Keeping RTCDataChannel open in background mode iOS

[Xavi R. Pinteño]

Hi,

   I'm building a chat/video app.

For signaling with the server I use websockets and there's a heartbeat implemented. But at some point when app goes to the

background datachannel dies.

Since it's a p2p chat, server doesn't know when the user is receiving a message, so I cannot rely in remote push notifications.

Is there any way, or does actually make sense to have a datachannel open all the time?

[Kaiduan Xie]

Lets assume Alice is chatting with Bob, the application on Bob side
goes to background,

In this case PeerConnection on Alice side will know that the ICE
connection is terminated, then application on Alice side can send a
push notification to application on Bob side. Upon receiving the push
notification from Alice, application on Bob side re-establishes the
PeerConnection/Data Channel including the ICE connectivity check with
Alice and continues the chat.

/Kaiduan

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