Cannot control playback on KMM-BT315U bluetooth

[namrood]

I used to have google play before I switch to spotify, and I am used to control the playback from the vehicle controls or the KENWOOD KMM-BT315U which is connected to my android over bluetooth.

With spotify I cannot go to next track or previous track. Neither from the car controls nor from the KMM-BT315U media receiver. I have to use my android phone to do this, which is so dangerous, risky and illegal as well (You get ticket for that).

Anyone has a solution for this problem? Why spotify cannot do this while other media players can do? This is a basic functionality!