268 lines
8.3 KiB
C++
268 lines
8.3 KiB
C++
/* code snippets taken from
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https://github.com/nkolban/esp32-snippets/tree/master/BLE/scanner
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*/
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#include "blescan.h"
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#define BT_BD_ADDR_HEX(addr) \
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addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]
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// local Tag for logging
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static const char TAG[] = "bluetooth";
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const char *bt_addr_t_to_string(esp_ble_addr_type_t type) {
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switch (type) {
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case BLE_ADDR_TYPE_PUBLIC:
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return "BLE_ADDR_TYPE_PUBLIC";
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case BLE_ADDR_TYPE_RANDOM:
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return "BLE_ADDR_TYPE_RANDOM";
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case BLE_ADDR_TYPE_RPA_PUBLIC:
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return "BLE_ADDR_TYPE_RPA_PUBLIC";
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case BLE_ADDR_TYPE_RPA_RANDOM:
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return "BLE_ADDR_TYPE_RPA_RANDOM";
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default:
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return "Unknown addr_t";
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}
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} // bt_addr_t_to_string
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const char *btsig_gap_type(uint32_t gap_type) {
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switch (gap_type) {
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case 0x01:
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return "Flags";
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case 0x02:
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return "Incomplete List of 16-bit Service Class UUIDs";
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case 0x03:
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return "Complete List of 16-bit Service Class UUIDs";
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case 0x04:
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return "Incomplete List of 32-bit Service Class UUIDs";
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case 0x05:
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return "Complete List of 32-bit Service Class UUIDs";
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case 0x06:
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return "Incomplete List of 128-bit Service Class UUIDs";
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case 0x07:
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return "Complete List of 128-bit Service Class UUIDs";
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case 0x08:
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return "Shortened Local Name";
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case 0x09:
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return "Complete Local Name";
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case 0x0A:
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return "Tx Power Level";
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case 0x0D:
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return "Class of Device";
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case 0x0E:
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return "Simple Pairing Hash C/C-192";
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case 0x0F:
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return "Simple Pairing Randomizer R/R-192";
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case 0x10:
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return "Device ID/Security Manager TK Value";
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case 0x11:
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return "Security Manager Out of Band Flags";
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case 0x12:
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return "Slave Connection Interval Range";
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case 0x14:
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return "List of 16-bit Service Solicitation UUIDs";
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case 0x1F:
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return "List of 32-bit Service Solicitation UUIDs";
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case 0x15:
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return "List of 128-bit Service Solicitation UUIDs";
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case 0x16:
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return "Service Data - 16-bit UUID";
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case 0x20:
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return "Service Data - 32-bit UUID";
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case 0x21:
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return "Service Data - 128-bit UUID";
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case 0x22:
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return "LE Secure Connections Confirmation Value";
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case 0x23:
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return "LE Secure Connections Random Value";
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case 0x24:
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return "URI";
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case 0x25:
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return "Indoor Positioning";
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case 0x26:
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return "Transport Discovery Data";
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case 0x17:
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return "Public Target Address";
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case 0x18:
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return "Random Target Address";
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case 0x19:
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return "Appearance";
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case 0x1A:
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return "Advertising Interval";
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case 0x1B:
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return "LE Bluetooth Device Address";
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case 0x1C:
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return "LE Role";
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case 0x1D:
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return "Simple Pairing Hash C-256";
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case 0x1E:
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return "Simple Pairing Randomizer R-256";
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case 0x3D:
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return "3D Information Data";
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case 0xFF:
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return "Manufacturer Specific Data";
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default:
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return "Unknown type";
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}
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} // btsig_gap_type
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// using IRAM_:ATTR here to speed up callback function
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IRAM_ATTR void gap_callback_handler(esp_gap_ble_cb_event_t event,
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esp_ble_gap_cb_param_t *param) {
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esp_ble_gap_cb_param_t *p = (esp_ble_gap_cb_param_t *)param;
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ESP_LOGV(TAG, "BT payload rcvd -> type: 0x%.2x -> %s", *p->scan_rst.ble_adv,
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btsig_gap_type(*p->scan_rst.ble_adv));
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switch (event) {
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case ESP_GAP_BLE_SCAN_PARAM_SET_COMPLETE_EVT:
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// restart scan
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ESP_ERROR_CHECK(esp_ble_gap_start_scanning(BLESCANTIME));
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break;
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case ESP_GAP_BLE_SCAN_RESULT_EVT:
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// evaluate scan results
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if (p->scan_rst.search_evt ==
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ESP_GAP_SEARCH_INQ_CMPL_EVT) // Inquiry complete, scan is done
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{ // restart scan
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ESP_ERROR_CHECK(esp_ble_gap_start_scanning(BLESCANTIME));
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return;
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}
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if (p->scan_rst.search_evt ==
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ESP_GAP_SEARCH_INQ_RES_EVT) // Inquiry result for a peer device
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{ // evaluate sniffed packet
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ESP_LOGV(TAG, "Device address (bda): %02x:%02x:%02x:%02x:%02x:%02x",
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BT_BD_ADDR_HEX(p->scan_rst.bda));
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ESP_LOGV(TAG, "Addr_type : %s",
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bt_addr_t_to_string(p->scan_rst.ble_addr_type));
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ESP_LOGV(TAG, "RSSI : %d", p->scan_rst.rssi);
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if ((cfg.rssilimit) &&
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(p->scan_rst.rssi < cfg.rssilimit)) { // rssi is negative value
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ESP_LOGI(TAG, "BLTH RSSI %d -> ignoring (limit: %d)", p->scan_rst.rssi,
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cfg.rssilimit);
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break;
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}
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#ifdef VENDORFILTER
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if ((p->scan_rst.ble_addr_type == BLE_ADDR_TYPE_RANDOM) ||
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(p->scan_rst.ble_addr_type == BLE_ADDR_TYPE_RPA_RANDOM)) {
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ESP_LOGV(TAG, "BT device filtered");
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break;
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}
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#endif
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// add this device and show new count total if it was not previously added
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mac_add((uint8_t *)p->scan_rst.bda, p->scan_rst.rssi, MAC_SNIFF_BLE);
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/* to be improved in vendorfilter if:
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// you can search for elements in the payload using the
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// function esp_ble_resolve_adv_data()
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//
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// Like this, that scans for the "Complete name" (looking inside the
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payload buffer)
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// uint8_t len;
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// uint8_t *data = esp_ble_resolve_adv_data(p->scan_rst.ble_adv,
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ESP_BLE_AD_TYPE_NAME_CMPL, &len);
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filter BLE devices using their advertisements to get filter alternative to
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vendor OUI if vendorfiltering is on, we ...
