The simplest and most standard way to interact with an IoT device is to provide a REST API. To do that, we need to include a web server in our things app and implement the handling of the requests. A simple library that helps us to achieve that easily is NanoHttpd. To include it we need to add the following dependency to our things module:
dependencies { [...] implementation 'org.nanohttpd:nanohttpd:2.2.0'}
The architecture we will use is quite simple. The activity will create a web server that will notify the requests received via an interface that represents the methods exposed on the API. In our case the interface is:
interface ApiListener { fun onGetTemperature(): JSONObject fun onPostLed(request: JSONObject) ...
