Gst.Message.new_request_state

function new_request_state(src:Gst.Object, state:Gst.State):Gst.Message {
    // Gjs wrapper for gst_message_new_request_state()
}

This message can be posted by elements when they want to have their state changed. A typical use case would be an audio server that wants to pause the pipeline because a higher priority stream is being played.