Hello,
I am trying to established a Bluetooth communication between nrf52840dk and Fanstel BLG840F. nrf52840dk acts as peripheral device and Fanstel BLG840F acts as central device.
For peripheral device, I am using ble_peripheral -> ble_app_uart example from nRF5_SDK_17.
For central device, I am using bluetooth -> central_uart example from nRF SDK Connect.
I am sending some dummy data from peripheral to central. But, I am stuck on pairing which is constantly failing if I use security. I get below error.
And if I remove the below security, the I can see the peripheral device led stops blinking. And, on central side terminal window, I can verify it getting disconnected but, I didn't receive any data on central side. I am guessing this is because ble_data_received() is not getting executed (as I have given a print statement which is not printed on the central terminal).
err = bt_conn_set_security(conn, BT_SECURITY_L1); if (err) { LOG_WRN("Failed to set security: %d", err); gatt_discover(conn); }
The code for central device:
/* * Copyright (c) 2018 Nordic Semiconductor ASA * * SPDX-License-Identifier: LicenseRef-Nordic-5-Clause */ /** @file * @brief Nordic UART Service Client sample */ #include <errno.h> #include <zephyr/kernel.h> #include <zephyr/device.h> #include <zephyr/devicetree.h> #include <zephyr/sys/byteorder.h> #include <zephyr/sys/printk.h> #include <zephyr/bluetooth/bluetooth.h> #include <zephyr/bluetooth/hci.h> #include <zephyr/bluetooth/conn.h> #include <zephyr/bluetooth/uuid.h> #include <zephyr/bluetooth/gatt.h> #include <bluetooth/services/nus.h> #include <bluetooth/services/nus_client.h> #include <bluetooth/gatt_dm.h> #include <bluetooth/scan.h> #include <zephyr/settings/settings.h> #include <zephyr/drivers/uart.h> #include <zephyr/logging/log.h> #define LOG_MODULE_NAME central_uart LOG_MODULE_REGISTER(LOG_MODULE_NAME); /* UART payload buffer element size. */ #define UART_BUF_SIZE 256 #define KEY_PASSKEY_ACCEPT DK_BTN1_MSK #define KEY_PASSKEY_REJECT DK_BTN2_MSK #define NUS_WRITE_TIMEOUT K_MSEC(150) #define UART_WAIT_FOR_BUF_DELAY K_MSEC(50) #define UART_RX_TIMEOUT 50 #define DEVICE_NAME1 "NORDIC_UART_TEST" static const struct device *uart = DEVICE_DT_GET(DT_NODELABEL(uart0)); static struct k_work_delayable uart_work; K_SEM_DEFINE(nus_write_sem, 0, 1); struct uart_data_t { void *fifo_reserved; uint8_t data[UART_BUF_SIZE]; uint16_t len; }; static K_FIFO_DEFINE(fifo_uart_tx_data); static K_FIFO_DEFINE(fifo_uart_rx_data); static struct bt_conn *default_conn; static struct bt_nus_client nus_client; static void ble_data_sent(struct bt_nus_client *nus, uint8_t err, const uint8_t *const data, uint16_t len) { ARG_UNUSED(nus); struct uart_data_t *buf; /* Retrieve buffer context. */ buf = CONTAINER_OF(data, struct uart_data_t, data); k_free(buf); k_sem_give(&nus_write_sem); if (err) { LOG_WRN("ATT error code: 0x%02X", err); } } // edit here to verify data reception static uint8_t ble_data_received(struct bt_nus_client *nus, const uint8_t *data, uint16_t len) { ARG_UNUSED(nus); int err; for (uint16_t pos = 0; pos != len;) { struct uart_data_t *tx = k_malloc(sizeof(*tx)); if (!tx) { LOG_WRN("Not able to allocate UART send data buffer"); return BT_GATT_ITER_CONTINUE; } /* Keep the last byte of TX buffer for potential LF char. */ size_t tx_data_size = sizeof(tx->data) - 1; if ((len - pos) > tx_data_size) { tx->len = tx_data_size; } else { tx->len = (len - pos); } memcpy(tx->data, &data[pos], tx->len); pos += tx->len; /* Append the LF character when the CR character triggered * transmission from the peer. */ if ((pos == len) && (data[len - 1] == '\r')) { tx->data[tx->len] = '\n'; tx->len++; } //printf("UART data sent enabled here, check pin configuration to know the data being sent correctly or not!"); printk("%s\n",tx->data); LOG_INF("%s\n",tx->data); err = uart_tx(uart, tx->data, tx->len, SYS_FOREVER_MS); if (err) { k_fifo_put(&fifo_uart_tx_data, tx); } } return BT_GATT_ITER_CONTINUE; } static void uart_cb(const struct device *dev, struct uart_event *evt, void *user_data) { ARG_UNUSED(dev); static size_t aborted_len; struct uart_data_t *buf; static uint8_t *aborted_buf; static bool disable_req; switch (evt->type) { case UART_TX_DONE: LOG_DBG("UART_TX_DONE"); if ((evt->data.tx.len == 0) || (!evt->data.tx.buf)) { return; } if (aborted_buf) { buf = CONTAINER_OF(aborted_buf, struct uart_data_t, data); aborted_buf = NULL; aborted_len = 0; } else { buf = CONTAINER_OF(evt->data.tx.buf, struct uart_data_t, data); } k_free(buf); buf = k_fifo_get(&fifo_uart_tx_data, K_NO_WAIT); if (!buf) { return; } if (uart_tx(uart, buf->data, buf->len, SYS_FOREVER_MS)) { LOG_WRN("Failed to send data over UART"); } break; case UART_RX_RDY: LOG_DBG("UART_RX_RDY"); buf = CONTAINER_OF(evt->data.rx.buf, struct uart_data_t, data); buf->len += evt->data.rx.len; if (disable_req) { return; } if ((evt->data.rx.buf[buf->len - 1] == '\n') || (evt->data.rx.buf[buf->len - 1] == '\r')) { disable_req = true; uart_rx_disable(uart); } break; case UART_RX_DISABLED: LOG_DBG("UART_RX_DISABLED"); disable_req = false; buf = k_malloc(sizeof(*buf)); if (buf) { buf->len = 0; } else { LOG_WRN("Not able to allocate UART receive buffer"); k_work_reschedule(&uart_work, UART_WAIT_FOR_BUF_DELAY); return; } uart_rx_enable(uart, buf->data, sizeof(buf->data), UART_RX_TIMEOUT); break; case UART_RX_BUF_REQUEST: LOG_DBG("UART_RX_BUF_REQUEST"); buf = k_malloc(sizeof(*buf)); if (buf) { buf->len = 0; uart_rx_buf_rsp(uart, buf->data, sizeof(buf->data)); } else { LOG_WRN("Not able to allocate UART receive buffer"); } break; case UART_RX_BUF_RELEASED: LOG_DBG("UART_RX_BUF_RELEASED"); buf = CONTAINER_OF(evt->data.rx_buf.buf, struct uart_data_t, data); if (buf->len > 0) { k_fifo_put(&fifo_uart_rx_data, buf); } else { k_free(buf); } break; case UART_TX_ABORTED: LOG_DBG("UART_TX_ABORTED"); if (!aborted_buf) { aborted_buf = (uint8_t *)evt->data.tx.buf; } aborted_len += evt->data.tx.len; buf = CONTAINER_OF(aborted_buf, struct uart_data_t, data); uart_tx(uart, &buf->data[aborted_len], buf->len - aborted_len, SYS_FOREVER_MS); break; default: break; } } static void uart_work_handler(struct k_work *item) { struct uart_data_t *buf; buf = k_malloc(sizeof(*buf)); if (buf) { buf->len = 0; } else { LOG_WRN("Not able to allocate UART receive buffer"); k_work_reschedule(&uart_work, UART_WAIT_FOR_BUF_DELAY); return; } uart_rx_enable(uart, buf->data, sizeof(buf->data), UART_RX_TIMEOUT); } static int uart_init(void) { int err; struct uart_data_t *rx; if (!device_is_ready(uart)) { LOG_ERR("UART device not ready"); return -ENODEV; } rx = k_malloc(sizeof(*rx)); if (rx) { rx->len = 0; } else { return -ENOMEM; } k_work_init_delayable(&uart_work, uart_work_handler); err = uart_callback_set(uart, uart_cb, NULL); if (err) { return err; } return uart_rx_enable(uart, rx->data, sizeof(rx->data), UART_RX_TIMEOUT); } static void discovery_complete(struct bt_gatt_dm *dm, void *context) { struct bt_nus_client *nus = context; LOG_INF("Service discovery completed"); bt_gatt_dm_data_print(dm); bt_nus_handles_assign(dm, nus); bt_nus_subscribe_receive(nus); bt_gatt_dm_data_release(dm); } static void discovery_service_not_found(struct bt_conn *conn, void *context) { LOG_INF("Service not found"); } static void discovery_error(struct bt_conn *conn, int err, void *context) { LOG_WRN("Error while discovering GATT database: (%d)", err); } struct bt_gatt_dm_cb discovery_cb = { .completed = discovery_complete, .service_not_found = discovery_service_not_found, .error_found = discovery_error, }; static void gatt_discover(struct bt_conn *conn) { int err; if (conn != default_conn) { return; } err = bt_gatt_dm_start(conn, BT_UUID_NUS_SERVICE, &discovery_cb, &nus_client); if (err) { LOG_ERR("could not start the discovery procedure, error " "code: %d", err); } } static void exchange_func(struct bt_conn *conn, uint8_t err, struct bt_gatt_exchange_params *params) { if (!err) { LOG_INF("MTU exchange done"); } else { LOG_WRN("MTU exchange failed (err %" PRIu8 ")", err); } } static void connected(struct bt_conn *conn, uint8_t conn_err) { char addr[BT_ADDR_LE_STR_LEN]; int err; bt_addr_le_to_str(bt_conn_get_dst(conn), addr, sizeof(addr)); if (conn_err) { LOG_INF("Failed to connect to %s (%d)", addr, conn_err); if (default_conn == conn) { bt_conn_unref(default_conn); default_conn = NULL; err = bt_scan_start(BT_SCAN_TYPE_SCAN_ACTIVE); if (err) { LOG_ERR("Scanning failed to start (err %d)", err); } } return; } LOG_INF("Connected: %s", addr); static struct bt_gatt_exchange_params exchange_params; exchange_params.func = exchange_func; err = bt_gatt_exchange_mtu(conn, &exchange_params); if (err) { LOG_WRN("MTU exchange failed (err %d)", err); } // err = bt_conn_set_security(conn, BT_SECURITY_L1); // if (err) { // LOG_WRN("Failed to set security: %d", err); // gatt_discover(conn); // } err = bt_scan_stop(); if ((!err) && (err != -EALREADY)) { LOG_ERR("Stop LE scan failed (err %d)", err); } } static void disconnected(struct bt_conn *conn, uint8_t reason) { char addr[BT_ADDR_LE_STR_LEN]; int err; bt_addr_le_to_str(bt_conn_get_dst(conn), addr, sizeof(addr)); LOG_INF("Disconnected: %s (reason %u)", addr, reason); if (default_conn != conn) { return; } bt_conn_unref(default_conn); default_conn = NULL; err = bt_scan_start(BT_SCAN_TYPE_SCAN_ACTIVE); if (err) { LOG_ERR("Scanning failed to start (err %d)", err); } } static void security_changed(struct bt_conn *conn, bt_security_t level, enum bt_security_err err) { char addr[BT_ADDR_LE_STR_LEN]; bt_addr_le_to_str(bt_conn_get_dst(conn), addr, sizeof(addr)); if (!err) { LOG_INF("Security changed: %s level %u", addr, level); } else { LOG_WRN("Security failed: %s level %u err %d", addr, level, err); } gatt_discover(conn); } BT_CONN_CB_DEFINE(conn_callbacks) = { .connected = connected, .disconnected = disconnected, .security_changed = security_changed }; static void scan_filter_match(struct bt_scan_device_info *device_info, struct bt_scan_filter_match *filter_match, bool connectable) { char addr[BT_ADDR_LE_STR_LEN]; bt_addr_le_to_str(device_info->recv_info->addr, addr, sizeof(addr)); LOG_INF("Filters matched. Address: %s connectable: %d", addr, connectable); } static void scan_connecting_error(struct bt_scan_device_info *device_info) { LOG_WRN("Connecting failed"); } static void scan_connecting(struct bt_scan_device_info *device_info, struct bt_conn *conn) { default_conn = bt_conn_ref(conn); } static int nus_client_init(void) { int err; struct bt_nus_client_init_param init = { .cb = { .received = ble_data_received, .sent = ble_data_sent, } }; err = bt_nus_client_init(&nus_client, &init); if (err) { LOG_ERR("NUS Client initialization failed (err %d)", err); return err; } LOG_INF("NUS Client module initialized"); return err; } BT_SCAN_CB_INIT(scan_cb, scan_filter_match, NULL, scan_connecting_error, scan_connecting); static int scan_init(void) { int err; struct bt_scan_init_param scan_init = { .connect_if_match = 1, }; bt_scan_init(&scan_init); bt_scan_cb_register(&scan_cb); err = bt_scan_filter_add(BT_SCAN_FILTER_TYPE_UUID, BT_UUID_NUS_SERVICE); if (err) { LOG_ERR("Scanning filters cannot be set (err %d)", err); return err; } err = bt_scan_filter_add(BT_SCAN_FILTER_TYPE_NAME, DEVICE_NAME1); if (err) { LOG_ERR("Scanning filters cannot be set (err %d)", err); return err; } err = bt_scan_filter_enable(BT_SCAN_UUID_FILTER, true); if (err) { LOG_ERR("Filters cannot be turned on (err %d)", err); return err; } err = bt_scan_filter_enable(BT_SCAN_NAME_FILTER, true); if (err) { LOG_ERR("Filters cannot be turned on (err %d)", err); return err; } LOG_INF("Scan module initialized"); return err; } static void auth_cancel(struct bt_conn *conn) { char addr[BT_ADDR_LE_STR_LEN]; bt_addr_le_to_str(bt_conn_get_dst(conn), addr, sizeof(addr)); LOG_INF("Pairing cancelled: %s", addr); } static void pairing_complete(struct bt_conn *conn, bool bonded) { char addr[BT_ADDR_LE_STR_LEN]; bt_addr_le_to_str(bt_conn_get_dst(conn), addr, sizeof(addr)); LOG_INF("Pairing completed: %s, bonded: %d", addr, bonded); } static void pairing_failed(struct bt_conn *conn, enum bt_security_err reason) { char addr[BT_ADDR_LE_STR_LEN]; bt_addr_le_to_str(bt_conn_get_dst(conn), addr, sizeof(addr)); LOG_WRN("Pairing failed conn: %s, reason %d", addr, reason); } static struct bt_conn_auth_cb conn_auth_callbacks = { .cancel = auth_cancel, }; static struct bt_conn_auth_info_cb conn_auth_info_callbacks = { .pairing_complete = pairing_complete, .pairing_failed = pairing_failed }; int main(void) { int err; err = bt_conn_auth_cb_register(&conn_auth_callbacks); if (err) { LOG_ERR("Failed to register authorization callbacks."); return 0; } err = bt_conn_auth_info_cb_register(&conn_auth_info_callbacks); if (err) { printk("Failed to register authorization info callbacks.