MQTT Connect -60 error

[Ayo001]

I've been trying to get the MQTT simple sample started however after changing the hostname to "mqtt.eclipse.org" and running the sample, it stops with this error. Please how do I fix this

[Nikunj]

Hi,

Are you using your own MQTT server or opensource server?

can you check the IP you gave is correct? or opensource server is available or not?

Regards,

Nikunj

[Ayo001]

I am using an opensource server, test.mosquitto.org

I have tested using MQTT.fx client and it connects to the same server 

I have also tested the address and it seems to be correct

[Jan Tore Guggedal]

Hi,

It looks like you are connecting to an NB-IoT network, is that correct?

Some NB-IoT networks only support UDP traffic. If that's the case here, it might explain why MQTT doesn't work, as it uses TCP as transport. 

If you have LTE-M coverage, you could try to switch over and see if that works. If not, you can try the coap_client sample in NCS, which runs on top of UDP, just to get a pointer to if it actually is a TCP vs UDP issue here.

Also, you can collect trace from the modem, following this tutorial, and attach them here for further analysis.

Best regards,

Jan Tore

[Ayo001]

Yes I am limited to only NB-IoT in my region, is there any other samples that run on top of UDP?