2014.06.26 CocoaHeads - Multipeer Connectivity Framework

1. CocoaHeads Taichung
2014.06.26
RAKI - 丫狸

2. iOS藍⽛牙內網技術
這是⽩白話⽂文

3. Multipeer Connectivity Framework
其實就是 iOS7 的
https://dl.dropboxusercontent.com/u/2857188/MCDemo.zip

4. Multipeer Connectivity Framework
以Blueooth或是Wi-Fi建設起近場網絡
使附近的設備可以彼此聯通
無需通過web server中介處理
相連的節點都能夠安全地傳輸
1 NSData 訊息資料
2 Resources ⽂文件檔案
3 Streaming data 影⾳音串流

5. 在網狀網絡中，所有設備可以彼此直接通信，⽽而無需central hub

6. App 實例
Firechat
iOS
Android
iOS+Android
SDK-P2P網

7. 個⼈人區域網路
NFC?
iBeacon? BLE?
Multipeer?

8. CoreBluetooth 低功耗藍⽛牙框架
Multipeer 網狀網絡框架
MCPeerID：周邊設備。
MCSession：內網會議室。
MCAdvertiserAssistant：廣播給附近的設備（快速版）。
MCBrowserViewController：搜尋附近的設備（快速版）。
MCNearbyServiceAdvertiser：廣播給附近的設備（實作版）。
MCNearbyServiceBrowser：搜尋附近的設備（實作版）。
CBCentralManager 搜尋/連線/處理資料(中央設備)
CBPeripheral 廣播/傳送/接收資料(外部設備)
快速對照

9. CoreBluetooth 低功耗藍⽛牙框架
Multipeer 網狀網絡框架
serviceType(指定連線服務)
foundPeer(發現外部設備)
didReceiveInvitationFromPeer(連接外部設備)
lostPeer(外部設備斷線)
scanForPeripheralsWithServices:nil(指定連線服務)
didDiscoverPeripheral(發現外部設備)
didConnectPeripheral(連接外部設備)
didDisconnectPeripheral(外部設備斷線)
快速對照

10. 要進⼊入程式碼了!
新⼿手上場請多多包涵

11. 1/5 Creating a Peer
_peerID = [[MCPeerID alloc] initWithDisplayName:displayName];
2/5 Creating a Session
_session = [[MCSession alloc] initWithPeer:_peerID];
_session.delegate = self;

12. 3/5 內建廣播
_advertiser = [[MCAdvertiserAssistant alloc]
initWithServiceType:ServiceType
discoveryInfo:nil
session:_session];
[_advertiser start];
4/5 內建搜尋
_browser = [[MCBrowserViewController alloc]
initWithServiceType:ServiceType session:_session];

13. 5/5 開啟⾯面板
[[[appDelegate mcManager] advertiser] setDelegate:self];
[[[appDelegate mcManager] browser] setDelegate:self];
!
[self presentViewController:[[appDelegate mcManager] browser]
animated:YES completion:
^{NSLog(@"打開browser");}];

14. MCBrowserViewControllerDelegate
-(void)browserViewControllerDidFinish:(MCBrowserViewController *)browserViewController
{
NSLog(@"完成browser");
[appDelegate.mcManager.browser dismissViewControllerAnimated:YES completion:nil];
}
!
-(void)browserViewControllerWasCancelled:(MCBrowserViewController *)browserViewController
{
NSLog(@"取消browser");
[appDelegate.mcManager.browser dismissViewControllerAnimated:YES completion:nil];
}

15. Demo：跨協定Peer互通

16. 3/5 實作Advertising
appDelegate.mcManager.NearbyAdvertiser =
[[MCNearbyServiceAdvertiser alloc]
initWithPeer:appDelegate.mcManager.peerID
discoveryInfo:nil
serviceType:appDelegate.mcManager.ServiceType];
appDelegate.mcManager.NearbyAdvertiser.delegate = self;
[appDelegate.mcManager.NearbyAdvertiser startAdvertisingPeer];

17. 4/5 實作Discovering
appDelegate.mcManager.NearbyBrowser =
[[MCNearbyServiceBrowser alloc]
initWithPeer:appDelegate.mcManager.peerID
serviceType:appDelegate.mcManager.ServiceType];
!
appDelegate.mcManager.NearbyBrowser.delegate = self;
[appDelegate.mcManager.NearbyBrowser startBrowsingForPeers];

