nRF9160 MQTT connection failure

[khodidas]

Hi,

We are using nRF9160 ncs version 1.0.0. 

I have two queries.

We are making connection with AWS server. In the backend we have telenor server. 

We make MQTT connection, publish data and disconnect from server.

Connection interval is 5 minutes. 

We have observed that after 7-8 hours of successful connection (more than 100 times ) it gets stuck in

"connect" function inside "mqtt_client_tls_connect" function. It never comes out of "connect" function. 

Second query is we are using "lte_lc_psm_req" function to put the device in PSM mode to save power.

During first MQTT connection with AWS server device takes more than 10 minutes ( There are multiple failures in MQTT connection during this time )

Initially we get error -111 and then we get error -60. 

After 10 to 15 minutes, connection with  server is established and thereafter we don't have any issue in connection.

Can you help me in resolving this issue ?

Regards,

Smitesh Mali

[Simonr]

Hi Smitesh

We've looked at your modem trace, and can't seem to find anything out of the ordinary. It seems the modem trace ends while the system is still connected, and it does not seem stuck in any way. However, our experts are looking into it, and hopefully, they'll be able to provide an answer over the weekend. I'll update you as soon as I know something!

Best regards,

Simon