\n"); return 0; } err = bt_enable(NULL); if (err) { LOG_ERR("Bluetooth init failed (err %d)", err); return 0; } LOG_INF("Bluetooth initialized"); if (IS_ENABLED(CONFIG_SETTINGS)) { settings_load(); } err = uart_init(); if (err != 0) { LOG_ERR("uart_init failed (err %d)", err); return 0; } err = scan_init(); if (err != 0) { LOG_ERR("scan_init failed (err %d)", err); return 0; } err = nus_client_init(); if (err != 0) { LOG_ERR("nus_client_init failed (err %d)", err); return 0; } printk("Starting Bluetooth Central UART example\n"); printk("testing--------->\n"); err = bt_scan_start(BT_SCAN_TYPE_SCAN_ACTIVE); if (err) { LOG_ERR("Scanning failed to start (err %d)", err); return 0; } LOG_INF("Scanning successfully started"); for (;;) { /* Wait indefinitely for data to be sent over Bluetooth */ struct uart_data_t *buf = k_fifo_get(&fifo_uart_rx_data, K_FOREVER); err = bt_nus_client_send(&nus_client, buf->data, buf->len); if (err) { LOG_WRN("Failed to send data over BLE connection" "(err %d)", err); } err = k_sem_take(&nus_write_sem, NUS_WRITE_TIMEOUT); if (err) { LOG_WRN("NUS send timeout"); } } }
/** * Copyright (c) 2014 - 2021, Nordic Semiconductor ASA * * All rights reserved. * * Redistribution and use in source and binary forms, with or without modification, * are permitted provided that the following conditions are met: * * 1. Redistributions of source code must retain the above copyright notice, this * list of conditions and the following disclaimer. * * 2. Redistributions in binary form, except as embedded into a Nordic * Semiconductor ASA integrated circuit in a product or a software update for * such product, must reproduce the above copyright notice, this list of * conditions and the following disclaimer in the documentation and/or other * materials provided with the distribution. * * 3. Neither the name of Nordic Semiconductor ASA nor the names of its * contributors may be used to endorse or promote products derived from this * software without specific prior written permission. * * 4. This software, with or without modification, must only be used with a * Nordic Semiconductor ASA integrated circuit. * * 5. Any software provided in binary form under this license must not be reverse * engineered, decompiled, modified and/or disassembled. * * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * */ /** @file * * @defgroup ble_sdk_uart_over_ble_main main.c * @{ * @ingroup ble_sdk_app_nus_eval * @brief UART over BLE application main file. * * This file contains the source code for a sample application that uses the Nordic UART service. * This application uses the @ref srvlib_conn_params module. */ #include <stdint.h> #include <string.h> #include "nordic_common.h" #include "nrf.h" #include "ble_hci.h" #include "ble_advdata.h" #include "ble_advertising.h" #include "ble_conn_params.h" #include "nrf_sdh.h" #include "nrf_sdh_soc.h" #include "nrf_sdh_ble.h" #include "nrf_ble_gatt.h" #include "nrf_ble_qwr.h" #include "app_timer.h" #include "ble_nus.h" #include "app_uart.h" #include "app_util_platform.h" #include "bsp_btn_ble.h" #include "nrf_pwr_mgmt.h" #if defined (UART_PRESENT) #include "nrf_uart.h" #endif #if defined (UARTE_PRESENT) #include "nrf_uarte.h" #endif #include "nrf_log.h" #include "nrf_log_ctrl.h" #include "nrf_log_default_backends.h" #define APP_BLE_CONN_CFG_TAG 1 /**< A tag identifying the SoftDevice BLE configuration. */ #define DEVICE_NAME "NORDIC_UART_TEST" /**< Name of device. Will be included in the advertising data. */ #define NUS_SERVICE_UUID_TYPE BLE_UUID_TYPE_VENDOR_BEGIN /**< UUID type for the Nordic UART Service (vendor specific). */ #define APP_BLE_OBSERVER_PRIO 3 /**< Application's BLE observer priority. You shouldn't need to modify this value. */ #define APP_ADV_INTERVAL 64 /**< The advertising interval (in units of 0.625 ms. This value corresponds to 40 ms). */ #define APP_ADV_DURATION 18000 /**< The advertising duration (180 seconds) in units of 10 milliseconds. */ #define MIN_CONN_INTERVAL MSEC_TO_UNITS(20, UNIT_1_25_MS) /**< Minimum acceptable connection interval (20 ms), Connection interval uses 1.25 ms units. */ #define MAX_CONN_INTERVAL MSEC_TO_UNITS(75, UNIT_1_25_MS) /**< Maximum acceptable connection interval (75 ms), Connection interval uses 1.25 ms units. */ #define SLAVE_LATENCY 0 /**< Slave latency. */ #define CONN_SUP_TIMEOUT MSEC_TO_UNITS(4000, UNIT_10_MS) /**< Connection supervisory timeout (4 seconds), Supervision Timeout uses 10 ms units. */ #define FIRST_CONN_PARAMS_UPDATE_DELAY APP_TIMER_TICKS(5000) /**< Time from initiating event (connect or start of notification) to first time sd_ble_gap_conn_param_update is called (5 seconds). */ #define NEXT_CONN_PARAMS_UPDATE_DELAY APP_TIMER_TICKS(30000) /**< Time between each call to sd_ble_gap_conn_param_update after the first call (30 