Multipeer Connectivity Framework

報告⼈人：allenlinli 材料提供：李岡諭 2014.4.10

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⼤大家動⼿手做

• https://dl.dropboxusercontent.com/u/2857188/MCDemo.zip

• 測試是否可以連⼋八個

Wireless mesh networking

• Peer-to-peer connections:

• infrastructure Wi-Fi networks

• peer-to-peer Wi-Fi

• Bluetooth personal area networks

Pros & Cons• Pros

• Without an internet connection

• Location-based communication (nearby)

• Cons

• Sessions currently support up to 8 peers

• Data transfer is slow – especially on Bluetooth

• Can not cross networks in single connection

• Not support background mode

Sending & Receiving Information

• Messages: Text or small serialised objects (NSData)

• Streams: Audio, video, or real-time sensor events

• Resources: Images, movies, or documents.

Build up Connection

Steps

• PeerID

• Session

• Advertise

• Browser

• Accept

_peerID = [[MCPeerID alloc] initWithDisplayName:displayName];

_session = [[MCSession alloc] initWithPeer:_peerID]; _session.delegate = self;

_advertiser = [[MCAdvertiserAssistant alloc] initWithServiceType:@"chat-files" discoveryInfo:nil session:_session]; [_advertiser start];

_browser = [[MCBrowserViewController alloc] initWithServiceType:@"chat-files" session:_session];

Data Transfer

[_appDelegate.mcManager.session sendData:dataToSend toPeers:allPeers withMode:MCSessionSendDataReliable error:&error];

傳輸速度• Bluetooth：

• Bluetooth (Bonjour over Bluetooth)

• Multipeer Connectivity 不是使⽤用 BLE/Bluetooth 4.0 advertisement。

• 猜測：使⽤用 Bluetooth Classic。

• WiFi

• Multipeer Connectivity 不是使⽤用 WiFi Direct。理論上可達 250 Mbps，實測⼤大約 35-50 Mbps。

• 猜測：與 AirDrop ⼀一樣，使⽤用 Adhoc WiFi。上限為 11 Mbps。實測兩台 Mac 的 AirDrop 傳輸⼤大約是 18 Mbps (不同 Wifi 下是 4 Mbps)。

報告完畢，謝謝

感謝李岡諭

Resources

Tutorials

• http://www.appcoda.com/intro-multipeer-connectivity-framework-ios-programming/

• http://code.tutsplus.com/tutorials/exploring-the-multipeer-connectivity-framework-project-setup--mobile-23071

• http://nshipster.com/multipeer-connectivity/