The number of building sites increased considerably these few last years. Emerging countries invest more and more in building and construction sites to overcome the need of citizens like education, residential and administration buildings. Such sites should be equipped with evacuation systems to allow bricklayers and other persons to be evacuated quickly. The lack of such mechanisms makes the life of billion of citizens in a danger. This problem could be addressed by building a novel evacuation emergency application in Internet of Things (IoT) devices with Low Power Wide Area Networks (LP W AN). One of the known LP W AN networks is Long Range (LoRa) network. To overcome the need of peer to peer communication between devices, IEEE.802.15.4 technology and particulary 6LowPAN could be used to allow devices to communicate in a mesh network. Our work is motivated by the deployment of an Emergency Evacuation Systems (EES) in building sites.