BLE fixes 2020-2
Just some minor changes to more rigidly define the pairing requirements and behaviour. A secure implementation still needs https://git.card10.badge.events.ccc.de/card10/firmware/-/issues/74
Just some minor changes to more rigidly define the pairing requirements and behaviour. A secure implementation still needs https://git.card10.badge.events.ccc.de/card10/firmware/-/issues/74