private async Task SendDiscoveryRequestAsync()
{
using (UdpClient client = new UdpClient(PORT_NUMBER)
{
EnableBroadcast = true
})
{
var discoveryJson = JObject.FromObject(new
{
system = new { get_sysinfo = (object)null },
emeter = new { get_realtime = (object)null }
}).ToString(Newtonsoft.Json.Formatting.None);
var discoveryPacket = SmartHomeProtocolEncoder.Encrypt(discoveryJson).ToArray();
var bytes = discoveryPacket.Skip(4).ToArray();
int sentBytes = await client.SendAsync(bytes, bytes.Length, new IPEndPoint(IPAddress.Broadcast, PORT_NUMBER)).ConfigureAwait(false);
//int sentBytes = client.Send(bytes, bytes.Length, new IPEndPoint(IPAddress.Broadcast, PORT_NUMBER));
// no bytes sents
if (sentBytes == 0)
{
throw new InvalidOperationException();
}
}
}
private async Task ReceiveAsync(int waitTimeOutInMs)
{
if (discoveryComplete) //Prevent ObjectDisposedException/NullReferenceException when the Close() function is called
{
return;
}
UdpClient udpListener = new UdpClient(PORT_NUMBER)
{
EnableBroadcast = true
};
// set timeout
//udpListener.Client.ReceiveTimeout = Math.Max(waitTimeOutInMs, 100);
//IPEndPoint ip = default;
//byte[] buffer = udpListener.Receive(ref ip);
UdpReceiveResult response = await udpListener.ReceiveAsync().ConfigureAwait(false);
IPEndPoint ip = response.RemoteEndPoint;
var message = Encoding.ASCII.GetString(SmartHomeProtocolEncoder.Decrypt(response.Buffer));
try
{
TPLinkSmartDevice device = null;
dynamic sys_info = ((dynamic)JObject.Parse(message)).system.get_sysinfo;
string model = (string)sys_info.model;
if (model != null)
{
if (model.StartsWith("HS110", StringComparison.OrdinalIgnoreCase))
{
device = new TPLinkSmartMeterPlug(ip.Address.ToString());
}
else if (model.StartsWith("HS", StringComparison.OrdinalIgnoreCase))
{
device = new TPLinkSmartPlug(ip.Address.ToString());
}
else if (model.StartsWith("KL", StringComparison.OrdinalIgnoreCase) || model.StartsWith("LB", StringComparison.OrdinalIgnoreCase))
{
device = await TPLinkKL130.CreateNew(ip.Address.ToString());
}
// new device found, store in list and raise event
if (device != null)
{
DiscoveredDevices.Add(device);
OnDeviceFound(device);
}
}
}
catch (RuntimeBinderException ex)
{
//discovered wrong device
Debug.WriteLine(ex.Message);
}
finally
{
// ensure the socket is closed even if exception happenned
udpListener.Dispose();
}
discoveryComplete = true;
}
