We are still working on Trigger ! There will be an update soon. Lollipop + mobile data users and Mobile Hotspot are * not * work. Google has made breaking changes in Lollipop + and those will not work , even with root access. We are looking at that time.
In your car: use Bluetooth as a trigger to open the GPS and launch your favorite music application
+ Change the volume or sound notifications.
+ Consult social media like Foursquare or Google Places
+ Send messages using Twitter , SMS , e + mail or Glympse
+ Set alarms or create calendar events
For More Info Google Play