• cmd_buf_size : mptl::terminal< Tp, _terminal_echo >
• cmd_maxlen : mptl::terminal_hook_list< T, Args... >
• newline : mptl::terminal< Tp, _terminal_echo >
• prompt : mptl::terminal< Tp, _terminal_echo >
• terminal_echo : mptl::terminal< Tp, _terminal_echo >
• tx_stream : mptl::terminal< Tp, _terminal_echo >