The ESP8266 can be used to retrieve data from online servers so long as it is connected to the Internet. To demonstrate how to do that, we will use our ESP8266 module to retrieve the most recent sensor data that was posted to dweet.io, in our previous recipe. This will give you an idea of how to go about retrieving data from online sources.
For this recipe, you will only need your ESP8266 board and a USB cable. You can also leave your setup as it was in the second recipe in this chapter, although we won't need to read sensor input this time round.
Reading the most recent data from dweet.io is just as simple as posting it. All you've got to do is send an http request using the following URL: https://dweet.io/get/latest/dweet/for/my-thing-name:
Replace
my-thing-namewith the name of your thing and you are good to go. Therefore, in our case, the URL we will use ishttps://dweet.io/get/latest/dweet/for/garden-monitor-11447.In addition to getting...