Why does FooSales lose its Bluetooth connection to my Star mPOP?

This is a known limitation of the Star mPOP SDK which causes mPOP devices to loose Bluetooth connection when you minimize the FooSales app (e.g. to process payment in another app) or when the device goes into sleep mode. If this happens you can open the Settings screen and tap the find printers button to rediscover the printer in order to have the app connect to it again.