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- want to count: mobile phones and tablets
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- don't want to count: beacons, peripherals (earphones, headsets,
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printers), cars and machines see
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https://github.com/nkolban/ESP32_BLE_Arduino/blob/master/src/BLEAdvertisedDevice.cpp
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http://www.libelium.com/products/meshlium/smartphone-detection/
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https://www.question-defense.com/2013/01/12/bluetooth-cod-bluetooth-class-of-deviceclass-of-service-explained
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https://www.bluetooth.com/specifications/assigned-numbers/baseband
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"The Class of Device (CoD) in case of Bluetooth which allows us to
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differentiate the type of device (smartphone, handsfree, computer,
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LAN/network AP). With this parameter we can differentiate among
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pedestrians and vehicles."
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*/
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} // evaluate sniffed packet
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break;
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default:
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break;
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}
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} // gap_callback_handler
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esp_err_t register_ble_callback(void) {
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ESP_LOGI(TAG, "Register GAP callback");
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// This function is called to occur gap event, such as scan result.
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// register the scan callback function to the gap module
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ESP_ERROR_CHECK(esp_ble_gap_register_callback(&gap_callback_handler));
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static esp_ble_scan_params_t ble_scan_params = {
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.scan_type = BLE_SCAN_TYPE_PASSIVE,
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.own_addr_type = BLE_ADDR_TYPE_RANDOM,
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#ifdef VENDORFILTER
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.scan_filter_policy = BLE_SCAN_FILTER_ALLOW_WLIST_PRA_DIR,
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// ADV_IND, ADV_NONCONN_IND, ADV_SCAN_IND packets are used for broadcasting
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// data in broadcast applications (e.g., Beacons), so we don't want them in
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// vendorfilter mode
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#else
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.scan_filter_policy = BLE_SCAN_FILTER_ALLOW_ALL,
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#endif
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.scan_interval =
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(uint16_t)(cfg.blescantime * 10 / 0.625), // Time = N * 0.625 msec
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.scan_window = (uint16_t)(BLESCANWINDOW / 0.625) // Time = N * 0.625 msec
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};
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ESP_LOGI(TAG, "Set GAP scan parameters");
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// This function is called to set scan parameters.
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ESP_ERROR_CHECK(esp_ble_gap_set_scan_params(&ble_scan_params));
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return ESP_OK;
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} // register_ble_callback
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void start_BLEscan(void) {
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#ifdef BLECOUNTER
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ESP_LOGI(TAG, "Initializing bluetooth scanner ...");
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ESP_ERROR_CHECK(esp_coex_preference_set(
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(esp_coex_prefer_t)
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ESP_COEX_PREFER_BALANCE)); // configure Wifi/BT coexist lib
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// Initialize BT controller to allocate task and other resource.
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btStart();
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ESP_ERROR_CHECK(esp_bluedroid_init());
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ESP_ERROR_CHECK(esp_bluedroid_enable());
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// Register callback function for capturing bluetooth packets
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ESP_ERROR_CHECK(register_ble_callback());
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ESP_LOGI(TAG, "Bluetooth scanner started");
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#endif // BLECOUNTER
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} // start_BLEscan
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void stop_BLEscan(void) {
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#ifdef BLECOUNTER
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ESP_LOGI(TAG, "Shutting down bluetooth scanner ...");
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ESP_ERROR_CHECK(esp_ble_gap_register_callback(NULL));
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ESP_ERROR_CHECK(esp_bluedroid_disable());
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ESP_ERROR_CHECK(esp_bluedroid_deinit());
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btStop(); // disable bt_controller
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ESP_ERROR_CHECK(esp_coex_preference_set((
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esp_coex_prefer_t)ESP_COEX_PREFER_WIFI)); // configure Wifi/BT coexist lib
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ESP_LOGI(TAG, "Bluetooth scanner stopped");
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#endif // BLECOUNTER
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} // stop_BLEscan
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