https://devzone.nordicsemi.com/f/nordic-q-a/114758/nrf-connect-sdk-issue-reading-ficrhello, I&#39;m using nrf52DK &amp; connect sdk v2.6.1. I&#39;m in the process of migrating from nrf5 SDK to connect SDK. My previous code to read Mac address to form unique BLE names works in nrf5 SDK but in connect SDK i have an issue. saying this &quot; implicit declarationen-USTelligent Community 13Tue, 17 Sep 2024 06:36:47 GMThttps://devzone.nordicsemi.com/thread/502682?ContentTypeID=1Tue, 17 Sep 2024 06:36:47 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a9d2ec53-905e-4c8f-b2a2-574e6ff4fab1Einar Thorsrud<p>Hi,</p> <p>You are getting a warning about the itoa function not being defined. This is non-standard and not included in the SDK or toolchain. If you need it, you need to implement it.</p><div style="clear:both;"></div>