Toward IoT : Implementation of WSN based MQTT Data Protocol

Abstract: Human seeks the maximum profits with least efforts in each and every single life aspect. The development of technology starting with the machine-to-machine concept to reduce human interface with manufacturing processes, hence reducing errors, cost and time. The development enters a new era of connecting those machines and devices to internet, and furthermore make part of data processing and analysis at those machine or devices parts. This concept is what is known nowadays as the Internet of Things (IoT). In this thesis, design for a proposed system is introduced. MQTT messaging protocol used as the data exchange protocol to aggregate the data from WSN that incorporated local and remote sensor. ATmega 328 microcontroller unit, NodeMCU development board, SIM800L GSM module and DHT11 sensor modules where used to implement the nodes while Raspberry Pi 3B was used to implement a gateway that acts as the MQTT broker in order to aggregate the data. The proposed system has been implemented and tested successfully. The power consumption for the remote sensor nodes consumed only 20 mWh and the response time for the data transferred within the system’s network from the remote sensor node to the server is about 7 milliseconds with a total error of 0.11%. The system shows an excellent performance and provide a simple solution to link remote sensors which are out of the gateway’s local network coverage.