How do you create a client using websocket-sharp? - websocket

Question

I'm using ClientWebSocket to subscribe to a REST service but want to be able to use websocket-sharp instead.
static async void MonitorISY(string IPAddress, string userName, string password, IMessageWriter writer)
{
ClientWebSocket client = new ClientWebSocket();
client.Options.AddSubProtocol("ISYSUB");
client.Options.SetRequestHeader("Origin", "com.universal-devices.websockets.isy");
var auth = Convert.ToBase64String(Encoding.Default.GetBytes(userName + ":" + password));
client.Options.SetRequestHeader("Authorization", "Basic " + auth);
await client.ConnectAsync(new Uri("ws://" + IPAddress + "/rest/subscribe"), CancellationToken.None);
var receiveBufferSize = 512;
byte[] buffer = new byte[receiveBufferSize];
writer.Clear();
while (true)
{
var result = await client.ReceiveAsync(new ArraySegment<byte>(buffer), CancellationToken.None);
var resultJson = (new UTF8Encoding()).GetString(buffer);
writer.WriteLn(resultJson);
writer.WriteLn();
}
}
Here is my websocket-sharp attempt. When ws.Connect(); is called, I'm getting a Not a WebSocket handshake response error message. In the working code, I have to setup the Origin, SubProtocol and the RequestHeader. I think I'm doing that correctly for the websocket-sharp code, with the exception of the Request Header. I've been unable to find a working example that specifies authentication.
using (var nf = new Notifier())
using (var ws = new WebSocket("ws://172.16.0.40/rest/subscribe", "ISYSUB"))
{
ws.Log.Level = LogLevel.Trace;
var username = "user";
var password = "pass";
ws.Origin = "com.universal-devices.websockets.isy";
ws.SetCredentials(username, password, true);
ws.OnOpen += (sender, e) => ws.Send("Hi, there!");
ws.OnMessage += (sender, e) =>
nf.Notify(
new NotificationMessage
{
Summary = "WebSocket Message",
Body = !e.IsPing ? e.Data : "Received a ping.",
Icon = "notification-message-im"
}
);
ws.OnError += (sender, e) =>
nf.Notify(
new NotificationMessage
{
Summary = "WebSocket Error",
Body = e.Message,
Icon = "notification-message-im"
}
);
ws.OnClose += (sender, e) =>
nf.Notify(
new NotificationMessage
{
Summary = String.Format("WebSocket Close ({0})", e.Code),
Body = e.Reason,
Icon = "notification-message-im"
}
);
ws.Connect();

Answer 1

I think the best example is https://github.com/sta/websocket-sharp/tree/master/Example3
Although I did have to make a few tiny adjustments to get it to compile in Visual Studio 2017 Enterprise.
The index.html is based on http://www.websocket.org/echo.html