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/*
* SPDX-FileCopyrightText: 2024-2025 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Unlicense OR CC0-1.0
*/
#include "esp_log.h"
#include "nvs_flash.h"
/* BLE */
#include "nimble/nimble_port.h"
#include "nimble/nimble_port_freertos.h"
#include "host/ble_hs.h"
#include "host/util/util.h"
#define TAG "NimBLE_BLE_PAwR"
#define TARGET_NAME "Nimble_PAwR"
#define BLE_PAWR_RSP_DATA_LEN (16)
static uint8_t sub_data_pattern[BLE_PAWR_RSP_DATA_LEN] = {0};
static int create_periodic_sync(struct ble_gap_ext_disc_desc *disc);
static void start_scan(void);
static struct ble_hs_adv_fields fields;
static bool synced = false;
uint8_t rsp_slot_idx = 0;
static int
gap_event_cb(struct ble_gap_event *event, void *arg)
{
int rc;
uint8_t *addr;
struct ble_gap_ext_disc_desc *disc;
switch (event->type) {
case BLE_GAP_EVENT_EXT_DISC:
disc = &event->ext_disc;
addr = disc->addr.val;
ESP_LOGI(TAG, "[Disc advertiser] addr %02x:%02x:%02x:%02x:%02x:%02x, props: 0x%x, rssi:%d",
addr[5], addr[4], addr[3], addr[2], addr[1], addr[0], disc->props, disc->rssi);
if (synced) {
return 0;
}
rc = ble_hs_adv_parse_fields(&fields, disc->data, disc->length_data);
if (rc != 0) {
ESP_LOGE(TAG, "Failed to parse adv data, rc = %d", rc);
return 0;
}
if (disc->periodic_adv_itvl && fields.name_len && !memcmp(fields.name, TARGET_NAME, strlen(TARGET_NAME))) {
create_periodic_sync(disc);
}
return 0;
case BLE_GAP_EVENT_PERIODIC_REPORT:
ESP_LOGI(TAG, "[Periodic Adv Report] handle:%d, event_counter(%d), subevent(%d)",
event->periodic_report.sync_handle,
event->periodic_report.event_counter,
event->periodic_report.subevent);
rsp_slot_idx += 1;
struct ble_gap_periodic_adv_response_params param = {
.request_event = event->periodic_report.event_counter,
.request_subevent = event->periodic_report.subevent,
.response_subevent = event->periodic_report.subevent,
.response_slot = rsp_slot_idx,
};
struct os_mbuf *data = os_msys_get_pkthdr(BLE_PAWR_RSP_DATA_LEN, 0);
if (!data) {
ESP_LOGE(TAG, "No memory");
return 0;
}
// create a special data for checking manually in ADV side
sub_data_pattern[0] = event->periodic_report.data[0];
memset(sub_data_pattern + 1, event->periodic_report.subevent, BLE_PAWR_RSP_DATA_LEN - 1);
os_mbuf_append(data, sub_data_pattern, BLE_PAWR_RSP_DATA_LEN);
rc = ble_gap_periodic_adv_set_response_data(event->periodic_report.sync_handle, ¶m, data);
if (rc) {
ESP_LOGE(TAG, "Set response data failed, sync handle: %d, subev(%x), rsp_slot(%d), rc(0x%x)",
event->periodic_report.sync_handle, param.response_subevent, param.response_slot, rc);
}
else{
ESP_LOGI(TAG, "[RSP Data Set] sync handle: %d, subev(%x), rsp_slot(%d), rc(0x%x)",
event->periodic_report.sync_handle, param.response_subevent, param.response_slot, rc);
}
os_mbuf_free_chain(data);
return 0;
case BLE_GAP_EVENT_PERIODIC_SYNC_LOST:
ESP_LOGE(TAG, "[Periodic Sync Lost] handle:%d, Reason = 0x%x",
event->periodic_sync_lost.sync_handle, event->periodic_sync_lost.reason);
synced = false;
start_scan();
return 0;
case BLE_GAP_EVENT_PERIODIC_SYNC:
if (!event->periodic_sync.status) {
ESP_LOGI(TAG, "[Periodic Sync Established] sync handle:%d, num_subevents:0x%x",
event->periodic_sync.sync_handle, event->periodic_sync.num_subevents);
ESP_LOGI(TAG, "subevent_interval:0x%x, slot_delay:0x%x,slot_spacing:0x%x",
