Android not finding any devices during scan while phone location is turned off

[RaphaelLeivas]

I am posting this here in the hopes it may help someone, and perhaps suggest an improvent to the library.

In Android 10, the scan method will not find any devices if the phone location is turned off. No errors or warnings are thrown. After turning the phone location on again, the scan method works as expected.

It would be interesting to have a method enableLocation in the same way we currently have enableBluetooth, in order to prompt the user to manually turn the location on for the scan to work. Throwing an error message if the scan method is called while the phone location is turned off would also be very useful.

Perhaps it is a bit obvious that the phone location must be turned on given the multiple location permissions we have to request for the Bluetooth to work. Nevertheless I lost a significant amount of time trying to make the scan work on my Android 10 phone after it worked perfectly on another Android 11 phone - the only difference was that the phone location was turned off on my Android 10 device. This would not have happened if the library had support to enable the phone location.

Having this in the documentation (for example, in the troubleshooting page) could also avoid this situation happening with other users in the future.