Add message IDs, transport interface, client package, extract protocol headers

include/protocol.h

@@ -0,0 +1,34 @@
+#pragma once
+#include <cstdint>
+#include <string>
+#include <tuple>
+#include <vector>
+
+struct ResponseBOOTSEL {
+    static constexpr int8_t ext_id = 1;
+    auto as_tuple() const { return std::tie(); }
+    auto as_tuple() { return std::tie(); }
+};
+
+struct RequestBOOTSEL {
+    static constexpr int8_t ext_id = 2;
+    auto as_tuple() const { return std::tie(); }
+    auto as_tuple() { return std::tie(); }
+};
+
+struct DeviceError {
+    static constexpr int8_t ext_id = 3;
+    uint32_t code;
+    std::string message;
+    auto as_tuple() const { return std::tie(code, message); }
+    auto as_tuple() { return std::tie(code, message); }
+};
+
+struct Envelope {
+    static constexpr int8_t ext_id = 0;
+    uint32_t message_id;
+    uint32_t checksum;
+    std::vector<uint8_t> payload;
+    auto as_tuple() const { return std::tie(message_id, checksum, payload); }
+    auto as_tuple() { return std::tie(message_id, checksum, payload); }
+};