event->periodic_sync.subevent_interval,
event->periodic_sync.response_slot_delay,
event->periodic_sync.response_slot_spacing);
ble_gap_disc_cancel();
// choose subevents in range 0 to (num_subevents - 1)
uint8_t subevents[] = {0, 1, 2, 3, 4};
int result = ble_gap_periodic_adv_sync_subev(event->periodic_sync.sync_handle, 0, sizeof(subevents), subevents);
if (result == ESP_OK) {
ESP_LOGI(TAG, "[Subevent Sync OK] sync handle:%d, sync_subevents:%d", event->periodic_sync.sync_handle, sizeof(subevents));
} else {
ESP_LOGE(TAG, "Failed to sync subevents, rc = 0x%x", result);
}
} else {
ESP_LOGE(TAG, "Periodic Sync Error, status = %d", event->periodic_sync.status);
synced = false;
start_scan();
}
return 0;
default:
return 0;
}
}
static int
create_periodic_sync(struct ble_gap_ext_disc_desc *disc)
{
int rc;
struct ble_gap_periodic_sync_params params;
params.skip = 0;
params.sync_timeout = 4000;
params.reports_disabled = 0;
#if CONFIG_EXAMPLE_PERIODIC_ADV_ENH
/* This way the periodic advertising reports will not be
delivered to host unless the advertising data is changed
or the Data-Id is updated by the advertiser */
params.filter_duplicates = 1;
#endif
rc = ble_gap_periodic_adv_sync_create(&disc->addr, disc->sid, ¶ms, gap_event_cb, NULL);
if (!rc) {
synced = true;
ESP_LOGI(TAG, "Create sync");
} else {
ESP_LOGE(TAG, "Failed to create sync, rc = %d", rc);
}
return rc;
}
static void
start_scan(void)
{
int rc;
struct ble_gap_ext_disc_params disc_params;
/* Perform a passive scan. I.e., don't send follow-up scan requests to
* each advertiser.
*/
disc_params.itvl = BLE_GAP_SCAN_ITVL_MS(600);
disc_params.window = BLE_GAP_SCAN_ITVL_MS(300);
disc_params.passive = 1;
/* Tell the controller to filter duplicates; we don't want to process
* repeated advertisements from the same device.
*/
rc = ble_gap_ext_disc(BLE_OWN_ADDR_PUBLIC, 0, 0, 1, 0, 0, NULL, &disc_params,
gap_event_cb, NULL);
if (rc != 0) {
ESP_LOGE(TAG, "Error initiating GAP discovery procedure; rc=%d\n", rc);
}
}
static void
on_reset(int reason)
{
ESP_LOGE(TAG, "Resetting state; reason=%d\n", reason);
}
/* Cnnot find `ble_single_xxxx()`, workaround */
// static void
// on_sync(void)
// {
// int ble_single_env_init(void);
// int ble_single_init(void);
// int rc;
// rc = ble_single_env_init();
// assert(!rc);
// rc = ble_single_init();
// assert(!rc);
// start_scan();
// }
static void
on_sync(void)
{
int rc;
/* Make sure we have proper identity address set (public preferred) */
rc = ble_hs_util_ensure_addr(0);
assert(rc == 0);
start_scan();
}
void pawr_host_task(void *param)
{
ESP_LOGI(TAG, "BLE Host Task Started");
/* This function will return only when nimble_port_stop() is executed */
nimble_port_run();
nimble_port_freertos_deinit();
}
void
app_main(void)
{
esp_err_t ret;
/* Initialize NVS — it is used to store PHY calibration data */
ret = nvs_flash_init();
if (ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND) {
ESP_ERROR_CHECK(nvs_flash_erase());
ret = nvs_flash_init();
}
ESP_ERROR_CHECK(ret);
ret = nimble_port_init();
if (ret != ESP_OK) {
ESP_LOGE(TAG, "Failed to init nimble %d ", ret);
return;
}
/* Initialize the NimBLE host configuration. */
ble_hs_cfg.reset_cb = on_reset;
ble_hs_cfg.sync_cb = on_sync;
nimble_port_freertos_init(pawr_host_task);
}
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