I can sell you a RF solution, codes…
XIAO to XIAO communication Only., less than 10ft.
500mAH should last you more than 12 hours with my-setup, I have tested similar configurations/On the transmitter XIAO/On-my Codeset.
On the receiver XIAO, it all depends on the Actual LOAD.
NO BLE, NO Bluetooth, NO WIFI Dependency,
Code-set that i have is for commercial purpose only for my own use, took me a long time to develop /worked with developer for a different purpose…
Good Luck on your endeavor,
if u cant find a solution, pls consider pinging me… with a spec.
thx
Outkasst…