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in Multipeer Connectivity Jay Thrash [360|iDev min] October 2014 Adventures Adventures

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Overview Lifecycle Implement Demo

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Multipeer Connectivity Overview

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Multipeer Connectivity Overview What does it do?

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“A framework for discovering services provided by, and communicating with, nearby iOS devices” Multipeer Connectivity Overview - WWDC, June 2013

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“A framework for discovering services provided by, and communicating with, nearby iOS and OS X devices” Multipeer Connectivity Overview - WWDC, June 2014

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Multipeer Connectivity Overview What does it do? No, really…

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“A framework for creating an ad-hoc network of nearby iOS & OS X devices” Multipeer Connectivity Overview - Me, just now

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Multipeer Connectivity Overview Wi-Fi Bluetooth Peer-to-Peer Wi-Fi R.Y.O.N.N.

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Multipeer Connectivity Overview Wi-Fi Bluetooth Peer-to-Peer Wi-Fi R.Y.O.N.N. It’s Magic!

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“A framework for creating an ad-hoc network of that allows nearby iOS & OS X devices to communicate” Multipeer Connectivity Overview - Me, (again), just now

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Multipeer Connectivity Overview Why does it matter?

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✉️ ✉️ ✉️ Multipeer Connectivity Overview ✉️

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✉️ ✉️ ✉️ Multipeer Connectivity Overview ✉️ ☁

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✉️ ✉️ ✉️ Multipeer Connectivity Overview ✉️

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✉️ ✉️ ✉️ Multipeer Connectivity Overview

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✉️ ✉️ ✉️ Multipeer Connectivity Overview

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Multipeer Connectivity Overview MOREEfficient Secure

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Multipeer Connectivity Overview

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Multipeer Connectivity Lifecycle

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Multipeer Connectivity Lifecycle Advertise Discover Invite Connect Communicate

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Multipeer Connectivity Lifecycle Advertise Discover Invite Connect Communicate

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Multipeer Connectivity Lifecycle Advertise Discover Invite Connect Communicate ? ?

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Multipeer Connectivity Lifecycle Advertise Discover Invite Connect Communicate ✅ ✅

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Multipeer Connectivity Lifecycle Advertise Discover Invite Connect Communicate

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Multipeer Connectivity Lifecycle Advertise Discover Invite Connect Communicate

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Multipeer Connectivity Implement

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Multipeer Connectivity Implement @import MultipeerConnectivity; Step 0: Import Framework

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Multipeer Connectivity Implement MCPeerID peerID = [[MCPeerID alloc] initWithDisplayName:peerName]; Step 1: Create Identity

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Multipeer Connectivity Implement MCSession session = [[MCSession alloc] initWithPeer:peerID]; Step 2: Create Session

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Multipeer Connectivity Implement MCAdvertiserAssistant advertiser = [[MCAdvertiserAssistant alloc] initWithServiceType:serviceType discoveryInfo:nil session:session]; advertiser.delegate = self; [advertiser start]; Step 3: Advertise

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Multipeer Connectivity Implement MCBrowserViewController browser = [[MCBrowserViewController alloc] initWithServiceType:serviceType session:session]; browser.minimumNumberOfPeers = min; browser.maximumNumberOfPeers = max; browser.delegate = self; [self presentViewController:browser ...]; Step 4: Discover

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Multipeer Connectivity Implement MCSession Step 5: Communicate Message Stream Resources

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Multipeer Connectivity Implement MCSession // Send Message [session sendData:messageData toPeers:@[peerID,peerID,peerID,…] withMode:MCSessionSendDataReliable error:&error]; // MCSessionSendDataReliable is faster, but… // delivery is not guaranteed // nor is order Step 5: Communicate

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Multipeer Connectivity Implement MCSessionDelegate // Receive Message -(void) session:(MCSession *)session didReceiveData:(NSData *)data fromPeer:(MCPeerID *)peerID { // Unarchive data to object } Step 5: Communicate

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Multipeer Connectivity Implement MCSession // Create Stream NSOutputStream *stream = [session startStreamWithName:streamName toPeer:peerID error:&error] // write to stream Step 5: Communicate

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Multipeer Connectivity Implement MCSessionDelegate // Receive on stream - (void)session:(MCSession *)session didReceiveStream:(NSInputStream *)stream withName:(NSString *)name fromPeer:(MCPeerID *)peerID Step 5: Communicate

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Multipeer Connectivity Implement MCSession // Send resource NSProgress *progress = [session sendResourceAtURL:url withName:name toPeer:peerID completionHandler:completionHandler]; // controlling transfer progress.fractionCompleted; [progress cancel]; Step 5: Communicate

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Multipeer Connectivity Implement MCSessionDelegate // Receiving Resource - (void)session:(MCSession *)session didStartReceivingResourceWithName:(NSString *) resourceName:(NSString *) fromPeer:(MCPeerID *)peerID withProgress:(NSProgress *) prg Step 5: Communicate

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Multipeer Connectivity Implement MCSessionDelegate // Received Resource (void)session:(MCSession *) sessiondidFinishReceivingResourceWithName:(NSString*) resourceName fromPeer:(MCPeerID *)peerID atURL:(NSURL *)localURL withError:(NSError *)error { // completed transfer } Step 5: Communicate

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Multipeer Connectivity Implement MCSession // Leave Session [session disconnect]; Step 5: Connection Status

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Multipeer Connectivity Implement MCSessionDelegate // Someone left the session -(void) session:(MCSession *) peer:(MCPeerID *)peerID didChangeState:(MCSessionState)state; { // MCSessionStateNotConnected // MCSessionStateConnecting // MCSessionStateConnected } Step 5: Connection Status

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Multipeer Connectivity Implement MCSession // handle changes on the main thread dispatch_async(dispatch_get_main_queue(), ^{ [self doThingWithData]; }); Step 5: Communicate !

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D V M Multipeer Connectivity

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D V M emo inimum iable Multipeer Connectivity

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Multipeer Connectivity Demo

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Multipeer Connectivity Demo Bob Mary Bob Mary Jay

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Multipeer Connectivity Demo Bob Mary Bob Mary Jay

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Multipeer Connectivity Demo Bob Mary Jay

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Multipeer Connectivity Demo Bob Mary Jay

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Multipeer Connectivity Demo Bob Mary Jay

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Multipeer Connectivity Demo Bob Mary Jay

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Multipeer Connectivity Demo

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Extra Credit Some things we didn’t cover •Programmatic advertising, discovery and session joining (app specific) •Streaming data •Sending resources !

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Higher Learning Topics to Google •NSHipster •WWDC 2013 (Talk 708) •WWDC 2014 (Talk 709) •objc.io #8 Quadcopter Project •Apple Docs (MP Framework)

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@jaythrash [email protected] http://jaythrash.com/talks

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Thanks! @jaythrash [email protected] http://jaythrash.com/talks