In this demo we present the GinLITE medium access control protocol. GinLITE is a generic open source medium access control protocol designed to offer time-critical and reliable data delivery. GinLITE is easily extensible and customisable and is intended to be used as a building block for research sensor networks that have strict performance requirements. The protocol was developed as a component for the GINSENG system, a system designed for industrial process automation and control applications. A simple application is presented for the purpose of demonstrating the capabilities of GinLITE.