Hands-On Embedded Programming with C++17

Using the system

We can use the measured values and store them in a database by subscribing to the nsa/plant/moisture_raw topic. The trigger point can be adjusted by sending a new command to the plant/<location string> topic.

The web server on the device can be accessed by taking the IP address, which we can find either by looking at the output on the serial console, as described in the previous section, or by looking at the active IP addresses in your router.

By opening this IP address in the browser, we should see the HTML template filled in with the current values.