# Implement configuration persistence ## Problem environment Many applications would benefit from persistent data storage, and the chosen MCU seems to support this. The Microchip LoRaWAN Stack (MLS) library implements *Persistent Data Server (PDS)* and provides a sample project. ## Steps to reproduce 1. Start Microchip Studio 1. Create a new ASF sample project 1. Choose a mote project with PDS ## Expected result The demonstrated persistence logic resembles the sendcomm implementation. ## Actual result No data persistence implementation exists. ## Workaround Try to use the battery backup on PB3 for persistence across restarts. ## Notice The [SAM R34 MLS Getting Started Guide](http://ww1.microchip.com/downloads/en/DeviceDoc/SAM-R34-MLS-Getting-Started-Guide-User-Guide-DS50002812A.pdf) explains how to use the NVM based PDF feature. ## Severity level This is **low priority** because project no requirement mandates persistence.

It seems that when a EVK is used with a EDBG MCU, that defining *EDBGEUIREAD* allows for the DevEUI to be persistently stored.