how to handle keep alive connection in android Service

I am using asmack for an android IM application, where I am using remote service with AIDL interface.

Inside of onStartCommand method of my service I write code as below. I create connection and then login using that. When anyone run my application inside onCreate method of main activity of my application run my service getApplicationContext.StartService(serviceIntent). It's working fine, but after few minutes (sometimes 10 minutes and some time more than ten) messageListener that I attach inside of service stops to receive messages. But I know that the connection exist, because same time I use xmppConnection to send message it's sending message to user B but it not listening messages from user B. I don't know why my listener stop hearing message.

public int onStartCommand(final Intent intent, final int flags, final int startId) {
    ConnectionConfiguration config = new ConnectionConfiguration(URL, MyPort, Host);
    xmppConnection = new XMPPConnection(config);
    xmppConnection.connect();
    xmppConnection.login("someid@sample.com", "testpass");
    xmppConnection.addPacketListener(myMessageListener, new PacketTypeFilter(Message.class));
    return START_STICKY;
}
private PacketListener myMessageListener = new PacketListener() {
    public void processPacket(Packet packet) {
        Message msg = (Message) packet;
    }
}

Please guide.