UnityHub, AsyncEvent, AsyncTimeout, AsyncSocket.

c#, boo or unityScript.

IEnumerable testTimeout() {
    AsyncTimeout timeout = AsyncTimeout.WithStart(100);
    yield return hub.Sleep(200);
    timeout.Cancel(false);
    if (timeout.Timeout) {
        msg += "testTimeout ok" + CR;
    }
}

coroutines can channel each other.

use non-blocking socket, No need thread to support;
Support connect, send, read timeout;