| conn | The connection that data was received on. | 
| channelId | The channel that data was received on. | 
| receivedSize | The amount of data received. | 
This virtual function can be overridden to perform custom functionality when data is received for a connection.
By default this function calls HandleData() which will process the data and invoke message handlers for any messages that it finds.
public virtual void OnData(NetworkConnection conn, int channelId, int receivedSize) { conn.TransportRecieve(msgBuffer, receivedSize, channelId); }