I listen to spotify while I wash the dishes - only thing that keeps me sane!
But, my hands are too soapy to control playback on my phone.
I was going to build a custom button board with volume control, skip AND ADD TO PLAYLIST.
I listen to random songs, and would like a way to tag songs for review.
I think the easiest will be to add them to a custom playlist.
I built a proof of concept using Node-RED on a Raspberry Pi, and discovered that volume control is handed off to the playback device (if it is a phone) and therefore cannot be included in my custom button board.
At this point, I bought a bluetooth button and can now control playback and volume since it simply pairs with my phone.
I really, really, really want the add to playlist functionality.
It seems like it has to be done via API, as there is no bluetooth shortcut for it.
The Spotify API: https://developer.spotify.com/console/post-playlist-tracks/
A candidate button: https://shop.espruino.com/puckjslite