https://devzone.nordicsemi.com/f/nordic-q-a/5238/can-the-connection-parameters-be-updated-by-the-central-during-a-connectionI&#39;m trying to understand latency between simple events (like a button press) and transmissions to show that event on the nRF Toolbox iOS app. In some trials, my updates are nearly instant. In other trials, with the same firmware, it can take ~3-5s toen-USTelligent Community 13Fri, 23 Jan 2015 14:52:18 GMThttps://devzone.nordicsemi.com/thread/18353?ContentTypeID=1Fri, 23 Jan 2015 14:52:18 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1c2b88a8-3378-4498-b5f6-64c0013c686bStefan Birnir Sverrisson<p>Hi</p> <p>For info on how the connection parameter update request procedure works, look at <a href="https://devzone.nordicsemi.com/question/12545/update-connection-parameter-programmatically/">this thread</a>.</p> <p>To see what the actual connection interval is, look at <a href="https://devzone.nordicsemi.com/question/23190/whats-the-actual-connection-interval-used/?answer=23294#post-id-23294">this thread</a>.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/18352?ContentTypeID=1Wed, 21 Jan 2015 19:45:53 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e423ac81-6212-4fbe-8886-0434da4182f2Clem Taylor<p>The central controls the connection interval and can change it without the device requesting a change. I modified the python ble_dfu_send_hex tool to do this. Initially the connection interval &gt;100ms (otherwise the erase takes forever) and then once it is ready to send the data it drops it down to 7.5ms for the fastest transfer. I wanted to do this on the device side, but the ble_dfu_send_hex script was ignoring gap_conn_param_update message.</p><div style="clear:both;"></div>