More bluetooth medium code.

internal/platform/implementation/linux/bluetooth_pairing.h

@@ -0,0 +1,33 @@
+#ifndef PLATFORM_IMPL_LINUX_BLUETOOTH_PROFILE_H_
+#define PLATFORM_IMPL_LINUX_BLUETOOTH_PAIRING_H_
+
+#include <string>
+
+#include <systemd/sd-bus.h>
+
+#include "absl/strings/string_view.h"
+#include "internal/platform/implementation/bluetooth_classic.h"
+#include "internal/platform/logging.h"
+
+namespace nearby {
+namespace linux {
+class BluetoothPairing : public api::BluetoothPairing {
+public:
+  BluetoothPairing(absl::string_view object_path);
+  ~BluetoothPairing() { sd_bus_unref(system_bus_); }
+
+  bool InitiatePairing(api::BluetoothPairingCallback pairing_cb) override;
+  bool FinishPairing(std::optional<absl::string_view> pin_code) override;
+  bool CancelPairing() override;
+  bool Unpair() override;
+  bool IsPaired() override;
+
+private:
+  std::string object_path_;
+  sd_bus *system_bus_;
+  api::BluetoothPairingCallback pairing_cb_;
+};
+} // namespace linux
+} // namespace nearby
+
+#endif