Let us start here, from square one. No, from Zero!

acioemu/acioemu.h

@@ -0,0 +1,32 @@
+#pragma once
+
+#include <cstdint>
+#include <vector>
+
+#include "util/circular_buffer.h"
+
+#include "device.h"
+#include "icca.h"
+
+namespace acioemu {
+
+    class ACIOEmu {
+    private:
+        std::vector<ACIODeviceEmu *> *devices;
+        circular_buffer<uint8_t> *response_buffer;
+        circular_buffer<uint8_t> *read_buffer;
+        bool invert = false;
+
+        void msg_parse();
+
+    public:
+
+        explicit ACIOEmu();
+        ~ACIOEmu();
+
+        void add_device(ACIODeviceEmu *device);
+
+        void write(uint8_t byte);
+        std::optional<uint8_t> read();
+    };
+}