pass real wii remotes through emulated bluetooth

runtime/include/bluetooth/bt_bytes.h

@@ -0,0 +1,19 @@
+#pragma once
+
+// HCI and L2CAP fields are little-endian.
+
+#include <cstdint>
+#include <vector>
+
+namespace Bluetooth {
+
+inline uint16_t Le16(const uint8_t* p) {
+    return static_cast<uint16_t>(p[0] | (p[1] << 8));
+}
+
+inline void PutLe16(std::vector<uint8_t>& out, uint16_t v) {
+    out.push_back(static_cast<uint8_t>(v));
+    out.push_back(static_cast<uint8_t>(v >> 8));
+}
+
+} // namespace Bluetooth