the HEAD of Orion in Waziup... Maybe the feature is already present? Could you check?

[j-forster]

It is in a different branch: https://github.com/telefonicaid/fiware-orion/tree/feature/1181_websockets
But this branch is far behind master..
However, I tested ws://broker.waziup.io and ws://broker.waziup.io:9010 - both don't connect.

[j-forster]

So we're back where the question began: Interested in a WebSocket gateway?

[ARBISWAS]

It is a good idea to integrate the WebScoket in WAZIUP platform

[cdupont]

Orion dev replied: telefonicaid/fiware-orion#1181 (comment)
They will not integrate websockets in the foreseeable future.
So let's go with a web socket gateway!

[cdupont]

closing as too old. Let's reopen another issue if still needed.