So far no keep-alive messages are sent when GET_PARAMETERS is not supported by
the server. Change this to fall back to sending OPTIONS as keep-alive message,
which is the default keep-alive message in the SAT>IP specification. As
RFC2326 does not enforce a specific command as keep-alive message this shall
be valid for any compliant RTSP server.
Signed-off-by: Julian Scheel <julian@jusst.de>
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>