Multipeer Connectivity Doesn't Connect Second Time

Question

I'm using the Multipeer Connectivity Framework to transfer files between devices. I'm using the standard MCAdvertiserAssistant and MCBrowserViewController to connect the devices. On the first try from device A to device B things work fine. Same things on the first transfer from device B to device A.

If you try either direction again, after MCBrowserViewController presents its dialog to choose a peer and you select one, the popup to accept the request on the other device never appears. No error messages, no calls to delegate methods - just nothing. Has anyone come across this and any ideas?

Answer 1

I had the same problem and solved it with initiating all the necessary components every time I start advertising or browsing for peers. It isn't the cleanest solution but in my case it works 100%.

The code below is how I implemented it, so this is without the build-in ViewController provided by Apple.

Please be aware that [session disconnect] is an async method which sometimes take a few seconds to complete.

- (void)startBrowsing
{
    // Initiate new advertiser
    isAdvertising = YES;

    _peerID = [[MCPeerID alloc] initWithDisplayName:@"Wallet"];
    _session = [[MCSession alloc] initWithPeer:_peerID];
    _session.delegate = self;

    _advertiser = [[MCNearbyServiceAdvertiser alloc] initWithPeer:_peerID discoveryInfo:nil serviceType:@"made2pay"];
    _advertiser.delegate = self;

    // Start advertiser
    [_advertiser startAdvertisingPeer];
}

- (void)stopBrowsing
{
    [_advertiser stopAdvertisingPeer];
    [_session disconnect];
    _session    = nil;
    _peerID     = nil;
    _advertiser = nil;

    isAdvertising = NO;
}