This report provides an overview over our efforts in continuing the workstarted by two previous students with the goal of implementing a fullWirelessHART network stack on Atmel wireless sensor nodes. This is acollaborative project between the University of Oslo, Statoil and SINTEF.This report provides the reader with an introduction to the availableprotocols and technologies in use in the world of wireless sensor networks.After giving the reader an introduction to wireless sensor networks andthe underlying physical and link layer characteristics of IEEE 802.15.4we explore WirelessHART in more detail along with an analysis of theimplemented code base and how it performs in our test scenarios.After carefully reviewing the implementation and final code base, it isclear that we have made advances in this area. In particular, our approachto the implementation of a WirelessHART Gateway was found to resultin measurable improvements to the operation of the network and the continuedeffort to provide a full-fledged implementation of a WirelessHARTNetwork. Our methods to address the protocol stack in the WirelessHARTField Devices resulted in an increase in stability and several new featureswhich provide yet another step in the right direction.It also seems evident that although our work has resulted in importantupdates and improvements in this project, we have not exhausted this areaof research. More work should be performed to explore this area furtherin order to further improve and extend the implementation of both theWirelessHART Field Devices and the WirelessHART Gateway.