The method of Internet of Things access and network communication based on MQTT Abstract   With the rise of intelligent hardware and the rapid development of the Internet of Things, its security issues are also facing severe challenges. Internet of things devices are often limited devices with limited computing power and limited resource space. Therefore, a lightweight security solution needs to be designed specifically for this purpose. The purpose of this article is to study the method of IoT device access and network communication based on MQTT (Message Queuing Telemetry Transport). Based on the MQTT protocol and the theoretical foundation of WiFi technology, this paper proposes a WiFi distribution network optimization scheme and terminal communication method, and sets up a system test platform. The experiment proves that the communication method of the IoT terminal equipment based on MQTT proposed in this paper can reliably and flexibly implement the communication function of the equipment and meet the communication needs of the IoT system. According to the performance of the WiFi access configuration method, this paper tests the performance of transmitting information with lengths of 10 bytes, 30 bytes, 50 bytes, and 70 bytes, respectively, the average time of the distribution network is 0.6692s, 1.3546s, 2.8600s, 4.7319s, all rates are 100%. It can be seen that the system has a higher efficiency in network distribution.

IoT Protocols for Lowpower Massive IoT: A Communication Perspective The constantly growing number of resourcelimited MTC (MachineType Communication) devices is challenging both the telecommunication operators as well as industrial companies to efficiently design communication technologies, protocols, and enddevices for data transmissions in the upcoming 5G and beyond wireless communication networks. As the communication technologies for mMTC (massive Machine Type Communications)massive IoT (Internet of Things) attracted significant attention over the past years due to the extended communication range and improved lifetime of batteryoperated devices, the debate turned from the communication parameters of available LowPower WideArea (LPWA) technologies towards the implementation issues related to efficient data transmissions with respect to certain level of Quality of Service (QoS). In this regard, this paper aims to analyze already introduced communication protocols (i.e., TCP, UDP, CoAP (Constrained Application Protocol), and MQTT (Message Queuing Telemetry Transport)) possible to use for data transmission in massive IoT scenarios. Along with the highlights of the protocols in question, a practical implementation is done using the emerging cellular IoT standard, namely, NBIoT (Narrowband IoT). Out of the obtained data, the focus is primarily given to the sidebyside comparison of protocolsxe2x80x99 overheads and the subsequent data usage as the amount of transmitted data is deriving the monthly fees.