native socket_is_writable(_socket, _timeout = 100000);
Amount of time to block the call waiting for the socket to be marked as writable or
for the timeout to expire, in µSeconds (1 sec = 1000000 µsec)
Checks if a socket is marked as writable.
Use this function to check if a nonblocking socket is ready to be used.
Set _timeout to 0 avoid blocking the call.
An UDP socket is always writable.
1 if the socket is marked as writable