https://devzone.nordicsemi.com/f/nordic-q-a/59125/nrf51HI,ALL！ I use official routine development NRF51822，nRF51\nRF5_SDK_12.3.0_d7731ad\nRF5_SDK_12.3.0_d7731ad\examples\ble_central\experimental\ble_app_blinky_c\pca10028\s130\arm5_no_packs I&#39;m going to increase the number of reception：from（#define CENTRAL_LINK_COUNTen-USTelligent Community 13Mon, 16 Mar 2020 13:25:05 GMThttps://devzone.nordicsemi.com/thread/240024?ContentTypeID=1Mon, 16 Mar 2020 13:25:05 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3af61592-c343-4b88-8d4a-61801b605583Amanda Hsieh<p>Hi,&nbsp;</p> <p>This <a href="https://devzone.nordicsemi.com/f/nordic-q-a/25095/s130-v2-0-1-rom-and-ram-setting/132073#132073">post </a>might help you.&nbsp;</p> <p>You also could enable the log in the sdk_config.h and the output log will indicate the correct ram value.&nbsp;</p> <p>-Amanda H</p><div style="clear:both;"></div>