Function gstreamer_rtsp_sys::gst_rtsp_watch_send_messages

pub unsafe extern "C" fn gst_rtsp_watch_send_messages(
    watch: *mut GstRTSPWatch, 
    messages: *mut GstRTSPMessage, 
    n_messages: c_uint, 
    id: *mut c_uint
) -> GstRTSPResult

This is supported on crate feature v1_16 only.