I developed the project based on ble_app_uart sample in SDK10.0.0（nrf51822）,
Now I need to make factory production tools for the machine.The tool now
needs the ability to write an SN number.The tool should have the ability
to expand, later can support the export of SN number from the database
to carry out the brush operation.I don't know what to do now, please
provide a very detailed and feasible development plan.I look forward to your reply.
