It works about 20% of the time, usually when both slave ( nexus 6p root) and master ( s10+) are rebooted and setup, it'll work, but after exiting the vehicle and reentering a while later, it won't start.
The slave keeps asking to set the app as default, which i keep doing but it doesn't seem to stay, or realize it's default. So I have to keep re-set it as default. this happens almost every time.
The master doesn't seem to start or quit tethering all the time. Starting usually works, but disconnecting/stopping is a lot more trouble.
Any Ideas on where to start troubleshooting?