دانلود رایگان مقاله انگلیسی آنالیز CoAP به عنوان حامل در اینترنت اشیای محیطی - IEEE 2018

Abstract:

Internet of Things (IoT) is a concept where the physical world is integrated into the digital world. In IoT, Internet connected devices are able to observe and act. Furthermore, data observations from these devices are linked with cloud based digital services to enable smart decision-making. IoT is seen as the underpinning for smart cities, with multiple services including intelligent traffic management, and effective resource management (e.g. energy or water). The benefits and potential of IoT are clear, resulting in significant uptake. However, numerous factors still hamper its growth. These factors include performance of networks and edge sensing devices, up to developing appropriate applications, all done in a secure and reliable manner. Data communication can typically occur over various networks and protocols, depending on the context of deployment and operation. This paper focuses on validating the Constrained Application Protocol (CoAP) in a low power personal area network to determine if CoAP is an effective application protocol in an IoT environment. Experiments were conducted in the context of the TRESCIMO testbed through which CoAP enabled devices and gateways communicate to IoT platforms. The experiments focused on measuring the efficiency of communication in an environment with poor connectivity. Experimental results show that CoAP is an efficient transport in low signal strength environments.

5. Conclusions

Experiments were conducted to verify if CoAP is an effective protocol for wireless machine-to-machine and IoT networks. The experiments were conducted on an IoT testbed (TRESCIMO) that supports a “plug-and-play” experimental environment. In the context of this paper, energy sensing devices (plugs) communicated to the gateway, over a constrained network, using CoAP as protocol. Signal strength between the devices was changed for the delivery of messages. The time taken to deliver the messages at a specific signal strength was compared to the baseline delivery time at a good quality signal strength. The results indicated that CoAP is an efficient protocol and is able to operate in a low signal strength environment. At all signal strengths, CoAP based observations were delivered. However, at poorer signal strengths, it was noticeable that the delivery of observations was negatively impacted more often than at better signal to noise ratios. The fact that observations were still delivered, indicates that CoAP can successfully be used in different environments, including where connectivity is challenging.