18. 5/5 實作⾃自訂介⾯面
剩下的交給MCSessionDelegate
foundPeer 函式可收集找到的設備
_session.connectedPeers 可列出已連線設備
-(void)session:(MCSession *)session peer:(MCPeerID *)peerID didChangeState:
(MCSessionState)state
{
NSLog(@"Session for peer: %@, changed state to: %i", peerID, (int)state);
//MCSessionStateNotConnected, // not in the session
//MCSessionStateConnecting, // connecting to this peer
//MCSessionStateConnected // connected to the session}
}

19. MCNearbyServiceBrowserDelegate
-(void)browser:(MCNearbyServiceBrowser *)browser foundPeer:(MCPeerID
*)peerID withDiscoveryInfo:(NSDictionary *)info
{
if (![appDelegate.mcManager.session.connectedPeers containsObject:peerID]{
//TODO:直接邀請
[appDelegate.mcManager.NearbyBrowser
invitePeer:peerID
toSession:appDelegate.mcManager.session
withContext:nil
timeout:0.0];
}

20. MCNearbyServiceAdvertiserDelegate
- (void)advertiser:(MCNearbyServiceAdvertiser *)advertiser
didReceiveInvitationFromPeer:(MCPeerID *)peerID withContext:(NSData
*)context invitationHandler:(void(^)(BOOL accept, MCSession
*session))invitationHandler
{
//TODO:直接同意
!
或是
!
//TODO:⾃自訂詢問
}

21. MCNearbyServiceAdvertiserDelegate
//TODO:⾃自訂詢問
arrayInvitationHandler = [NSArray arrayWithObject:[invitationHandler
copy]];
UIAlertView *alertView = [[UIAlertView alloc]
initWithTitle:peerID.displayName
message:@"Would like to create a session with you"
delegate:self
cancelButtonTitle:@"Decline"
otherButtonTitles:@"Accept", nil];
[alertView show];
//TODO:直接同意
invitationHandler(YES,appDelegate.mcManager.session);

22. UIAlertViewDelegate
- (void) alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
BOOL accept = (buttonIndex != alertView.cancelButtonIndex) ? YES : NO;
//TODO:回答詢問
if(accept) {
NSLog(@"Session accept");
void (^invitationHandler)(BOOL, MCSession *) = [arrayInvitationHandler objectAtIndex:0];
invitationHandler(accept, appDelegate.mcManager.session);
}
else
{
NSLog(@"Session disallowed");
}
}

23. 發送訊息
MCSessionDelegate

24. MCSessionDelegate
// Received data from remote peer
-(void)session:(MCSession *)session didReceiveData:(NSData *)data fromPeer:(MCPeerID *)peerID
{
NSString *message = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
!
NSDictionary *dict = @{@"data": data,@"peerID": peerID
};
[[NSNotificationCenter defaultCenter] postNotificationName:@"MCDidReceiveDataNotification"
object:nil
userInfo:dict];
}

25. MCSessionDelegate
// Start receiving a resource from remote peer
-(void)session:(MCSession *)session didStartReceivingResourceWithName:
(NSString *)resourceName fromPeer:(MCPeerID *)peerID withProgress:
(NSProgress *)progress
// Finished receiving a resource from remote peer
-(void)session:(MCSession *)session didFinishReceivingResourceWithName:
(NSString *)resourceName fromPeer:(MCPeerID *)peerID atURL:(NSURL
*)localURL withError:(NSError *)error

26. MCSessionDelegate
// Received a byte stream from remote peer
-(void)session:(MCSession *)session didReceiveStream:(NSInputStream
*)stream withName:(NSString *)streamName fromPeer:(MCPeerID *)peerID
{
NSLog(@"Session started receiving stream: %@ with name: %@ from peer:
%@", stream, streamName, peerID);
}

27. Demo：⽣生活應⽤用
⺫⽬目標同步 - 出遊規劃分⼯工同步
戰術指導 - 儲存下來還可以有回合制
延伸螢幕 - 再⼤大的投影機都還是有搖滾區
導覽解說 - 更⽣生動即時的旅遊回憶（個⼈人語⾳音導覽機偏向iBeacon)
點餐系統 - 不必架設server很多事都可以在⼩小型區域內快速達成
會議記錄 - 開完會⾼高校產出跨部會記錄表
互動教材 - 學習模式數位化，資料收集可排除網路環境的限制

28. 感謝聆聽
RAKI - 丫狸
raki-fox@msn.com