Add _fields list and get_step_fields/values.
Add _fields list and get_step_fields/values.

wheeler-microfluidics/dmf_control_board_plugin,wheeler-microfluidics/dmf-control-board-firmware,wheeler-microfluidics/dmf-control-board-firmware,wheeler-microfluidics/dmf-control-board-firmware,wheeler-microfluidics/dmf-control-board-firmware