Fist commit

src/platform/EspMonotonicClock.h

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+#pragma once
+
+#include <esp_timer.h>
+
+#include <cstdint>
+
+namespace timbre {
+
+class EspMonotonicClock {
+ public:
+  std::uint64_t micros() const { return static_cast<std::uint64_t>(esp_timer_get_time()); }
+  std::uint32_t milliseconds() const {
+    return static_cast<std::uint32_t>(micros() / 1000ULL);
+  }
+};
+
+}  // namespace timbre