String Representation of SubAckReasonCode

[elryno]

I would like to log a human-readable string for a Aws::Crt::Mqtt5::SubAckReasonCode. There doesn't seem to be an available function that does this. I did find aws_mqtt5_suback_reason_code_to_c_string. However, it is only declared in a private header file. Is there any way to get a string for the reason code from aws-crt-cpp?

Here is the code I am currently using to subscribe to a topic.

    bool subscribe_to_topic(const std::string &topic)
    {
        Aws::Crt::Mqtt5::Subscription subscription(Aws::Crt::String(topic.c_str()), Aws::Crt::Mqtt5::QOS::AWS_MQTT5_QOS_AT_LEAST_ONCE);
        std::shared_ptr<Aws::Crt::Mqtt5::SubscribePacket> subscribe_packet = std::make_shared<Aws::Crt::Mqtt5::SubscribePacket>();
        subscribe_packet->WithSubscription(std::move(subscription));

        bool result = m_mqtt_client->Subscribe(
            subscribe_packet, [this, topic](int io_error, std::shared_ptr<Aws::Crt::Mqtt5::SubAckPacket> suback) {
                log_debug("Received SUBACK response: %d", io_error);
                if (io_error != AWS_OP_SUCCESS) {
                    log_error("Subscription to %s failed: %s", topic.c_str(), Aws::Crt::ErrorDebugString(io_error));
                    return;
                }

                if (suback != nullptr) {
                    for (auto reason_code : suback->getReasonCodes()) {
                        log_debug("SUBACK reason_code: %d", reason_code);
                        if (reason_code > Aws::Crt::Mqtt5::SubAckReasonCode::AWS_MQTT5_SARC_UNSPECIFIED_ERROR) {
                            auto &reason_str = suback->getReasonString();
                            log_error("Subscription to %s failed with server error: %s", topic.c_str(),
                                            reason_str.has_value() ? reason_str->c_str() : std::to_string(reason_code).c_str());
                            return;
                        }
                    }
                }

                log_info("Successfully published %s subscription request", topic.c_str());

                // Safely send message to main thread
                m_aws_iot_thread_channel->send_to_main_thread(msg_type::subscribed, "SUBACK", topic);
            });

        if (!result) {
            log_error("Failed to queue %s subscription request", topic.c_str());
            return false;
        }

        return true;
    }

[bretambrose]

No, we don't expose any reason-code-to-string conversion functions anywhere.

[elryno]

What is the status of this? (i.e not desired, desired but not prioritized, or planned)

Thanks!

[bretambrose]

No plans/desire atm