CoAP(Constrained Application Protocol) is a client-server protocol which can utilize both TCP and UDP to connect small, semi-intelligent devices within the Internet of Things (IoT) applications. This lightweight RESTful protocol is specially optimized for deployments with a high number of end devices within the network.
CoAP is designed to meet specialized requirements such as multicast support, low overhead, simplicity, being deeply embedded, less memory consumption and power supply compared to other internet devices.