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    <p>I was having the same problem, and it seems to have been related to my app browsing and advertising at the same time, and two invitations being sent/accepted. When I stopped doing this and let one peer defer to the other for invitations the devices stayed connected.</p> <p>In my browser delegate I'm checking the hash value of the discovered peer's <code>displayName</code> and only sending an invitation if my peer has a higher hash value:</p> <p><strong>Edit</strong></p> <p>As pointed out by @Masa the <code>hash</code> value of an <code>NSString</code> will be different on 32 and 64 bit devices, so it's safer to use the <code>compare:</code> method on <code>displayName</code>. </p> <pre><code>- (void)browser:(MCNearbyServiceBrowser *)browser foundPeer:(MCPeerID *)peerID withDiscoveryInfo:(NSDictionary *)info { NSLog(@"Browser found peer ID %@",peerID.displayName); //displayName is created with [[NSUUID UUID] UUIDString] BOOL shouldInvite = ([_myPeerID.displayName compare:peerID.displayName]==NSOrderedDescending); if (shouldInvite){ [browser invitePeer:peerID toSession:_session withContext:nil timeout:1.0]; } else { NSLog(@"Not inviting"); } } </code></pre> <p>As you say, the documentation is sparse so who knows what Apple really wants us to do, but I've experimented with both sending and accepting invitations using a single session, and also creating a new session for each invitation accepted/sent, but this particular way of doing things has given me the most success. </p>
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    1. COVery helpful, thanks. Note that hash on NSString returns an NSUInteger. The results are therefore different on 32 and 64 bit systems. So I just had the case that no one was sending invites. I solved it by simply doing a string compare on the displayNames instead of using hash. (Apart from that, note also that hash on NSString should be used with care: http://www.abakia.de/blog/2012/12/05/nsstring-hash-is-bad/)
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    2. CO@Masa that's interesting, thanks. I'll definitely switch to using a string compare instead.
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