Design and Implementation of Node Gateway with MQTT and CoAP Protocol for IoT Applications

Abstract

Internet of Things (IoT) model has limited interaction because devices must communicate within the same domain. In addition, if there is a new type of sensor relevant to a domain, the sensor cannot communicate because of domain differences. Because of these problems a system is needed to communicate between protocol domains. Communication between the multi-protocol domains of CoAP, MQTT and Websocket on the device can be achieved by creating a gateway for each protocol, then connecting with a broker. Each data from the sensor will be processed into ESP32 as a microcontroller. To overcome the problem of the differences in multi-protocol domains, namely by making a gateway on a one sensor that uses the MQTT Protocol and other sensors using the CoAP protocol. The sensor data is processed by the Raspberry Pi as a multiprotocol gateway. Then the data are multiplexed and be sent to the database server using the Web socket Protocol. From the testing result show that the CoAP protocol has a better performance than MQTT protocol. The delay of CoAP protocol achieved 28.80 ms and the delay of MQTT protocol is 39.59 ms.