MULTIPEER CONNECTIVITY
YO, WANNA TALK?
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MULTIPEER CONNECTIVITY
PLAN
▸ Pourquoi?
▸ Comment?
▸ Quoi?
2

MULTIPEER CONNECTIVITY
POURQUOI?
▸ Mobilité accrue
▸ Hétérogénéité des accès plutôt que des méthodes
▸ Zéro configuration
3

MULTIPEER CONNECTIVITY
BT Advertisement / Discovery
Data Exchange
Get Ad-hoc WiFi Settings & connect Setup Ad-hoc WiFi Network
Create Session
Join Session
Session Data Exchange
COMMENT?
▸ “Discovery” Bluetooth
▸ Débit et stabilité WiFi
▸ Zéroconf / Bonjour
4

MULTIPEER CONNECTIVITY
QUOI?
▸ Réseau
▸ MCAdvertiserAssistant
▸ MCNearbyServiceAdvertiser /
MCNearbyServiceBrowser
▸ Peers
▸ MCSession
▸ MCPeerID
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MULTIPEER CONNECTIVITY
CAVEATS
▸ Limitations réseau (évidemment) : portée, débit, etc
▸ Une session contient au plus 8 participants
▸ Peu de fonctions avancées
▸ Mac - iPhone - iPad - Watch - TV
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MULTIPEER CONNECTIVITY
CRÉER / REJOINDRE UNE SESSION
▸ Service Type (NSString)
▸ Peer Display Name (NSString)
▸ MCNearbyServiceAdvertiser -> MCSession
▸ MCNearbyServiceBrowser -> MCSession
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static NSString * const AppServiceType = @“chat-service";
NSString *dName = [[UIDevice currentDevice] name];
MCPeerID *localPeerID = [[MCPeerID alloc]
initWithDisplayName:dName];
Service Type & Local Peer
MULTIPEER CONNECTIVITY 8

MCNearbyServiceAdvertiser
*advertiser = [[MCNearbyServiceAdvertiser alloc]
initWithPeer:localPeerID
discoveryInfo:nil
serviceType:AppServiceType];
advertiser.delegate = self;
[advertiser startAdvertisingPeer];
Advertising
MULTIPEER CONNECTIVITY 9

- (void) advertiser:(MCNearbyServiceAdvertiser *)advertiser
didReceiveInvitationFromPeer:(MCPeerID *)peerID
withContext:(NSData *)context
invitationHandler:
(void(^)(BOOL accept, MCSession *session))invitationHandler
{
if(self.session == nil) {
self.session = [[MCSession alloc] initWithPeer:localPeerID
securityIdentity:nil
encryptionPreference:MCEncryptionNone];
}
invitationHandler(YES, self.session);
}
Advertising Attack of The Clones
MULTIPEER CONNECTIVITY 10

MCNearbyServiceBrowser
*browser = [[MCNearbyServiceBrowser alloc]
initWithPeer:localPeerID
serviceType:AppServiceType];
browser.delegate = self;
Discovery
MULTIPEER CONNECTIVITY 11

// optional GUI
MCBrowserViewController *browserViewController =
[[MCBrowserViewController alloc]
initWithBrowser:browser
session:session];
browserViewController.delegate = self;
[self presentViewController:browserViewController
animated:YES
completion:
^{
[browser startBrowsingForPeers];
}];
Discovery Harder
MULTIPEER CONNECTIVITY 12

MULTIPEER CONNECTIVITY
MCSESSION IS LIVE!
▸ Message == NSData
▸ Blobs
▸ NSSecureCoding Objects
▸ Contenu d’une ressource par une NSURL (file ou http)
▸ NSInputStream/NSOutputStream (ouep)
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MULTIPEER CONNECTIVITY
DEMO
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MULTIPEER CONNECTIVITY
QUESTIONS?
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