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Several wireless sensor network applications are emerging in areas ranging from defense, security, to health or smart homes. Their goal is often to monitor a geographic area and when a sensor detects a feared event, it informs the sink using an alarm message. When such an event happens, the application needs to react with finite bounded and known delays, which are hard real-time constraints. To our knowledge only few works on communication protocols deal with such constraints. Our work deals with routing based 2-dimensional network topologies and event based alarm messages being delivered in real time at the destination or sink node. This work proposes and simulates a new network layer based hard real time protocol, which assumes a collision free known delay MAC (medium access control) layer.