Some script to remotely control Yamaha amps
yamCustVol($ip,$vol)
yamCustVolZ2($ip,$vol)
yamStartMain($ip)
yamStartZ2_NetRadio($ip)
yamStartZ2_Sel1($ip)
yamStartZ2_Sel2($ip)
yamStart_Sel1($ip)
yamStop($ip)
yamStopZ2($ip)
yamVolDownZ2($ip)
yamVolUpZ2($ip)
yamZ2Mute($ip)
yamZ2_45($ip)
More details here : https://www.lets-talk-about.tech/2021/01/yamaha-remotely-controlled-amplifiers.html