/// <summary>
/// Try to find ISCP devices on network.
/// </summary>
/// Waits for <paramref name="timeout"/> seconds, then returns all devices found,
/// in form of a list of <see cref="IReceiver"/>s.
public static List <IReceiver> Discover(double timeout, Func <IPAddress, int, string, IReceiver> constructor)
{
int onkyoPort = 60128;
byte[] onkyoMagic = (new EiscpPacket("!xECNQSTN")).Bytes;
var foundReceivers = new List <IReceiver>();
// Broadcast magic
Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
using (socket)
{
socket.Blocking = false; // So we can use Poll
socket.EnableBroadcast = true;
socket.Bind(new IPEndPoint(IPAddress.Any, 0));
socket.SendTo(onkyoMagic, new IPEndPoint(IPAddress.Broadcast, onkyoPort));
EndPoint addr = new IPEndPoint(IPAddress.Broadcast, onkyoPort);
byte[] data = new byte[1024];
int read = 0;
while (true)
{
int microsecondTimeout = (int)(timeout * 1000000);
if (!socket.Poll(microsecondTimeout, SelectMode.SelectRead))
{
break;
}
read = socket.ReceiveFrom(data, ref addr);
string response = Encoding.ASCII.GetString(EiscpPacket.Parse(data));
// Return string looks something like this:
// !1ECNTX-NR609/60128/DX
GroupCollection info = Regex.Match(response.Trim(),
@"!" +
@"(?<device_category>\d)" +
@"ECN" +
@"(?<model_name>[^/]*)/" +
@"(?<iscp_port>\d{5})/" +
@"(?<area_code>\w{2})/" +
@"(?<identifier>.*)"
).Groups;
int port = Int32.Parse(info["iscp_port"].Value);
string model = info["model_name"].Value;
// Give the user a ready-made receiver instance. It will only
// connect on demand, when actually used.
IReceiver receiver = constructor((addr as IPEndPoint).Address, port, model);
foundReceivers.Add(receiver);
}
}
return(foundReceivers);
}
/// Return the next message sent by the receiver, or, after
/// <paramref name="timeout"/> has passed, return <c>null</c>.
public virtual byte[] Get(double timeout = 0.1)
{
EnsureSocketConnected();
int microsecondTimeout = (int)(timeout * 1000000);
if (commandSocket.Poll(microsecondTimeout, SelectMode.SelectRead))
{
byte[] headerBytes = new byte[16];
commandSocket.Receive(headerBytes);
Header header = EiscpPacket.ParseHeader(headerBytes);
byte[] message = new byte[header.messageSize];
commandSocket.Receive(message);
return(IscpMessage.Parse(message));
}
return(null);
}
