https://devzone.nordicsemi.com/f/nordic-q-a/126209/ble-advertising-channel-configuration-for-certificationOur custom product, based on the nRF52832, is undergoing certification. The testing laboratory requires that only one BLE advertising channel be active at a time—first channel 37, then channel 39. I have attempted to configure this in our firmware,en-USTelligent Community 13Thu, 18 Dec 2025 13:26:18 GMThttps://devzone.nordicsemi.com/thread/557332?ContentTypeID=1Thu, 18 Dec 2025 13:26:18 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6f75e193-e516-4644-8cbf-ac273d279496Susheel Nuguru<p>Which SDK are you using? nRF5SDK or nRF Connect SDK.</p> <p>on nRf5SDK it is quite simple, you use the channel_mask member for that</p> <p><pre class="ui-code" data-mode="text">static ble_gap_adv_params_t adv_params = { .properties = BLE_GAP_ADV_PROPERTIES_TYPE_NONCONNECTABLE_NONSCANNABLE, .interval = MSEC_TO_UNITS(100, UNIT_0_625_MS), .channel_mask = { .ch_37_off = 0, .ch_38_off = 1, .ch_39_off = 1 }, /* only ch37 */ }; sd_ble_gap_adv_set_configure(&amp;adv_handle, &amp;adv_data, &amp;adv_params); sd_ble_gap_adv_start(adv_handle, APP_BLE_CONN_CFG_TAG);</pre></p> <p>But If you are using nRf Connect SDK, then I need to dig a bit more about it, I think you need to HCI command API to set the channel mask .</p><div style="clear:both;"></div>