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How does the IOS app or Android app realtime refresh the RSSI value?

Once connected to the peer, the app will begin with "sd_ble_gap_rssi_start()", and the peer will send RSSI sample to the softdevice, and the SD will back to APP with a "BLE_GAP_EVT_RSSI_CHANGED" . Is this the right procedure to refresh the RSSI value ? If so ,what is the frequency of RSSI sample transmition?

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