There is a node.js wrapper for bluetoothctl - https://www.npmjs.com/package/bluetoothctl
So if you are using node.js on your pi, you can do some magic with it and run what you want on bluetooth device connect.

but it is unlistenable if you are using an Android phone I`m using desktop and it`s all fine with playing music from my android phone, no difference from pc - oxygen 4.1 Just to clarify - what's your PI setup? Are you using a Bluetooth USB device or an onboard one? Pi 3 model B, onboard bluetooth, ...

but it is unlistenable if you are using an Android phone

I`m using desktop and it`s all fine with playing music from my android phone, no difference from pc - oxygen 4.1

Hi, guys. I've installed raspbian stretch and have succesfully connected my phone, laptop with pi by bluetooth. Also i've translated sound from this devices to pi by using the bluealsa-aplay xx:xx:xx... & And all is working fine, but i have to run aplay on every connect/disconnect. And here goes the...