Method send

tests/test_asio_transport.cpp:106–108

        asio::ip::tcp::socket& s;
        explicit ServerTransport(asio::ip::tcp::socket& sock) : s(sock) {}
        void send(std::span<const std::byte> d) override {
            asio::write(s, asio::buffer(d.data(), d.size()));
        }
        std::size_t receive(std::span<std::byte> dst) override {
            asio::error_code ec;
            const std::size_t n =