Why does my MCSession peer disconnect randomly?

objective-c ios7 multipeer-connectivity
tillerstarr picture tillerstarr · Sep 21, 2013 · Viewed 11k times · Source

Im using MCNearbyServiceBrowser and MCNearbyServiceAdvertiser to join two peers to a MCSession. I am able to send data between them using MCSession's sendData method. All seems to be working as expected until I randomly (and not due to any event I control) receive a MCSessionStateNotConnected via the session's MCSessionDelegate didChangeState handler. Additionally, the MCSession's connectedPeers array no longer has my peers.

Two questions: Why? and How do i keep the MCSession from disconnecting?

Answer

Andrew Cone picture Andrew Cone · Oct 31, 2013

This is a bug, which I just reported to Apple. The docs claim the didReceiveCertificate callback is optional, but it's not. Add this method to your MCSessionDelegate:

- (void) session:(MCSession *)session didReceiveCertificate:(NSArray *)certificate fromPeer:(MCPeerID *)peerID certificateHandler:(void (^)(BOOL accept))certificateHandler
 {
     certificateHandler(YES);
 }

The random disconnects should cease.

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