Simulate the push Button on music system using bluetooth on mobile

i want to simulate a push button using bluetooth from my phone on a music system
what i want to achieve by doing this is when we power on the music system(by using WiFi enabled Sockets), by default it starts in aux mode
by using mobile with bluetooth it changes it from aux to bluetooth mode so we can connect it with mobile and play music at scheduled time by using Tasker app

so we dont have to physically push any button