Add RequestInfo/ResponseInfo with MAC address

include/msgpackpp.h

@@ -1,5 +1,6 @@
 #pragma once
 #include <algorithm>
+#include <array>
 #include <cassert>
 #include <cstdint>
 #include <expected>
@@ -366,6 +367,9 @@ public:
 
   pack_result pack(const std::vector<uint8_t> &v) { return pack_bin(v); }
 
+  template <size_t N>
+  pack_result pack(const std::array<uint8_t, N> &v) { return pack_bin(v); }
+
   template <typename... Ts>
   pack_result pack(const std::tuple<Ts...> &t) {
     auto r = pack_array(sizeof...(Ts));
@@ -725,6 +729,15 @@ inline result<parser> unpack(const parser &p, std::string &out) {
   return p.next();
 }
 
+template <size_t N>
+result<parser> unpack(const parser &p, std::array<uint8_t, N> &out) {
+  auto v = p.get_binary_view();
+  if (!v) return std::unexpected(v.error());
+  if (v->size() != N) return std::unexpected(error_code::type_error);
+  std::copy(v->begin(), v->end(), out.begin());
+  return p.next();
+}
+
 inline result<parser> unpack(const parser &p, std::vector<uint8_t> &out) {
   auto v = p.get_binary_view();
   if (!v) return std::unexpected(v.error());

include/protocol.h

@@ -1,4 +1,5 @@
 #pragma once
+#include <array>
 #include <cstdint>
 #include <string>
 #include <tuple>
@@ -16,6 +17,19 @@ struct RequestPICOBOOT {
     auto as_tuple() { return std::tie(); }
 };
 
+struct RequestInfo {
+    static constexpr int8_t ext_id = 4;
+    auto as_tuple() const { return std::tie(); }
+    auto as_tuple() { return std::tie(); }
+};
+
+struct ResponseInfo {
+    static constexpr int8_t ext_id = 5;
+    std::array<uint8_t, 6> mac;
+    auto as_tuple() const { return std::tie(mac); }
+    auto as_tuple() { return std::tie(mac); }
+};
+
 struct DeviceError {
     static constexpr int8_t ext_id = 3;
     uint32_t code;