https://devzone.nordicsemi.com/f/nordic-q-a/67515/how-to-periodically-read-peripheral-dataCan I periodically or continuously read the characteristic of peripheral after the connection? If there is a change in the value in peripheral, then the value is received in central. (Should &#39;BLE_GATTC_EVT_CHAR_VAL_BY_UUID_READ_RSP&#39; be used?) (Centralen-USTelligent Community 13Thu, 22 Oct 2020 09:33:16 GMThttps://devzone.nordicsemi.com/thread/276392?ContentTypeID=1Thu, 22 Oct 2020 09:33:16 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6dfa58ad-8522-455b-afa1-53c77b4758e1Edvin<p>Hello,</p> <p>That really depends on the peripheral, but if it is your own peripheral, I suggest you look into notifications. Our central example ble_app_uart_c is intended to work with the peripheral example ble_app_uart, which uses notifications.&nbsp;</p> <p>There are several ways to send/receive data in BLE. One possibility is that the central reads the characteristic. There are a few different approaches to this (with and without authentication), but if you want the central to be notified whenever the peripheral changes the value of the characteristic, then notifications&nbsp;are definitely the way to go.&nbsp;</p> <p>Look at how the notifications are implemented in the ble_app_uart example. I don&#39;t know what your peripheral project device is. Is it an nRF? Did you write the code yourself?</p> <p>Notifications also needs to be enabled by the central. The ble_app_uart_c example does this in the discovery complete event. See how it uses&nbsp;ble_nus_c_tx_notif_enable() and how this is implemented.</p> <p></p> <p>Best regards,</p> <p>Edvin</p><div style="clear:both;"></div>