In the Internet of Things era, data-backed insights are being used by industries and organisations to deliver value. It will provide boundless services to increase productivity and efficiency in the future; however, there are still security issues associated with IoT devices. This paper discusses IoT security issues and challenges using MQTT and CoAP protocols. As a first step, the cybersecurity hierarchy of the Internet of Things and its infrastructure will be examined. Our next topic will be the Internet of things devices and their weaknesses. There will also be a discussion of the types of protocols on the Internet of Things, for example, HTTP, DDS and XMPP, most of which originated from Internet protocols. In addition to highlighting MQTT and CoAP and comparing them, the study clarifies all previous studies that looked at those protocols. Our final paragraph discussed cybersecurity challenges on the Internet of Things and MQTT and CoAP as the future of IoT.

Keywords : MQTT, CoAP, IoT, protocols , cybersecurity , HTTP,DDS ,XMPP