https://devzone.nordicsemi.com/f/nordic-q-a/19892/ble-throughput-with-ios-connection-parametersHello Nordic Team, After setting connection parameters in accordance with Apple BLE design guidelines the BLE throughput has been significantly decreased. My parameters are as following: Interval Max * (Slave Latency + 1) ≤ 2 seconds ==&gt; 40msen-USTelligent Community 13Thu, 23 Feb 2017 09:27:52 GMThttps://devzone.nordicsemi.com/thread/77419?ContentTypeID=1Thu, 23 Feb 2017 09:27:52 GMT137ad170-7792-4731-bb38-c0d22fbe4515:75786cc4-51da-46c3-904b-a0b0985a2ba6run_ar<p>Since you are using the nRF51 <a href="https://devzone.nordicsemi.com/question/3440/how-do-i-calculate-throughput-for-a-ble-link/">this post</a> will explain how his works. (for newer chips/stack combination DLE and 2Mbit could be used to increase the throughput). Note that it is possible to get faster intervals with iOS if you don&#39;t follow the guidelines. e.g. min 12.5 and max 22.5 might work. I would also recommend that you use another softdevice e.g. 130 v2 which is capable of sending up to 6 packets per interval.</p><div style="clear:both;"></div>