TX signal strength for an Script on an CPE

Hello,

i need for a script the current TX-Signal-Strength aof the CPE Antenna (the signal, it cames in in AP).
With the script i will set tx-power automatically every 24 hours on the CPE (so it will be not to many on the AP).

Has anyone a script or siple the cli-command for become only this value? In Registration-Table only rx-strength…

best regrads
Christian