| Abstrakt: |
The Internet of Things (IoT) based smart strategies are often resource constrained with respect to energy, computation and memory. Outdated communication protocols are inappropriate for IoT ecosystem because of large overhead, lack of Quality of Service (QoS) and increased complexity. As billions of devices are required to be deployed over diverse applications, the IoT communication system acts as a prominent aspect and so the selection of suitable IoT communication protocol is highly essential. Also, there is a greater need of analysing the protocol behaviour under diverse network conditions. Hence to select a suitable protocol by addressing the limitations, this research paper mainly focuses on comparing lightweight application layer protocols, including Message Queuing Telemetry Transport (MQTT), Constrained Application Protocol (CoAP) and MQTT for sensor Network (MQTTSN). Evaluating the performance of protocol libraries in real environment is highly significant because it helps to discover potential interoperability and compatibility challenges. Also, it can reveal the protocol's ability in handling scalability and its support in dealing a number of devices efficiently. A testbed named "ProtoLab" has been created for evaluating the performances of CoAP, MQTT and MQTTSN protocols under variable network condition. Using the testbed, the client and server can exchange the data packets under the variable network condition created with the help of network emulator. The data packets can be received and exported using the wireshark application to create a dataset for analysis. Different parameters like round trip time, duplication, round trip reliability, server response time, reliability towards the client to server and client overhead are analysed by configuring loss, corruption, reordering and network delay in the network emulator using wide area network emulator (WANEM) to evaluate the performance of IoT communication protocols. Variable network conditions are considered and analysed using real-time ProtoLab testbed by varying the parameters. The results and observations analyzed through this research can support IoT application developers in making informed decisions while selecting communication protocols for different applications. On analysing the parameters under diverse network conditions, the MQTTSN protocol performs comparatively better in terms of resource efficient delivery in constrained environment. Meanwhile, the MQTT protocol is analysed to be better when concerned with reliability. [ABSTRACT FROM AUTHOR] |
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