Propagação de mensagens com protocolo CoAP em redes LoWPAN com simulador Cooja

Abstract

The IEEE 802.15.4 standard has low cost and forms wireless personal area networks which by adapting the IPv6 protocol over this physical layer, this adaptation is 6LoWPAN. Thus, there is information about assemblies and assemblies and connections to IoT. An application layer closer to the User used in the CoAudio protocol at work and latency analysis of information gathering or sending commands at network points. The routing is done by the RPL protocol and it requires an intermediary to the universe outside the network, the edge router. Interactive messaging methods with CoAP are described, as well as a protocol stack, to take action on LoWPAN network devices. The Contiki OS has softwares that have protocols and has the Cooja simulator, both are at work to simulate three network topologies: straight, triangular and square. Copper plays the role of agent external to the simulated network does not Cooja and thus the Coap has latency measured in the gain of information points of the network that results in exponential growth of time with three resources for more. In the case of a single sensor or sending commands, a latency is linear, also according to the hopping distance of the network edge node. Another conclusion is that as topologies should favor fewer requests simultaneously to the edge of the network, this is record of communication errors with these protocols. An application is built and network nodes are positioned at runtime on the simulator. It proposes solution for energy consumption in lighting.