mirror of
https://github.com/espressif/esp-idf.git
synced 2026-10-01 10:40:47 +03:00
Zhi Wei Jian
47dba07536
(cherry picked from commit 9de3eea3de)
Co-authored-by: zhiweijian <zhiweijian@espressif.com>
64 lines
1.9 KiB
C
64 lines
1.9 KiB
C
/*
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* SPDX-FileCopyrightText: 2026 Espressif Systems (Shanghai) CO LTD
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*
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* SPDX-License-Identifier: Unlicense OR CC0-1.0
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*
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* BLE UART Service example. Backend (NimBLE / Bluedroid) is picked
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* by the host-stack Kconfig at compile time. Whatever the central
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* writes to the RX characteristic is echoed back over TX.
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*/
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#include <stdio.h>
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#include "esp_log.h"
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#include "esp_mac.h"
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#include "nvs_flash.h"
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#include "sdkconfig.h"
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#include "ble_uart.h"
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static const char *TAG = "app";
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static void ble_uart_on_rx(const uint8_t *data, size_t len)
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{
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ESP_LOGI(TAG, "rx len: %u bytes", (unsigned)len);
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if (data == NULL || len == 0) {
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return;
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}
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ESP_LOG_BUFFER_HEX(TAG, data, len);
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ble_uart_tx(data, len); /* echo back */
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}
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void app_main(void)
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{
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/* NVS is required by the BT controller (PHY calibration) and the
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* bond store, so it must be live before ble_uart_install(). */
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esp_err_t err = nvs_flash_init();
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if (err == ESP_ERR_NVS_NO_FREE_PAGES || err == ESP_ERR_NVS_NEW_VERSION_FOUND) {
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ESP_ERROR_CHECK(nvs_flash_erase());
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err = nvs_flash_init();
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}
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ESP_ERROR_CHECK(err);
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/* Device name = "<prefix>-XXXX" with XXXX = last two MAC bytes.
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* If esp_read_mac() fails, mac stays zero and the suffix degrades
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* to "0000" — log so the operator notices uniqueness was lost. */
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uint8_t mac[6] = {0};
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esp_err_t mac_err = esp_read_mac(mac, ESP_MAC_BT);
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if (mac_err != ESP_OK) {
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ESP_LOGW(TAG, "esp_read_mac(BT) failed (%s); device name suffix will be 0000",
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esp_err_to_name(mac_err));
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}
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char name[24];
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snprintf(name, sizeof(name), "%s-%02X%02X",
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CONFIG_BLE_UART_DEVICE_NAME_PREFIX, mac[4], mac[5]);
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ESP_ERROR_CHECK(ble_uart_install(&(ble_uart_config_t){
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.encrypted = true,
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.device_name = name,
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.ble_uart_on_rx = ble_uart_on_rx,
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}));
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ESP_ERROR_CHECK(ble_uart_open());
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}
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