ESP32 HTTP Get Set

A small, simple example to to create HTTP endpoints allowing you to get and set values on an ESP32/Arduino device.

I use an edited version of this to control the LED light strips in my room. With this, I don't need to have separate webpages for each of my ESP32 devices. Instead, I can control them from a single webpage that just runs its own HTTP GET/POST requests.

This is not a library, but an example to build off of.

Usage

1. Download and open the code
2. Install the prerequisite libraries specified at the top
3. Update the WIFI SSID and password
4. Configure the default values in configureJsonDocument. These will be the values at device turn-on. If you wish to restore the state from memory, this is where to do so.
5. Compile and run on your ESP32/Arduino device

Once running, two HTTP endpoints will be created.

• /get GET will return a JSON object of the current state of the current values
• /set?field=<field_name>&value=<value> POST will set the value of a field to the provided value

For example, my LED lights operate like so:

• GET request /get to check the status of the lights. If it's on, display an off switch, etc.
• POST /set?field=active&value=true to set the active flag to true when switch is toggled ON
• POST /set?field=active&value=false to set the active flag to false when switch is toggled OFF
• Once per second, the ESP32/Arduino polls (in the loop function) to update state of the lights (e.g. by powering on/off the pins to the relay).