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50 lines
1.6 KiB
C++
50 lines
1.6 KiB
C++
#include "exposure_notifications.h"
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#include "esphome/core/log.h"
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#include "esphome/core/helpers.h"
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#ifdef ARDUINO_ARCH_ESP32
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namespace esphome {
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namespace exposure_notifications {
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using namespace esp32_ble_tracker;
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static const char *const TAG = "exposure_notifications";
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bool ExposureNotificationTrigger::parse_device(const ESPBTDevice &device) {
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// See also https://blog.google/documents/70/Exposure_Notification_-_Bluetooth_Specification_v1.2.2.pdf
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if (device.get_service_uuids().size() != 1)
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return false;
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// Exposure notifications have Service UUID FD 6F
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ESPBTUUID uuid = device.get_service_uuids()[0];
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// constant service identifier
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const ESPBTUUID expected_uuid = ESPBTUUID::from_uint16(0xFD6F);
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if (uuid != expected_uuid)
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return false;
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if (device.get_service_datas().size() != 1)
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return false;
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// The service data should be 20 bytes
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// First 16 bytes are the rolling proximity identifier (RPI)
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// Then 4 bytes of encrypted metadata follow which can be used to get the transmit power level.
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ServiceData service_data = device.get_service_datas()[0];
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if (service_data.uuid != expected_uuid)
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return false;
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auto data = service_data.data;
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if (data.size() != 20)
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return false;
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ExposureNotification notification{};
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memcpy(¬ification.address[0], device.address(), 6);
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memcpy(¬ification.rolling_proximity_identifier[0], &data[0], 16);
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memcpy(¬ification.associated_encrypted_metadata[0], &data[16], 4);
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notification.rssi = device.get_rssi();
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this->trigger(notification);
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return true;
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}
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} // namespace exposure_notifications
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} // namespace esphome
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#endif
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