https://devzone.nordicsemi.com/f/nordic-q-a/48127/questions-about-adding-characteristics-soft-device-s132-5-00-sdk-14-2-0-nrf52832I&#39;m trying to realize the behavior of &quot;BLE peripheral&quot; that implements 20 &quot;characteristics&quot;. While I was in the process of implementation, when I added 18 pieces, the return value of &quot;sd_ble_gatts_characteristic_add ()&quot; got an error. When I investigateden-USTelligent Community 13Tue, 04 Jun 2019 08:11:45 GMThttps://devzone.nordicsemi.com/thread/190677?ContentTypeID=1Tue, 04 Jun 2019 08:11:45 GMT137ad170-7792-4731-bb38-c0d22fbe4515:7ba22410-6430-4870-aaad-e057eb66bbe2Japanese Beginner<div class="result-shield-container tlid-copy-target"><span class="tlid-translation translation" lang="en"><span title="">The problem is solved.</span> <span title=""> Thank you very much.</span></span><span class="tlid-translation-gender-indicator translation-gender-indicator"></span><span class="tlid-trans-verified-button trans-verified-button" style="display:none;"></span></div><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/190672?ContentTypeID=1Tue, 04 Jun 2019 07:56:31 GMT137ad170-7792-4731-bb38-c0d22fbe4515:57511258-6ec2-4b0f-8db4-b0e1787671eaAndy<p>You&#39;re almost correct.</p> [quote userid="80285" url="~/f/nordic-q-a/48127/questions-about-adding-characteristics-soft-device-s132-5-00-sdk-14-2-0-nrf52832"]&nbsp; By changing “NRF_SDH_BLE_GATTS_ATTR_TAB_SIZE” to fit within the range, it is possible to change the RAM size that can be used to add the characteristic without affecting other operations.[/quote] <p>You have to change&nbsp;<span>NRF_SDH_BLE_GATTS_ATTR_TAB_SIZE first, then you compile, flash and run and you should get some logs saying that the RAM regions should be changed to 0xXXXXXXXX. Then you go to your linker file (or memory placement or whatever), and you make the changes as they appear in the log. That should solve your problems.</span></p><div style="clear:both;"></div>