This comparison demonstrates that each of the protocols has its domain of superior performance and neither dominates the other for the entire range of operating conditions.
Subsequently, we use these schedulability conditions to quantitatively compare the average case behavior of the protocols. For both protocols, we first derive the schedulability conditions under which the transmission deadlines of a given set of synchronous messages can be guaranteed. Timed token protocols do not provide for priority arbitration but ensure that the maximum access delay for a station is bounded. In a priority driven protocol, messages are assigned priorities and the protocol ensures that messages are transmitted in the order of their priorities. Both these protocols use a token to control access to the transmission medium. In this paper, we study two token ring protocols, the priority driven protocol and the timed token protocol, for their suitability for hard real-time systems. The ability to guarantee the deadlines of synchronous messages while maintaining a good aggregate throughput is an important consideration in the design of distributed real-time systems. Performance comparison of token ring protocols for hard- real-time communication This result of this study is the enhancement of data quality and reliability using MQTT protocol. This study is also completed by interface web-based and mobile for online monitoring. Data acquisition was done in real-time and stored in MySQL database. This study used temperature and humidity sensors because the physical parameters are often needed as parameters of environment condition. This study proposes the utilization of MQTT as a communication protocol, which is one of data communication protocols for IoT. Lately, researchers have developed a lot of communication protocols for IoT, of which each has advantages and disadvantages. Therefore, an appropriate communication protocol is required to resolve these problems. The need of high quality data is increasing to the extent that data monitoring and acquisition system in real time is required, such as smart city or telediagnostic in medical areas. The Internet of Things (IoT) provides ease to monitor and to gain sensor data through the Internet.
IoT real time data acquisition using MQTT protocolĪtmoko, R.