What’s your experience in real-time communication technologies and frameworks?
Back in 2014 we made our first production real-time chat using WebSockets.
Since then, we have moved on to ejabberd XMPP which has excellent support, both on the server and client side, making development and creating features like ‘seen’, ‘delivered’ and similar functionalities quicker and simpler.
But we don’t just use that. When working on the Fling app we actually worked directly with ProcessOne, the awesome guys who created ejabberd. They took care of the server side, while we in DECODE handled the client side. Later we also worked with Erlang Solutions XMPP platform MongooseIM and some other proprietary technologies.
As far as third-party services are concerned (where there isn’t so much room for hard-core modification) we have tried out TokBox, Twilio and Bandwidth, and used Sinch (a tool from the same category which also offers audio and video communication).