Problem with MQTT connection

SARA AFF
1

Using the sodaq sara aff r412m (updated to the latest firmware) and trying the mqtt sketch (modified and adding r4x.mqttSetAuth) I noticed that with some services (example cloudmqtt) it works and with others instead (allthingstalk, ubitodots, cayenne) because they have set a username greater than 30 characters which is the limit of the field (both for username and password)

if (isReady) {
    isReady = r4x.mqttSetServer(MQTT_SERVER_NAME, MQTT_SERVER_PORT) && r4x.mqttSetAuth(MQTT_SERVER_Username, MQTT_SERVER_password) && r4x.mqttLogin();
    CONSOLE_STREAM.println(isReady ? "MQTT connected" : "MQTT failed");
}

how can I fix it?

2

Hi @scidox,

Thanks for letting us know.
We will investigate and fix the issue.

Best regards,
Jan

3

Hi scidox,

The latest firmware for the R412 is the M01.10 A02.14

Unfortunately, the 30 character limit is a restriction Ublox have set in their firmware. This can only be changed if they release new firmware with a fix for this.

We have also run into a number of problems with the built in MQTT stack on the R412. I would recommend that you look for a MQTT library that works directly over a TCP socket.

1 Like
4

the problem is only the login at the cloud service, the library where it connects works perfectly, transmits data quickly and easily and publishes everything with mqttPublish

5

We also had an issue where the login would fail when connect over 2G (URAT=9).
It would not work if the PDP context was already active.

6

Hi scidox,

We have now released an adapter library for Sodaq_MQTT to work with the Sodaq_R4X library.
You will need all three libraries:

This uses a direct MQTT implementation over TCP sockets. The main limitation at this point is the size of the topic payloads which are currently limited to 127 bytes.

1 Like
7

Thanks for the information, I will consider this implementation for the next projects.
I solved using cloudmqtt which sets username and password <30 characters and then I realized all the graphical interface (which would have given me the other online services ready) with node-red.

8

Hi

Do you have an example to connect Amazon AWS? I have tried that with SARA R412M, but no luck so far.

9

I don’t think we have an example for that. The main difference is that there are additional provisioning and configuration steps required in order to setup a secure TCP connection.