( resource radius_handle )
After the Radius request has been constructed, it is sent by
The radius_send_request() function sends the request and
waits for a valid reply, retrying the defined servers in round-robin
fashion as necessary.
If a valid response is received, radius_send_request()
returns the Radius code which specifies the type of the response. This will
typically be RADIUS_ACCESS_ACCEPT,
RADIUS_ACCESS_CHALLENGE. If no valid response is
received, radius_send_request() returns FALSE.