Function packet_modify

less_slow.cpp:6671–6675

* @brief Emulates some message processing logic, that will update the `input` packet * and write the result to the `output` buffer, returning the output length. * * This function will be called on the server size to reply each message. * It is also called on the client side to validate the received response. */

 *  It is also called on the client side to validate the received response.
 */
std::size_t packet_modify(char const *input, std::size_t input_length, char *output) {
    // Echo the input packet back. Any wiser suggestions?
    std::memcpy(output, input, input_length);
    return input_length;
}

#pragma region POSIX