seconds). */ #define MAX_CONN_PARAMS_UPDATE_COUNT 3 /**< Number of attempts before giving up the connection parameter negotiation. */ #define DEAD_BEEF 0xDEADBEEF /**< Value used as error code on stack dump, can be used to identify stack location on stack unwind. */ #define UART_TX_BUF_SIZE 256 /**< UART TX buffer size. */ #define UART_RX_BUF_SIZE 256 /**< UART RX buffer size. */ #define TIMER_INTERVAL APP_TIMER_TICKS(5000) // 5 seconds APP_TIMER_DEF(m_data_send_timer); BLE_NUS_DEF(m_nus, NRF_SDH_BLE_TOTAL_LINK_COUNT); /**< BLE NUS service instance. */ NRF_BLE_GATT_DEF(m_gatt); /**< GATT module instance. */ NRF_BLE_QWR_DEF(m_qwr); /**< Context for the Queued Write module.*/ BLE_ADVERTISING_DEF(m_advertising); /**< Advertising module instance. */ static uint16_t m_conn_handle = BLE_CONN_HANDLE_INVALID; /**< Handle of the current connection. */ static uint16_t m_ble_nus_max_data_len = BLE_GATT_ATT_MTU_DEFAULT - 3; /**< Maximum length of data (in bytes) that can be transmitted to the peer by the Nordic UART service module. */ static ble_uuid_t m_adv_uuids[] = /**< Universally unique service identifier. */ { {BLE_UUID_NUS_SERVICE, NUS_SERVICE_UUID_TYPE} }; /**@brief Function for assert macro callback. * * @details This function will be called in case of an assert in the SoftDevice. * * @warning This handler is an example only and does not fit a final product. You need to analyse * how your product is supposed to react in case of Assert. * @warning On assert from the SoftDevice, the system can only recover on reset. * * @param[in] line_num Line number of the failing ASSERT call. * @param[in] p_file_name File name of the failing ASSERT call. */ void assert_nrf_callback(uint16_t line_num, const uint8_t * p_file_name) { app_error_handler(DEAD_BEEF, line_num, p_file_name); } /**@brief Function for initializing the timer module. */ //static void timers_init(void) //{ // ret_code_t err_code = app_timer_init(); // APP_ERROR_CHECK(err_code); //} /**@brief Function for the GAP initialization. * * @details This function will set up all the necessary GAP (Generic Access Profile) parameters of * the device. It also sets the permissions and appearance. */ static void gap_params_init(void) { uint32_t err_code; ble_gap_conn_params_t gap_conn_params; ble_gap_conn_sec_mode_t sec_mode; BLE_GAP_CONN_SEC_MODE_SET_OPEN(&sec_mode); err_code = sd_ble_gap_device_name_set(&sec_mode, (const uint8_t *) DEVICE_NAME, strlen(DEVICE_NAME)); APP_ERROR_CHECK(err_code); memset(&gap_conn_params, 0, sizeof(gap_conn_params)); gap_conn_params.min_conn_interval = MIN_CONN_INTERVAL; gap_conn_params.max_conn_interval = MAX_CONN_INTERVAL; gap_conn_params.slave_latency = SLAVE_LATENCY; gap_conn_params.conn_sup_timeout = CONN_SUP_TIMEOUT; err_code = sd_ble_gap_ppcp_set(&gap_conn_params); APP_ERROR_CHECK(err_code); } /**@brief Function for handling Queued Write Module errors. * * @details A pointer to this function will be passed to each service which may need to inform the * application about an error. * * @param[in] nrf_error Error code containing information about what went wrong. */ static void nrf_qwr_error_handler(uint32_t nrf_error) { APP_ERROR_HANDLER(nrf_error); } /**@brief Function for handling the data from the Nordic UART Service. * * @details This function will process the data received from the Nordic UART BLE Service and send * it to the UART module. * * @param[in] p_evt Nordic UART Service event. */ /**@snippet [Handling the data received over BLE] */ static void nus_data_handler(ble_nus_evt_t * p_evt) { if (p_evt->type == BLE_NUS_EVT_RX_DATA) { uint32_t err_code; NRF_LOG_DEBUG("Received data from BLE NUS. Writing data on UART."); NRF_LOG_HEXDUMP_DEBUG(p_evt->params.rx_data.p_data, p_evt->params.rx_data.length); for (uint32_t i = 0; i < p_evt->params.rx_data.length; i++) { do { err_code = app_uart_put(p_evt->params.rx_data.p_data[i]); if ((err_code != NRF_SUCCESS) && (err_code != NRF_ERROR_BUSY)) { NRF_LOG_ERROR("Failed receiving NUS message. Error 0x%x. ", err_code); APP_ERROR_CHECK(err_code); } } while (err_code == NRF_ERROR_BUSY); } if (p_evt->params.rx_data.p_data[p_evt->params.rx_data.length - 1] == '\r') { while (app_uart_put('\n') == NRF_ERROR_BUSY); } } } /**@snippet [Handling the data received over BLE] */ /**@brief Function for initializing services that will be used by the application. */ static void services_init(void) { uint32_t