I’ve been using Volumio for some time at home (running on RPi), and have been thinking about installing one in my car, permanently. The main problem is - connectivity.
Having an android phone, I would have liked to use it to control Volumio (either from the web interface or from some MPD app). This can obviously be achieved by using ad-hoc wifi on the RPi, but that would mean that the phone would be connected to the car’s wifi and not to mobile data - which I must have (Waze, whatsapp, etc). I also looked at the option of running the android as a hot-spot (despite the enormous, and not very necessary, load on the battery), but it seems that in this mode the phone itself is only able to use the WAN, thus unable to communicate with the RPi (on the LAN). I even considered installing a mobile router in the car (e.g. the TP-link WR702N), but that would require an additional data-enabled SIM, which my operator does not provide. As far as I can tell, this rules out all wifi related options.
Bluetooth would be my next thought. The phone can connect to several devices simultaneously (RPi and the car’s hands-free speaker), and the small bandwidth is surely enough for MPD control. The only problem ? there are actually two - both Volumio & the controller app need to support BT…
Any other ideas ? What have I missed ? And more importantly - are there any plans for adding BT support ?