gistfile1.txt

        case MAVLINK_MSG_ID_PARAM_REQUEST_LIST: {
            mavlink_param_request_list_t request;
            mavlink_msg_param_request_list_decode(&msg, &request);

            /* this is how you would load a setting for the component when
             * replying to a settings request
             */
            QSettings settings;
            settings.beginGroup("OpenHDCamera");

            auto keys = settings.allKeys();
            auto param_count = keys.count();

            auto len = 0;
            auto sent = 0;
            auto written = 0;
            uint8_t buffer[MAVLINK_MAX_PACKET_LEN];

            QStringList::const_iterator i = keys.constBegin();
            while (i != keys.constEnd()) {
                auto key = *i;
                auto value = settings.value(key);

                mavlink_message_t outgoing_msg;
                mavlink_msg_param_value_pack(OPENHD_AIR_SYSID, MAV_COMP_ID_CAMERA, &outgoing_msg, key.toUtf8(), value.toFloat(), MAV_PARAM_TYPE_UINT8, param_count, sent);
                len = mavlink_msg_to_send_buffer(buffer, &outgoing_msg);
                written = socket->write((char*)buffer, len);
                socket->flush();

                sent += 1;
                ++i;
            }

            break;
        }