Abstract
Message Queuing Telemetry Transport for Sensor Networks (MQTT-SN) and Constrained Application Protocol (CoAP) are two protocols supporting publish/subscribe models for IoT devices to publish messages to interested subscribers. Retransmission mechanisms are introduced to compensate for the lack of data reliability. If the device does not receive the acknowledgement (ACK) before retransmission timeout (RTO) expires, the device will retransmit data. Setting an appropriate RTO is important because the delay may be large or retransmission may be too frequent when the RTO is inappropriate. We propose a Gateway-assisted CoAP (GaCoAP) to dynamically compute RTO for devices. Simulation models are proposed to investigate the performance of GaCoAP compared with four other methods. The experiment results show that GaCoAP is more suitable for IoT devices.
Highlights
The Internet of Things (IoT) is a network linking physical objects that generally have embedded sensors/actuators (SA) to sense events and interact with the environment
We describe the simulation flow chart for IoT devices in Gateway-assisted CoAP (GaCoAP)
We proposed a gateway-assisted method for IoT devices to determine the retransmission timeout (RTO)
Summary
The Internet of Things (IoT) is a network linking physical objects that generally have embedded sensors/actuators (SA) to sense events and interact with the environment. Those physical objects usually called devices communicate with each other with limited human interaction. When the devices detect some event happening, they generate data and send it to relative receivers. The implantable medical devices are introduced to collect patients’ data (e.g., blood pressure or body temperature) [1]. Once the devices sense the change of patients’ status, the devices notify relevant medical units immediately. There are two major messaging patterns: request/response and publish/subscribe
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