We are back with the second part of our IoT development series. Please check out the first part for a brief description of the CoAP protocol and introduction to what we are trying to achieve.
Let us first summarize what we have done so far. First, we have implemented CoapNode - an Elixir app that mocks software that would be running on an embedded device like ESP8266. CoapNode is a CoAP server that exposes resources to the outside world. It can register its resources in CoapDirectory which is something we ultimately want to put on a Raspberry PI using Nerves. We have finished implementing the tools in the CoapDirectory to make requests to given nodes. But the directory itself does not expose any interface. And that is what we are going to do now. We will expose an HTTP API.
This is the flow we are going to achieve:
The whole idea is that any static IP that anyone needs to know is the IP of the CoapDirectory. At the end, we will also hook up a Phoenix application to the setup and allow a resource observation in the browser.
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The ‘Internet of Things’ or simply IoT; is evolving at a great pace to become one of the fastest-growing enterprises whole over the business world.