def add_tcp_callback(port, callback, threaded_callback=False):
    """
    Adds a unix socket server callback, which will be invoked when values
    arrive from a connected socket client. The callback must accept two
    parameters, eg. ``def callback(socket, msg)``.
    """
    _rpio.add_tcp_callback(port, callback, threaded_callback)
Adds a unix socket server callback, which will be invoked when values
    arrive from a connected socket client. The callback must accept two
    parameters, eg. ``def callback(socket, msg)``.