I've just upgraded to the paid version and frankly this is by far the best and most reliable solution to Android receipt printing I have tried. Thanks SD!
However I have a question about a notification I am getting on first start of the app after rebooting the device (POS terminal), which also stops the USB printer from working.
View attachment 142194
once I select and OK, subsequent running of the app does not ask again and the USB printer works fine until after the next boot.
I have checked the System Settings and cannot find anything relevant, same with permissions etc. in the sample app, which also displays the same behavior.
Cheers,
Kev