RE: Nordic SDK Central and peripheral Uart Service

awneil — Tue, 23 Jul 2019 07:57:46 GMT

SDK v15.3.0

Central - in ble_nus_c.h:

/**@brief Function for sending a string to the server.
 *
 * @details This function writes the RX characteristic of the server.
 *
 * @param[in] p_ble_nus_c Pointer to the NUS client structure.
 * @param[in] p_string    String to be sent.
 * @param[in] length      Length of the string.
 *
 * @retval NRF_SUCCESS If the string was sent successfully. Otherwise, an error code is returned.
 */
uint32_t ble_nus_c_string_send(ble_nus_c_t * p_ble_nus_c, uint8_t * p_string, uint16_t length);

don't be put off by the "string" in the name; that's misleading - it actually just sends any arbitrary data.

https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.3.0/ble_sdk_app_nus_c.html

Peripheral - in ble_nus.h:

/**@brief   Function for sending a data to the peer.
 *
 * @details This function sends the input string as an RX characteristic notification to the
 *          peer.
 *
 * @param[in]     p_nus       Pointer to the Nordic UART Service structure.
 * @param[in]     p_data      String to be sent.
 * @param[in,out] p_length    Pointer Length of the string. Amount of sent bytes.
 * @param[in]     conn_handle Connection Handle of the destination client.
 *
 * @retval NRF_SUCCESS If the string was sent successfully. Otherwise, an error code is returned.
 */
uint32_t ble_nus_data_send(ble_nus_t * p_nus,
                           uint8_t   * p_data,
                           uint16_t  * p_length,
                           uint16_t    conn_handle);

https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.3.0/ble_sdk_app_nus_eval.html