The newest update for ESP boards (2.6.3) requires ArduinoJSON library that's needed to parse the data coming from the Duino-Coin /getPool API to automatically connect to the least loaded node.

If you do not have the ArduinoJSON library installed, you will get an error during compilation.

To install it, we recommend using the Arduino library manager:

Open your Arduino IDE > Sketch > Attach libraries > Manage libraries > Type ArduinoJson and install the newest version (6.18.13).

After doing this you should have no problems related to JSON with compiling the code.

Alternatively you can install the library manually (won't auto-update):

Download the https://github.com/bblanchon/ArduinoJson library and unzip in your Arduino libraries folder (see https://www.arduino.cc/reference/en/libraries/)

(written by @joaquinbvw on the Duinocoin Discord, corrected by @revoxhere)