https://devzone.nordicsemi.com/f/nordic-q-a/18503/bandwidth-configuration-how-to-achieve-different-bandwidthsHi I&#39;m trying to get higher throughput when connected as a central by increasing my Tx&amp;Rx bandwidth to high (from the default medium). uint32_t nrfErr; ble_opt_t opt = {0}; /* Set the role as central */ opt.common_opt.conn_bw.role = 2; /* Seten-USTelligent Community 13Tue, 20 Dec 2016 12:35:49 GMThttps://devzone.nordicsemi.com/thread/71402?ContentTypeID=1Tue, 20 Dec 2016 12:35:49 GMT137ad170-7792-4731-bb38-c0d22fbe4515:5cf72ff3-0076-4a78-9576-a5a6af1644efPetter Myhre<p>If you set enable_params.common_enable_params.p_conn_bw_counts to NULL you tell the SoftDevice to reserve RAM for default bandwidth configuration for your connections. Connections as a Central will be set to medium bandwidth and connections as a Peripheral will be set to high bandwidth. See <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.s132.sds/dita/softdevices/s130/ble_protocol_stack/role_configuration.html?cp=2_3_0_0_9_3">this</a> for more information.</p> <p>So if you want to use BLE_CONN_BW_HIGH with a connection as a central you need to set enable_params.common_enable_params.p_conn_bw_counts something that reflects this.</p><div style="clear:both;"></div>