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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

  • 0

    Hi Smitesh

    I have a few questions to your setup:

    • What network are you connected to?
    • How often do you set the device in PSM mode?
    • Are you using the latest modem firmware as well (mfw version 1.0.0)?

    The behavior of your device indicates that the coverage might be bad in your location, and that's why it drops out. Error -111 usually indicates that something is wrong with the credentials/certification, and error -60 indicates a timeout.

    Best regards,

    Simon

  • 0 in reply to Simonr

    Hi,

    Simonr said:
    What network are you connected to?

    Telenor (Norway)

    Simonr said:
    How often do you set the device in PSM mode?

    Below are my PSM settings 

    # Requested Periodic TAU
    CONFIG_LTE_PSM_REQ_RPTAU="00000011"
    # Requested Active Time
    #CONFIG_LTE_PSM_REQ_RAT="00001010"
    CONFIG_LTE_PSM_REQ_RAT="00000001"

    Simonr said:
    Are you using the latest modem firmware as well (mfw version 1.0.0)?

    Yes

    Regards,

    Smitesh Mali

  • 0

    Hi

    Can you confirm that you're situated in India while connected to a Norwegian (Telenor) network?

    Keep in mind that the PSM mode intervals are requested by the nRF9160 to the network, it's not a certainty that the nRF9160 gets those intervals from the network. You can check if there is a difference in the PSM modes of your different providers by using the AT command AT+CPSMS?after activating PSM. (as stated in the AT Command documentation). It will return the parameters used.

    Best regards,

    Simon

  • 0 in reply to Simonr
    Simonr said:
    Can you confirm that you're situated in India while connected to a Norwegian (Telenor) network?

    Yes, you are right. 

    I will check PSM supported by network using "AT+CPSMS?"

  • 0 in reply to khodidas

    Hi,

    I got following reply from "AT+CPSMS?" at command. 

    CPSMS = +CPSMS: 1,,,"00000011","00000001"<CR>

    So the values are same as we requested.

    Some more information about our set up and observations 

     

    We have also made a PC client to behave in the same manor and this runs without any problems.

    We have also moved from one production environment ( At Telenor ) to another and problem still exists. 

    As I have mentioned in my very first thread , there are two issues 

    1. MQTT connection Failure after many successful connections 

    2. nRF9160 takes longer time in first connection if PSM mode is enabled. 

    I work for norwegian company and access the nRF9160 hardware using remote pc set up from 

    India. 

    Regards,

    Smitesh Mali

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