Binding request failed in MPC - ios

Question

#import "Session.h"
#import <MultipeerConnectivity/MultipeerConnectivity.h>
#interface Session () <MCSessionDelegate,MCBrowserViewControllerDelegate>
#property (strong,nonatomic) MCSession *session;
#property (strong,nonatomic) MCAdvertiserAssistant *advertiser;
#property (strong,nonatomic) MCPeerID *peerId;
#end
#implementation Session
#pragma mark - Initialiser(s)
//Setting the name of the peer
-(id)initWithDisplayName:(NSString *)name{
self = [super init];
self.peerId = [[MCPeerID alloc]initWithDisplayName:name];
return self;
}
#pragma mark - Property accessor(s)
//Late initialisation
-(MCSession *)session{
if(!_session){
_session = [[MCSession alloc]initWithPeer:self.peerId securityIdentity:nil encryptionPreference:MCEncryptionNone];
_session.delegate = self;
}
return _session;
}
#pragma mark - MCSessionDelegate Methods
//Detecting the change in the connection state of the peer
-(void)session:(MCSession *)session peer:(MCPeerID *)peerID didChangeState:(MCSessionState)state{
if (state == MCSessionStateConnecting) {
NSLog(#"Connecting to %#", peerID.displayName);
} else if (state == MCSessionStateConnected) {
NSLog(#"Connected to %#", peerID.displayName);
} else if (state == MCSessionStateNotConnected) {
NSLog(#"Disconnected from %#", peerID.displayName);
}
}
//Handling the data recieved by the session
-(void)session:(MCSession *)session didReceiveData:(NSData *)data fromPeer:(MCPeerID *)peerID{
[self.delegate session:self didRecieveData:data];
}
//Handling the stream recieved by the session
-(void)session:(MCSession *)session didReceiveStream:(NSInputStream *)stream withName:(NSString *)streamName fromPeer:(MCPeerID *)peerID{
[self.delegate session:self didRecieveAudioStream:stream];
}
//Started recieving stream
-(void)session:(MCSession *)session didStartReceivingResourceWithName:(NSString *)resourceName fromPeer:(MCPeerID *)peerID withProgress:(NSProgress *)progress{
}
//Finished recieving stream
-(void)session:(MCSession *)session didFinishReceivingResourceWithName:(NSString *)resourceName fromPeer:(MCPeerID *)peerID atURL:(NSURL *)localURL withError:(NSError *)error{
}
-(void)session:(MCSession *)session didReceiveCertificate:(NSArray *)certificate fromPeer:(MCPeerID *)peerID certificateHandler:(void (^)(BOOL))certificateHandler{
certificateHandler(YES);
NSLog(#"Recieved a certificate");
}
#pragma mark - MCBrowserViewControllerDelegate methods
//Browser view controller has completd
-(void)browserViewControllerDidFinish:(MCBrowserViewController *)browserViewController{
[browserViewController dismissViewControllerAnimated:YES completion:nil];
}
//Browser view controller is cancelled
-(void)browserViewControllerWasCancelled:(MCBrowserViewController *)browserViewController{
[browserViewController dismissViewControllerAnimated:YES completion:nil];
}
#pragma mark - Advertising and Browsing
//Initialise the browser
-(MCBrowserViewController *)browserViewControllerForServiceType:(NSString *)type{
MCBrowserViewController *browser = [[MCBrowserViewController alloc]initWithServiceType:type session:self.session];
browser.delegate = self;
return browser;
}
//Starting the advertiser for the particular service type
-(void)startAdvertisingForServiceType:(NSString *)type discoveryInfo:(NSDictionary *)info{
if(!self.advertiser)
self.advertiser = [[MCAdvertiserAssistant alloc]initWithServiceType:type discoveryInfo:info session:self.session];
[self.advertiser start];
}
//Stoping the advertiser
-(void)stopAdvertising{
[self.advertiser stop];
}
#pragma mark - Misc methods
//Creating the output stream in the current session
-(NSOutputStream *)outputStreamForPeer:(MCPeerID *)peerId{
NSError *error;
NSOutputStream *stream = [self.session startStreamWithName:#"Music" toPeer:peerId error:&error];
if(error)
NSLog(#"%#",[error userInfo].description);
return stream;
}
//Sending the date to all the peers connected to the session
-(void)sendData:(NSData *)data{
NSError * error;
[self.session sendData:data toPeers:self.session.connectedPeers withMode:MCSessionSendDataUnreliable error:&error];
if(error)
NSLog(#"%#",[error userInfo].description);
}
-(NSArray *)connectedPeers{
return [self.session connectedPeers];
}
#end
This is my session file in mpc. The error that i am getting is
Project[7347:876615] [GCKSession] Not in connected state, so giving up for participant [12ECD777] on channel [0].
and
Project[7347:876615] [ViceroyTrace] [ICE][ERROR] ICEStopConnectivityCheck() found no ICE check with call id (317511543)
Project[7347:876751] [ViceroyTrace] [ICE][ERROR] Send BINDING_REQUEST failed(C01A0041).
Need help

Answer 1

I've faced these problems some time ago and it ended up that I had done 2 mistakes:
Never, ever, copy a MCPeerID object: Once I was storing MCPeerID objects that I received in MCNearbyServiceBrowserDelegate's foundPeer calls as the key of a Dictionary, which copied the object. Then when later I used that peer ID to invite a peer via MCNearbyServiceBrowser the connection would fail because the MCPeerID was a copy.
If one of your devices is a iOS Simulator, make sure your firewall is not blocking external connections at the OS level.
I feel your pain... MCFramework logs don't help.
I hope this can help. Good luck.