Yes; does it persist (need to save)? Or; just a a one shot? (setting it sends whatever HA needs for discovery once)?
Do I have to clear out old names? Restart HA?
SetOption19 1 five minutes ago. No change.
Had to set: both Topic and FriendlyName to desired name, then SetOption19 1.
After that, assigned names appeared in HA overview
Safe to say any tasmota config change requires SetOption19 1 after?