https://devzone.nordicsemi.com/f/nordic-q-a/17905/nrf51-how-to-change-the-ble-connection-parametersI am testing to develop an application that sleep (system-on mode) for most of the time, and it wake-up periodically to send out somethings. As I would like to lower the power consumption as much as possible, I want to change the &quot;connection intervalen-USTelligent Community 13Tue, 22 Nov 2016 10:29:51 GMThttps://devzone.nordicsemi.com/thread/69042?ContentTypeID=1Tue, 22 Nov 2016 10:29:51 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a9fb0633-f88f-4575-9de8-d9b18b6f3f17Sigurd<p>The connection parameters used are defined in <code>main.c</code>. For the ble_app_uart example in SDK 12.1, you can find the parameters on line 61 to 67:</p> <pre><code>#define MIN_CONN_INTERVAL MSEC_TO_UNITS(20, UNIT_1_25_MS) /**&lt; Minimum acceptable connection interval (20 ms), Connection interval uses 1.25 ms units. */ #define MAX_CONN_INTERVAL MSEC_TO_UNITS(75, UNIT_1_25_MS) /**&lt; Maximum acceptable connection interval (75 ms), Connection interval uses 1.25 ms units. */ #define SLAVE_LATENCY 0 /**&lt; Slave latency. */ #define CONN_SUP_TIMEOUT MSEC_TO_UNITS(4000, UNIT_10_MS) /**&lt; Connection supervisory timeout (4 seconds), Supervision Timeout uses 10 ms units. */ #define FIRST_CONN_PARAMS_UPDATE_DELAY APP_TIMER_TICKS(5000, APP_TIMER_PRESCALER) /**&lt; Time from initiating event (connect or start of notification) to first time sd_ble_gap_conn_param_update is called (5 seconds). */ #define NEXT_CONN_PARAMS_UPDATE_DELAY APP_TIMER_TICKS(30000, APP_TIMER_PRESCALER) /**&lt; Time between each call to sd_ble_gap_conn_param_update after the first call (30 seconds). */ #define MAX_CONN_PARAMS_UPDATE_COUNT 3 /**&lt; Number of attempts before giving up the connection parameter negotiation. */ </code></pre><div style="clear:both;"></div>