init: initial commit

2026-05-13 14:44:38 +02:00
commit 3fc50e797d
26 changed files with 4845 additions and 0 deletions
@@ -0,0 +1,89 @@
+#include "ble_scanner.h"
+#include "esp_bt.h"
+#include "esp_bt_main.h"
+#include "esp_gap_ble_api.h"
+#include "esp_log.h"
+#include <stdio.h>
+#include <string.h>
+
+#define TAG "ble_scanner"
+
+static ble_scanner_cb_t s_cb = NULL;
+
+/* Passive scan: 100ms interval, 50ms window (50% duty cycle) */
+static esp_ble_scan_params_t s_scan_params = {
+    .scan_type          = BLE_SCAN_TYPE_PASSIVE,
+    .own_addr_type      = BLE_ADDR_TYPE_PUBLIC,
+    .scan_filter_policy = BLE_SCAN_FILTER_ALLOW_ALL,
+    .scan_interval      = 0xA0,  /* 100ms: 0xA0 * 0.625ms */
+    .scan_window        = 0x50,  /* 50ms:  0x50 * 0.625ms */
+    .scan_duplicate     = BLE_SCAN_DUPLICATE_DISABLE,
+};
+
+static void gap_event_handler(esp_gap_ble_cb_event_t event,
+                               esp_ble_gap_cb_param_t *param)
+{
+    switch (event) {
+    case ESP_GAP_BLE_SCAN_PARAM_SET_COMPLETE_EVT:
+        if (param->scan_param_cmpl.status == ESP_BT_STATUS_SUCCESS) {
+            esp_ble_gap_start_scanning(0);  /* 0 = scan indefinitely */
+        } else {
+            ESP_LOGE(TAG, "Scan param set failed: %d", param->scan_param_cmpl.status);
+        }
+        break;
+
+    case ESP_GAP_BLE_SCAN_START_COMPLETE_EVT:
+        if (param->scan_start_cmpl.status != ESP_BT_STATUS_SUCCESS) {
+            ESP_LOGE(TAG, "Scan start failed: %d", param->scan_start_cmpl.status);
+        }
+        break;
+
+    case ESP_GAP_BLE_SCAN_RESULT_EVT: {
+        esp_ble_gap_cb_param_t *p = param;
+        if (p->scan_rst.search_evt == ESP_GAP_SEARCH_INQ_RES_EVT && s_cb) {
+            char tag_id[18];
+            uint8_t *a = p->scan_rst.bda;
+            snprintf(tag_id, sizeof(tag_id),
+                     "%02x:%02x:%02x:%02x:%02x:%02x",
+                     a[0], a[1], a[2], a[3], a[4], a[5]);
+            s_cb(tag_id, p->scan_rst.rssi);
+        }
+        break;
+    }
+
+    case ESP_GAP_BLE_SCAN_STOP_COMPLETE_EVT:
+        ESP_LOGI(TAG, "Scan stopped");
+        break;
+
+    default:
+        break;
+    }
+}
+
+void ble_scanner_init(ble_scanner_cb_t cb)
+{
+    s_cb = cb;
+
+    ESP_ERROR_CHECK(esp_bt_controller_mem_release(ESP_BT_MODE_CLASSIC_BT));
+
+    esp_bt_controller_config_t bt_cfg = BT_CONTROLLER_INIT_CONFIG_DEFAULT();
+    ESP_ERROR_CHECK(esp_bt_controller_init(&bt_cfg));
+    ESP_ERROR_CHECK(esp_bt_controller_enable(ESP_BT_MODE_BLE));
+    ESP_ERROR_CHECK(esp_bluedroid_init());
+    ESP_ERROR_CHECK(esp_bluedroid_enable());
+
+    ESP_ERROR_CHECK(esp_ble_gap_register_callback(gap_event_handler));
+    ESP_LOGI(TAG, "BLE scanner initialised");
+}
+
+void ble_scanner_start(void)
+{
+    ESP_LOGI(TAG, "Starting BLE scan");
+    ESP_ERROR_CHECK(esp_ble_gap_set_scan_params(&s_scan_params));
+    /* Scanning begins in the param-set callback once confirmed */
+}
+
+void ble_scanner_stop(void)
+{
+    esp_ble_gap_stop_scanning();
+}