err_code; ble_nus_init_t nus_init; nrf_ble_qwr_init_t qwr_init = {0}; // Initialize Queued Write Module. qwr_init.error_handler = nrf_qwr_error_handler; err_code = nrf_ble_qwr_init(&m_qwr, &qwr_init); APP_ERROR_CHECK(err_code); // Initialize NUS. memset(&nus_init, 0, sizeof(nus_init)); nus_init.data_handler = nus_data_handler; err_code = ble_nus_init(&m_nus, &nus_init); APP_ERROR_CHECK(err_code); } /**@brief Function for handling an event from the Connection Parameters Module. * * @details This function will be called for all events in the Connection Parameters Module * which are passed to the application. * * @note All this function does is to disconnect. This could have been done by simply setting * the disconnect_on_fail config parameter, but instead we use the event handler * mechanism to demonstrate its use. * * @param[in] p_evt Event received from the Connection Parameters Module. */ static void on_conn_params_evt(ble_conn_params_evt_t * p_evt) { uint32_t err_code; if (p_evt->evt_type == BLE_CONN_PARAMS_EVT_FAILED) { err_code = sd_ble_gap_disconnect(m_conn_handle, BLE_HCI_CONN_INTERVAL_UNACCEPTABLE); APP_ERROR_CHECK(err_code); } } /**@brief Function for handling errors from the Connection Parameters module. * * @param[in] nrf_error Error code containing information about what went wrong. */ static void conn_params_error_handler(uint32_t nrf_error) { APP_ERROR_HANDLER(nrf_error); } /**@brief Function for initializing the Connection Parameters module. */ static void conn_params_init(void) { uint32_t err_code; ble_conn_params_init_t cp_init; memset(&cp_init, 0, sizeof(cp_init)); cp_init.p_conn_params = NULL; cp_init.first_conn_params_update_delay = FIRST_CONN_PARAMS_UPDATE_DELAY; cp_init.next_conn_params_update_delay = NEXT_CONN_PARAMS_UPDATE_DELAY; cp_init.max_conn_params_update_count = MAX_CONN_PARAMS_UPDATE_COUNT; cp_init.start_on_notify_cccd_handle = BLE_GATT_HANDLE_INVALID; cp_init.disconnect_on_fail = false; cp_init.evt_handler = on_conn_params_evt; cp_init.error_handler = conn_params_error_handler; err_code = ble_conn_params_init(&cp_init); APP_ERROR_CHECK(err_code); } /**@brief Function for putting the chip into sleep mode. * * @note This function will not return. */ static void sleep_mode_enter(void) { uint32_t err_code = bsp_indication_set(BSP_INDICATE_IDLE); APP_ERROR_CHECK(err_code); // Prepare wakeup buttons. err_code = bsp_btn_ble_sleep_mode_prepare(); APP_ERROR_CHECK(err_code); // Go to system-off mode (this function will not return; wakeup will cause a reset). err_code = sd_power_system_off(); APP_ERROR_CHECK(err_code); } /**@brief Function for handling advertising events. * * @details This function will be called for advertising events which are passed to the application. * * @param[in] ble_adv_evt Advertising event. */ static void on_adv_evt(ble_adv_evt_t ble_adv_evt) { uint32_t err_code; switch (ble_adv_evt) { case BLE_ADV_EVT_FAST: err_code = bsp_indication_set(BSP_INDICATE_ADVERTISING); APP_ERROR_CHECK(err_code); break; case BLE_ADV_EVT_IDLE: sleep_mode_enter(); break; default: break; } } /**@brief Function for handling BLE events. * * @param[in] p_ble_evt Bluetooth stack event. * @param[in] p_context Unused. */ static void ble_evt_handler(ble_evt_t const * p_ble_evt, void * p_context) { uint32_t err_code; switch (p_ble_evt->header.evt_id) { case BLE_GAP_EVT_CONNECTED: NRF_LOG_INFO("Connected"); err_code = bsp_indication_set(BSP_INDICATE_CONNECTED); APP_ERROR_CHECK(err_code); m_conn_handle = p_ble_evt->evt.gap_evt.conn_handle; err_code = nrf_ble_qwr_conn_handle_assign(&m_qwr, m_conn_handle); APP_ERROR_CHECK(err_code); break; case BLE_GAP_EVT_DISCONNECTED: NRF_LOG_INFO("Disconnected"); // LED indication will be changed when advertising starts. m_conn_handle = BLE_CONN_HANDLE_INVALID; break; case BLE_GAP_EVT_PHY_UPDATE_REQUEST: { NRF_LOG_DEBUG("PHY update request."); ble_gap_phys_t const phys = { .rx_phys = BLE_GAP_PHY_AUTO, .tx_phys = BLE_GAP_PHY_AUTO, }; err_code = sd_ble_gap_phy_update(p_ble_evt->evt.gap_evt.conn_handle, &phys); APP_ERROR_CHECK(err_code); } break; case BLE_GAP_EVT_SEC_PARAMS_REQUEST: // Pairing not supported err_code = sd_ble_gap_sec_params_reply(m_conn_handle, BLE_GAP_SEC_STATUS_PAIRING_NOT_SUPP, NULL, NULL); APP_ERROR_CHECK(err_code); break; case BLE_GATTS_EVT_SYS_ATTR_MISSING: // No system attributes have been stored. err_code = sd_ble_gatts_sys_attr_set(m_conn_handle, NULL, 