So, if I understand correctly, my hardware, which is connected through an I2C interface can be added as a smbus device.

If the sensor hardware connects through a Pi Pico and is connected through a serial interface, how is the Pi Pico firmware defined, is it equivalent to Firmata? Many of the examples indicate use of a serial connection between an Uno and the Unihiker M10?

This is where there is little available clarity.

Regards.