March 2018
Beginner to intermediate
410 pages
10h 40m
English
Content preview from Mastering Internet of Things
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Introducing CoAP
There are several problems with using HTTP for resource-constrained devices. HTTP is verbose and requires a lot of bytes for headers. These headers are in plain text, and since HTTP has grown over time, there are a lot of headers that need to be supported to achieve compliance with the standards. This forces implementations to become large, which might be a problem if the device has limited memory. CoAP is much simpler and has less options, and therefore has a smaller code footprint than HTTP.
CoAP is an Internet Engineering Task Force (IETF) standard and is defined in RFC 7252: https://tools.ietf.org/html/rfc7252.
At the same time, the amount of data in the payload is often small. A sensor value can be encoded in just a ...
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