An enhanced version of StandardFirmata version 2.5.8
FirmataExpress utilizes a serial baudrate of 115200. In addition it adds support for Tone, DHT humidity/temperature sensors, stepper motors, HC-SR-04 distance sensor, advanced auto-discovery of connected Arduino boards, and a watchdog timer.
This library is compatible with all architectures so you should be able to use it on all the Arduino boards.
To use this library, open the Library Manager in the Arduino IDE and install it from there.