Here's a fix for MargieBotWebSocket to eliminate TrimStuffIDontKnowWhatItEvenIs

[AronDavis]

The Listen method is not properly using _webSocket.ReceiveAsync.
You're getting bad JSON because you're not checking result.EndOfMessage. So you're getting a partial message and then the "leftovers" are the things you're trying to "trim".

Below is an example solution.

private async Task Listen()
{
	ArraySegment<Byte> buffer = new ArraySegment<byte>(new Byte[1024]);
	WebSocketReceiveResult result = null;

	while (_webSocket.State == WebSocketState.Open)
	{
		using (var ms = new MemoryStream())
		{
			do
			{
				result = await _webSocket.ReceiveAsync(buffer, CancellationToken.None);

				if (result.MessageType == WebSocketMessageType.Close)
				{
					await _webSocket.CloseAsync(WebSocketCloseStatus.NormalClosure, string.Empty, CancellationToken.None);
					break;
				}
				else
				{
					ms.Write(buffer.Array, buffer.Offset, result.Count);
				}
			}
			while (!result.EndOfMessage);

			ms.Seek(0, SeekOrigin.Begin);

			if (result.MessageType == WebSocketMessageType.Text)
			{
				using (var reader = new StreamReader(ms, Encoding.UTF8))
				{
					var stringData = await reader.ReadToEndAsync();

#if DEBUG
					Console.WriteLine($"Receive: {stringData}");
#endif

					OnMessage?.Invoke(this, stringData);
				}
			}
		}
	}
}

[AronDavis]

#31 is the pull request to implement this.