https://devzone.nordicsemi.com/f/nordic-q-a/27705/why-mtu-over-147-bytes-prevents-connection-with-iphone-7Hi We are developing ble peripheral application for the nrf52832 using SDK v13.0.0. and everything was working correctly until we tried ble connection with the iphone 7 with ios 11.1.2. iPhone 6 with the same ios version was working correctly. Ien-USTelligent Community 13Wed, 29 Nov 2017 14:20:17 GMThttps://devzone.nordicsemi.com/thread/109361?ContentTypeID=1Wed, 29 Nov 2017 14:20:17 GMT137ad170-7792-4731-bb38-c0d22fbe4515:bf1fdc38-4245-442a-b4fc-12e9db26f57brolandash<p>I had similar issue but different results. See this link:</p> <p><a href="https://devzone.nordicsemi.com/question/177092/why-can-not-set-max_mtu_size-to-247/">devzone.nordicsemi.com/.../</a></p> <p>If possible can you try to capture a sniffer trace? That will explain everything.</p><div style="clear:both;"></div>