0, 0); APP_ERROR_CHECK(err_code); break; case BLE_GATTC_EVT_TIMEOUT: // Disconnect on GATT Client timeout event. err_code = sd_ble_gap_disconnect(p_ble_evt->evt.gattc_evt.conn_handle, BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION); APP_ERROR_CHECK(err_code); break; case BLE_GATTS_EVT_TIMEOUT: // Disconnect on GATT Server timeout event. err_code = sd_ble_gap_disconnect(p_ble_evt->evt.gatts_evt.conn_handle, BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION); APP_ERROR_CHECK(err_code); break; default: // No implementation needed. break; } } /**@brief Function for the SoftDevice initialization. * * @details This function initializes the SoftDevice and the BLE event interrupt. */ static void ble_stack_init(void) { ret_code_t err_code; err_code = nrf_sdh_enable_request(); APP_ERROR_CHECK(err_code); // Configure the BLE stack using the default settings. // Fetch the start address of the application RAM. uint32_t ram_start = 0; err_code = nrf_sdh_ble_default_cfg_set(APP_BLE_CONN_CFG_TAG, &ram_start); APP_ERROR_CHECK(err_code); // Enable BLE stack. err_code = nrf_sdh_ble_enable(&ram_start); APP_ERROR_CHECK(err_code); // Register a handler for BLE events. NRF_SDH_BLE_OBSERVER(m_ble_observer, APP_BLE_OBSERVER_PRIO, ble_evt_handler, NULL); } /**@brief Function for handling events from the GATT library. */ void gatt_evt_handler(nrf_ble_gatt_t * p_gatt, nrf_ble_gatt_evt_t const * p_evt) { if ((m_conn_handle == p_evt->conn_handle) && (p_evt->evt_id == NRF_BLE_GATT_EVT_ATT_MTU_UPDATED)) { m_ble_nus_max_data_len = p_evt->params.att_mtu_effective - OPCODE_LENGTH - HANDLE_LENGTH; NRF_LOG_INFO("Data len is set to 0x%X(%d)", m_ble_nus_max_data_len, m_ble_nus_max_data_len); } NRF_LOG_DEBUG("ATT MTU exchange completed. central 0x%x peripheral 0x%x", p_gatt->att_mtu_desired_central, p_gatt->att_mtu_desired_periph); } /**@brief Function for initializing the GATT library. */ void gatt_init(void) { ret_code_t err_code; err_code = nrf_ble_gatt_init(&m_gatt, gatt_evt_handler); APP_ERROR_CHECK(err_code); err_code = nrf_ble_gatt_att_mtu_periph_set(&m_gatt, NRF_SDH_BLE_GATT_MAX_MTU_SIZE); APP_ERROR_CHECK(err_code); } /**@brief Function for handling events from the BSP module. * * @param[in] event Event generated by button press. */ void bsp_event_handler(bsp_event_t event) { uint32_t err_code; switch (event) { case BSP_EVENT_SLEEP: sleep_mode_enter(); break; case BSP_EVENT_DISCONNECT: err_code = sd_ble_gap_disconnect(m_conn_handle, BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION); if (err_code != NRF_ERROR_INVALID_STATE) { APP_ERROR_CHECK(err_code); } break; case BSP_EVENT_WHITELIST_OFF: if (m_conn_handle == BLE_CONN_HANDLE_INVALID) { err_code = ble_advertising_restart_without_whitelist(&m_advertising); if (err_code != NRF_ERROR_INVALID_STATE) { APP_ERROR_CHECK(err_code); } } break; default: break; } } /**@brief Function for handling app_uart events. * * @details This function will receive a single character from the app_uart module and append it to * a string. The string will be be sent over BLE when the last character received was a * 'new line' '\n' (hex 0x0A) or if the string has reached the maximum data length. */ /**@snippet [Handling the data received over UART] */ void uart_event_handle(app_uart_evt_t * p_event) { static uint8_t data_array[BLE_NUS_MAX_DATA_LEN]; static uint8_t index = 0; uint32_t err_code; switch (p_event->evt_type) { case APP_UART_DATA_READY: UNUSED_VARIABLE(app_uart_get(&data_array[index])); index++; if ((data_array[index - 1] == '\n') || (data_array[index - 1] == '\r') || (index >= m_ble_nus_max_data_len)) { if (index > 1) { NRF_LOG_DEBUG("Ready to send data over BLE NUS"); NRF_LOG_HEXDUMP_DEBUG(data_array, index); do { uint16_t length = (uint16_t)index; err_code = ble_nus_data_send(&m_nus, data_array, &length, m_conn_handle); if ((err_code != NRF_ERROR_INVALID_STATE) && (err_code != NRF_ERROR_RESOURCES) && (err_code != NRF_ERROR_NOT_FOUND)) { APP_ERROR_CHECK(err_code); } } while (err_code == NRF_ERROR_RESOURCES); } index = 0; } break; case APP_UART_COMMUNICATION_ERROR: APP_ERROR_HANDLER(p_event->data.error_communication); break; case APP_UART_FIFO_ERROR: APP_ERROR_HANDLER(p_event->data.error_code); break; default: break; } } /**@snippet [Handling the data received over UART] */ /**@brief Function for initializing the UART module. */ /**@snippet [UART Initialization] */ static