Do you know power on method from power off state via commands or API

Camera Hardware and Software
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In the discussion below, there are also two ways to wake the THETA V from sleep with the USB API.

RICOH THETA API Over USB Cable - (Z1, V, S, SC models) - #116 by Hugues

These two techniques work with the THETA V firmware 3.70.1.

If this is for a one-time project, try looking for a used THETA V on eBay or equivalent.

If this is for a potential high-volume project, contact @jcasman for further discussion.

For a one-time project, you should be able to find a THETA V for less than USD $300 used.