async Task <IPEndPoint> ResolveIPEndPoint(CoapClientConnectOptions connectOptions)
{
if (IPAddress.TryParse(connectOptions.Host, out var ipAddress))
{
return(new IPEndPoint(ipAddress, connectOptions.Port));
}
else
{
#if NETSTANDARD1_3
await Task.FromResult(0);
throw new NotSupportedException("Resolving DNS end points is not supported for NETSTANDARD1_3. Please pass IP address instead.");
#else
var hostIPAddresses = await Dns.GetHostAddressesAsync(connectOptions.Host).ConfigureAwait(false);
if (hostIPAddresses.Length == 0)
{
throw new CoapCommunicationException("Failed to resolve DNS end point", null);
}
// We only use the first address for now.
return(new IPEndPoint(hostIPAddresses[0], _connectOptions.Port));
#endif
}
}
public async Task ConnectAsync(CoapClientConnectOptions options, CancellationToken cancellationToken)
{
_connectOptions = options ?? throw new ArgumentNullException(nameof(options));
var transportLayer = options.TransportLayerFactory?.Invoke();
if (transportLayer == null)
{
throw new InvalidOperationException("No CoAP transport layer is set.");
}
cancellationToken.ThrowIfCancellationRequested();
_transportLayerAdapter = new CoapTransportLayerAdapter(transportLayer, _logger);
try
{
var transportLayerConnectOptions = new CoapTransportLayerConnectOptions
{
EndPoint = await ResolveIPEndPoint(options).ConfigureAwait(false)
};
await _transportLayerAdapter.ConnectAsync(transportLayerConnectOptions, cancellationToken).ConfigureAwait(false);
}
catch (Exception)
{
_transportLayerAdapter.Dispose();
throw;
}
}
public async Task ConnectAsync(CoapClientConnectOptions options, CancellationToken cancellationToken)
{
if (options is null)
{
throw new ArgumentNullException(nameof(options));
}
_connectOptions = options;
if (_dtlsClient != null)
{
_dtlsClient.OnDatagramReceived -= OnDatagramReceived;
_dtlsClient.Dispose();
}
_udpClient?.Dispose();
await ResolveIPEndpointAsync().ConfigureAwait(false);
ConvertCredentials();
// ! Match the local address family with the address family of the host!
_udpClient = new UdpClient(0, _ipEndPoint.AddressFamily);
_dtlsClient = new Waher.Security.DTLS.DtlsOverUdp(_udpClient, Waher.Security.DTLS.DtlsMode.Client, null, null);
_dtlsClient.OnDatagramReceived += OnDatagramReceived;
}
public async Task ConnectAsync(CoapClientConnectOptions options, CancellationToken cancellationToken)
{
_connectOptions = options ?? throw new ArgumentNullException(nameof(options));
_transportLayerAdapter = new CoapTransportLayerAdapter(options.TransportLayer, _logger);
var transportLayerConnectOptions = new CoapTransportLayerConnectOptions
{
EndPoint = await ResolveIPEndPoint(options).ConfigureAwait(false)
};
await _transportLayerAdapter.ConnectAsync(transportLayerConnectOptions, cancellationToken).ConfigureAwait(false);
}
