https://devzone.nordicsemi.com/f/nordic-q-a/125932/s113-softdevice-mtu-limit-on-nrf52833Question: What&#39;s the maximum NRF_SDH_BLE_GATT_MAX_MTU_SIZE supported by S113 v7.2.0 on nRF52833? Current setup: Chip: nRF52833 SoftDevice: S113 v7.2.0 Max working MTU: 247 bytes Can we set MTU larger than 247? If not, whaten-USTelligent Community 13Wed, 10 Dec 2025 13:12:38 GMThttps://devzone.nordicsemi.com/thread/556684?ContentTypeID=1Wed, 10 Dec 2025 13:12:38 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ec818e3c-91f1-4812-9d3c-8dfdcc84703bSigurd<p>Hi!</p> <p>You should be able to set it to 512, but you might need to allocate more RAM to the SoftDevice for it to work.&nbsp;<span>See e.g. this page:&nbsp;&nbsp;</span><a href="https://devzone.nordicsemi.com/guides/short-range-guides/b/getting-started/posts/adjustment-of-ram-and-flash-memory">Adjustment of RAM and Flash memory</a></p> <p>From the Bluetooth spec:</p> <p>From&nbsp;BLUETOOTH CORE SPECIFICATION Version 5.2 | Vol 3, Part F page 1485:</p> <p><em>&quot;The maximum length of an attribute value shall be 512 octets.&quot;<br /><br /></em></p> <p>&nbsp;PS:&nbsp;If this is a new project, I strongly recommend using nRF Connect SDK instead:&nbsp;<a href="https://www.nordicsemi.com/Products/Development-software/nrf-connect-sdk">https://www.nordicsemi.com/Products/Development-software/nrf-connect-sdk</a></p><div style="clear:both;"></div>