From my understanding, ZE0 had no way of setting a set point for cabin temperature when using climate control. That's why:
v.e.cabinsetpoint
is a read only metric and not writeable. The creator of the Nissan specific framework (xnl) knew that this option was not needed for ZE0.
But the Nissan Connect app for ZE1 had this option, so I guess that if someone have the skills to update the xnl to support writing to "cabinsetpoint", maybe this function might work?
I am not aware any limitations by the OVMS module or the way the CAN or TCU on ZE1 is set up that is preventing this to work. I'm quite new to OVMS, so I was hoping to catch the eyes of someone who had more thoughts/skills on this than me.
EDIT: Seems like a way forward would be to use SavvyCAN to log all CAN data while adjusting the climate control. That way we would know the ID and the 8 byte data associated with each temperature set point. I bought a cheap OBDII adapter which I didn't get to work. So if somebody could be tasked with logging this data, there might be progress :)