https://devzone.nordicsemi.com/f/nordic-q-a/98603/linker-error-undefined-reference-app_uart_put_bufferI am trying to compile code that compiled on older version of Segger studio. The code compiles but I get a linker error Undefined reference &#39;app_uart_put_buffer&#39; I also get this same message for several functions that don&#39;t seem to be defined in anyen-USTelligent Community 13Tue, 11 Apr 2023 12:35:58 GMThttps://devzone.nordicsemi.com/thread/419696?ContentTypeID=1Tue, 11 Apr 2023 12:35:58 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2ee85dc2-517d-4b2b-be6e-f95ad6aa37f1Einar Thorsrud<p>Hi,</p> <p>There are no&nbsp;app_uart_TX_Space_Count_Get etc in the SDK. Is this from your code?</p> <p>Regarding&nbsp;Segger Embedded Studio version I would recommend that you stick with the version that is mentioned in the release notes of the SDK you are using, as that is what was used for release testing. There are several issues with newer Segger Embedded Studio versions, and more will likely come with newer SES versions.</p><div style="clear:both;"></div>