https://devzone.nordicsemi.com/f/nordic-q-a/16223/connection-parameter-isn-t-effect-with-iphone-5I set the connection as follows: #define MIN_CONNECTION_INTERVAL (uint16_t) MSEC_TO_UNITS(500, UNIT_1_25_MS) #define MAX_CONNECTION_INTERVAL (uint16_t) MSEC_TO_UNITS(1000, UNIT_1_25_MS) #define SLAVE_LATENCY 0 #define SUPERVISION_TIMEOUT (uint16_ten-USTelligent Community 13Thu, 08 Sep 2016 07:37:38 GMThttps://devzone.nordicsemi.com/thread/61965?ContentTypeID=1Thu, 08 Sep 2016 07:37:38 GMT137ad170-7792-4731-bb38-c0d22fbe4515:213e2b03-558f-4c71-ad3a-8a7d66254fbcPetter Myhre<p>If you are using examples with the connection parameter negotiation module included connection parameter update requests should be sent if the current connection parameters are undesired. Do you have a sniffer trace? Then we can see what the actual connection interval is, and if a connection parameter update request is actually sent.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/61963?ContentTypeID=1Wed, 07 Sep 2016 01:03:17 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9afda5fb-52c0-4d29-9f0e-445b14607501Ted<p>SDK11, Do you have example code? I think that SDK11 will send a connection parameter update, because the Android phone (Infocus M370) can change connection interval to 1 second. My platform is peripheral role. I traced the code. It&#39;ll call the function of on_conn_params_update when I connected nordic with Android phone. But It won&#39;t call the function of on_conn_params_update when I connected nordic with iPhone 5. Why?</p> <p><strong><em>Solve it. Thanks</em></strong></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/61964?ContentTypeID=1Tue, 06 Sep 2016 13:51:01 GMT137ad170-7792-4731-bb38-c0d22fbe4515:cb72815a-01ac-4bb8-8bea-90ddd21f515ePetter Myhre<p>What SDK are you using? What example? Are you sending a connection parameter update?</p><div style="clear:both;"></div>