lcalamar
It appears a person in this forum tried to do the same thing but discovered "tasker" and "ifttt" both require google services. They were recommended "easer" and 2 users verified that it doesn't work.
I just tried "automation" by Jens Schroder on f-droid and it seems to have the exact functionality im describing, even with the option to set a radius, but unfortunately it says it requires the device to be rooted for that functionality.