Developing Android Applications with Adobe AIR

P2P Over a Local Network

If your local network supports broadcasting, you can create peer-to-peer direct routing. All the clients need to be on the same subnet, but you do not need to manage them. Verify that your devices have WiFi enabled and are using the same network.

The code to create a peer-to-peer application with RTMFP is quite simple but introduces new concepts. Let’s go over all the steps one at a time.

The connection is established using the flash.net.NetConnection class. Set a listener to receive a NetStatusEvent event. Create the connection by calling the connect function and passing rtmfp as an argument:

import flash.net.NetConnection;
import flash.events.NetStatusEvent;

var connection:NetConnection = new NetConnection();
connection.addEventListener(NetStatusEvent.NET_STATUS, onStatus);
connection.connect("rtmfp:");

Wait for the connection to be established. Then several objects need to be created:

function onStatus(event:NetStatusEvent):void {
    switch(event.info.code) {
        case "NetConnection.Connect.Success" :
            trace("I am connected");
            // object creation can now happen
            break;
    }
}

NetGroup is the group of peers. Its capabilities are defined in the GroupSpecifier. The IPMulticastAddress property stores the IPv4 multicast address. It needs to be in the range 224.0.0.0 through 239.255.255.25. The UDP port should be higher than 1024. A group name is passed in its constructor. Try to make it unique. The IPMulticastMemberUpdatesEnabled property must be set to true for clients to receive ...