I would like to know if I can send with the metadata not only the song that its on air but also the 2-3 next songs that we are going to play in the Radioboss player.
Its very important for us because we want to use it like a feature in a mobile app.
Currently this is not really possible because RadioBOSS only evaluates the next track, and does not go further. Also even if it did, while track is playing, a scheduled event could start and change the playlist.
If you still need it, you can implement it using the API. It allows retrieving the playlist contents, the current track number and other information. If you don't use shuffle playback, and you don't have a lot of scheduled events that change the playlist, you can show any number of the upcoming tracks: https://manual.djsoft.net/radioboss/en/remote_controlapi.htm