Repo created

libs/platform/battery_tracker.hpp

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+#pragma once
+
+#include <chrono>
+#include <cstdint>
+#include <vector>
+
+namespace platform
+{
+// Note: this class is NOT thread-safe.
+class BatteryLevelTracker
+{
+public:
+  class Subscriber
+  {
+  public:
+    virtual void OnBatteryLevelReceived(uint8_t level) = 0;
+
+  protected:
+    virtual ~Subscriber() = default;
+  };
+
+  void Subscribe(Subscriber * subscriber);
+  void Unsubscribe(Subscriber * subscriber);
+  void UnsubscribeAll();
+
+private:
+  void RequestBatteryLevel();
+
+  std::vector<Subscriber *> m_subscribers;
+  std::chrono::system_clock::time_point m_lastRequestTime;
+  uint8_t m_lastReceivedLevel = 0;
+  bool m_isTrackingInProgress = false;
+};
+}  // namespace platform