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Mastering Internet of Things by Peter Waher

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The benefits of application-layer standards

Although we have used standards in earlier chapters, these have been Transport-layer (TCP, UDP), Session-layer (MQTT), and Presentation-layer (HTTP, CoAP) standards, as displayed in Figure 1. Here, we've used the Open Systems Interconnection (OSI) model, as a good way to illustrate communication between applications in a network. The standards on different levels facilitate development and deployment. But we have had to add the remaining application-layer to our code, in a proprietary fashion. If we manage to use standardized technologies in the application layer as well, we can say that our application becomes interoperable. Devices from different manufacturers can interact, in a standardized manner, ...

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