Development of Wireless IOT Communication System Based on COAP
Wireless Internet of Things (IoT) devices share several features such as limited energy supply, low computing power, limited memory size, and vulnerable radio communication network. IETF proposed the Constrained Application Protocol (CoAP) for this type of network. This paper presents implementation of CoAP to embedded IoT devices used for smart Energy Storage System (ESS) under microgrid environment. Confirmable message type was adopted to provide reliable communication. Since the frame size of IEEE 802.15.4 physical layer was limited to 127 bytes, the header of 6LoWPAN and UDP was compressed to reduce fragmentation and reassembly overhead. Performance of the communication service was tested by measuring round trip time between two end nodes of developed system.
Index Terms— Constrained Application Protocol, Internet of Things, IEEE 802.15.4, Microgrid.