https://devzone.nordicsemi.com/f/nordic-q-a/325/heart-rate-example-changes-update-rateI am using the heart rate example to do a quick demo. I am sending a short string of data one byte at a time to the iphone. I decreased the HEART_RATE_MEAS_INTERVAL interval dramatically from 1000 to 150 to get the data across quickly. What I have noticeden-USTelligent Community 13Fri, 24 Apr 2015 07:08:58 GMThttps://devzone.nordicsemi.com/thread/1723?ContentTypeID=1Fri, 24 Apr 2015 07:08:58 GMT137ad170-7792-4731-bb38-c0d22fbe4515:750045a6-cc84-4680-9d37-6eb8db7ac3efaileen<p>I have this issue also, and solved it just now. I modified both MIN_CONN_INTERVAL and MAX_CONN_INTERVAL values to match the interval of sending packets. In my design, the MIN is 50ms, by the way.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/1722?ContentTypeID=1Thu, 22 Aug 2013 07:24:15 GMT137ad170-7792-4731-bb38-c0d22fbe4515:942f18ee-770d-454b-a1cb-12d122046bd1Ole Morten<p>This most likely happens since the connection parameters are updated after some time. By default, the ble_app_hrs will send a connection parameter update 5 seconds after the CCCDs have been written. Take a look at the ble_conn_params module, and the FIRST_CONN_PARAMS_UPDATE_DELAY define in the top of main.</p> <p>For an explanation of connection parameters, take a look at <a href="https://devzone.nordicsemi.com/index.php/what-is-connection-parameters">this question</a>.</p><div style="clear:both;"></div>