void uart_init(void) { uint32_t err_code; app_uart_comm_params_t const comm_params = { .rx_pin_no = RX_PIN_NUMBER, .tx_pin_no = TX_PIN_NUMBER, .rts_pin_no = RTS_PIN_NUMBER, .cts_pin_no = CTS_PIN_NUMBER, .flow_control = APP_UART_FLOW_CONTROL_DISABLED, .use_parity = false, #if defined (UART_PRESENT) .baud_rate = NRF_UART_BAUDRATE_115200 #else .baud_rate = NRF_UARTE_BAUDRATE_115200 #endif }; APP_UART_FIFO_INIT(&comm_params, UART_RX_BUF_SIZE, UART_TX_BUF_SIZE, uart_event_handle, APP_IRQ_PRIORITY_LOWEST, err_code); APP_ERROR_CHECK(err_code); } /**@snippet [UART Initialization] */ /**@brief Function for initializing the Advertising functionality. */ static void advertising_init(void) { uint32_t err_code; ble_advertising_init_t init; memset(&init, 0, sizeof(init)); init.advdata.name_type = BLE_ADVDATA_FULL_NAME; init.advdata.include_appearance = false; init.advdata.flags = BLE_GAP_ADV_FLAGS_LE_ONLY_LIMITED_DISC_MODE; init.srdata.uuids_complete.uuid_cnt = sizeof(m_adv_uuids) / sizeof(m_adv_uuids[0]); init.srdata.uuids_complete.p_uuids = m_adv_uuids; init.config.ble_adv_fast_enabled = true; init.config.ble_adv_fast_interval = APP_ADV_INTERVAL; init.config.ble_adv_fast_timeout = APP_ADV_DURATION; init.evt_handler = on_adv_evt; err_code = ble_advertising_init(&m_advertising, &init); APP_ERROR_CHECK(err_code); ble_advertising_conn_cfg_tag_set(&m_advertising, APP_BLE_CONN_CFG_TAG); } /**@brief Function for initializing buttons and leds. * * @param[out] p_erase_bonds Will be true if the clear bonding button was pressed to wake the application up. */ static void buttons_leds_init(bool * p_erase_bonds) { bsp_event_t startup_event; uint32_t err_code = bsp_init(BSP_INIT_LEDS | BSP_INIT_BUTTONS, bsp_event_handler); APP_ERROR_CHECK(err_code); err_code = bsp_btn_ble_init(NULL, &startup_event); APP_ERROR_CHECK(err_code); *p_erase_bonds = (startup_event == BSP_EVENT_CLEAR_BONDING_DATA); } /**@brief Function for initializing the nrf log module. */ static void log_init(void) { ret_code_t err_code = NRF_LOG_INIT(NULL); APP_ERROR_CHECK(err_code); NRF_LOG_DEFAULT_BACKENDS_INIT(); } /**@brief Function for initializing power management. */ static void power_management_init(void) { ret_code_t err_code; err_code = nrf_pwr_mgmt_init(); APP_ERROR_CHECK(err_code); } /**@brief Function for handling the idle state (main loop). * * @details If there is no pending log operation, then sleep until next the next event occurs. */ static void idle_state_handle(void) { if (NRF_LOG_PROCESS() == false) { nrf_pwr_mgmt_run(); } } /**@brief Function for starting advertising. */ static void advertising_start(void) { uint32_t err_code = ble_advertising_start(&m_advertising, BLE_ADV_MODE_FAST); APP_ERROR_CHECK(err_code); } //-------------------- user code static void data_send_timeout_handler(void * p_context) { // Function to be called when the timer expires uint8_t data_to_send[] = "Sphinx of black quartz, judge my vow. Pack my box with five dozen liquor jugs. The quick brown fox jumps over the lazy dog. How razorback-jumping frogs can level six piqued gymnasts! Mr. Jock, TV quiz PhD, bags few lynx. Waltz, testing UART services test"; // Example data uint16_t length = sizeof(data_to_send); ret_code_t err_code = ble_nus_data_send(&m_nus, data_to_send, &length, m_conn_handle); if ((err_code != NRF_ERROR_INVALID_STATE) && (err_code != NRF_ERROR_RESOURCES) && (err_code != NRF_ERROR_NOT_FOUND)) { APP_ERROR_CHECK(err_code); printf("ERROR in BLE transmission\n\r"); } printf("send sucessful\r\n"); } static void timers_init(void) { ret_code_t err_code = app_timer_init(); APP_ERROR_CHECK(err_code); // Initialize timer for sending data periodically err_code = app_timer_create(&m_data_send_timer, APP_TIMER_MODE_REPEATED, data_send_timeout_handler); APP_ERROR_CHECK(err_code); } //-------------------- user code /**@brief Application main function. */ int main(void) { bool erase_bonds; // Initialize. uart_init(); log_init(); timers_init(); buttons_leds_init(&erase_bonds); power_management_init(); ble_stack_init(); gap_params_init(); gatt_init(); services_init(); advertising_init(); conn_params_init(); // Start execution. printf("\r\nUART started.\r\n"); NRF_LOG_INFO("Debug logging for UART over RTT started."); advertising_start(); ret_code_t err_code = app_timer_start(m_data_send_timer, TIMER_INTERVAL, NULL); // Enter main loop. for (;;) { idle_state_handle(); } } /** * @} */