How to start application automatically when bluetooth device is connected? Whenever I enter my car, bluetooth is connected. What I would like is my speedcam alert application to be started once BT is connected and ideally terminate application when disconnected. I am using LG G6 with Nougat.
For such automation purposes, you can use any one of the following-


IFTTT (if this happens then do this)
Automate 
Tasker (paid app)


Takser is somewhat difficult to use and paid app so I will recommend you to use IFTTT or Automate. 
IFTTT has supports for a variety of products such as Phillips Hue lights etc. But Automate is the easiest to use for your purpose.