Testbeds are a key tool for evaluating and benchmarking IoT solutions. Several public testbeds are being run by institutions around the world. These are built with a variety of tools, and are typically "heavy" installations with dedicated wiring, hard installations, switches, servers, and a reservation and experiment management back-end. To complement those, we have taken the opposite, minimalistic, approach in designing the OpenTestBed. The OpenTestBed features all the tools necessary to build a testbed from off-the-shelf components such as Raspberry Pi single-board computers, OpenMote B low-power wireless devices, and glass domes. Each TestBox in the testbed connects to an MQTT broker over WiFi, no dedicated wiring or back-end is needed. The Inria-Paris OpenTestBed testbed of 80 motes has cost only 9,480 euros, and is open-access. The OpenTestBed is a fully open-source and open-hardware project, which several institutions have already adopted.
Many Industrial IoT TSCH networks, such as SmartMesh IP, operate in the same 2.4 GHz frequency band as WiFi. As the smart factory becomes more and more connected, WiFi starts being rolled out on many factory floors. It is hence completely legitimate to question whether WiFi impacts Industrial IoT TSCH networks, and in particular their endto-end reliability. In a setup which replicates a worst case industrial setting, we conduct a thorough experimental study which looks at the performance of a 47-mote SmartMesh IP network undergoing several levels of WiFi interference. The result is that, even though the latency and power consumption of the network increase, end-to-end reliability stays at 100% even under very high WiFi interference. The conclusion is that TSCH technology at 2.4 GHz, such as SmartMesh IP, is perfectly appropriate to for an industrial environment where WiFi is heavily used. This paper is complemented by a research report which contains all the information needed to replicate the measurements, and the raw data.
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