I'm doing a Lego EV3 robot for a project. It needs to play sounds (like a soundboard app on a phone, but triggered remotely). Sadly, the speaker on the EV3 brick is too quiet for this.
I got the idea to use my old phone connected to a Bluetooth speaker. I want to hold my phone in my hand and with that phone, I want to make my other phone play short MP3 files. Without any wired connection. Sadly, I can't find any apps that already do this and I have no programming experience.
Is there another way to remotely trigger playback of a sound file stored on the phone? I'm okay with rooting the phone.