https://devzone.nordicsemi.com/f/nordic-q-a/125745/challenges-connecting-to-11-peripherals-to-one-centralSummary We are developing a Central application on the nRF7002 DK (nRF5340 SoC) using NCS v2.7.0 . The goal is to establish and maintain 11 concurrent Bluetooth Low Energy (BLE) connections to collect sensor notification data from Peripheral devicesen-USTelligent Community 13Mon, 24 Nov 2025 09:15:37 GMThttps://devzone.nordicsemi.com/thread/555160?ContentTypeID=1Mon, 24 Nov 2025 09:15:37 GMT137ad170-7792-4731-bb38-c0d22fbe4515:8bb62d4b-e1ac-4c01-a043-9fa1a494e539Simonr<p>Hi</p> <p>The error code you&#39;re seeing (-120) points to the operation already being in progress. It seems your previous GATT MTU exchange is still ongoing when you&#39;re trying to do the next one, so you need to make sure the previous one is completed before you connect to and have a MTU exchange with another device.</p> <p>The nRF5340 should have enough memory to hold&nbsp;<strong>at least</strong> 11 connections, but the project configuration files might not be set to support that many connections. In general, I think the easiest would be to move/upgrade to NCS v2.8.0 and use the scanning_while_connecting sample as reference, but it should be possible on v2.7.0 as well. You can use the prj.<strong>conf</strong> file from the scanning_while_connecting sample for reference.</p> <p>Best regards,</p> <p>Simon</p><div style="clear:both;"></div>