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Which IoT protocol should you use for your design?

Rudy Ramos, Mouser Electronics, Nov. 03, 2016 – 

One thing is for certain when it comes to designing an IoT (Internet of Things) device; it won't be standalone. Unlike the way most traditional embedded devices have been developed in the past, such as the old-style digital thermostat I have in my hallway, IoT devices will always feature some form of communication. In the majority of cases, this will be wireless-based, and the key determining factors in the selection of the way it will communicate will be the required range, the amount of data to be transferred, and the available power budget.

Thus, embedded developers will now find themselves needing to delve into the world of communication protocols, standards, and wireless specifications. Understanding wireless design is a specialist subject in itself; thankfully, the availability of a range of pre-certified, type-approved wireless modules greatly simplifies the task.

The first step in determining which protocol to use for your IoT device is to take a step back and review the OSI 7-layer model. Getting the terminology right and using this model as a way of understanding which protocol method fits where can help. Appreciating the role of the different layers (e.g., physical, transport, network) and their correlation to the task at hand (e.g., communications, data exchange, device management) helps to put everything into context.

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