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E
egoltzman
Visitor II
December 17, 2020
Question

P-L496-CELL02 development kit demonstration application problem

  • December 17, 2020
  • 1 reply
  • 766 views

Hello,

I'm using the  P-L496-CELL02 development kit and I'm running a POC in order to demonstrate a potential customer the performance and stability of the L496+Quectel+ST cellular library.

For that I created based on the X-CUBE-AWS 1.4.1 pack an MQTT application that preform a simple continues communication with AWS device shadow.

The demo application worked as expected with my local operator SIM and then I installed it on a remote location (in the US) where the target system should run.

I started to experience unexpected system restarts after 30 minutes of operation without any previously errors in the log (As this is located on a remote site I only have limited access to the device).

To remove any doubts regarding my test application I installed the "out of the box" demonstration binary from the X-CUBE-CELLULAR 5.1 (DiscoL496_RD_BG96v2_STMOD) and run it on the remote site, and I'm experience the same resets as on my test application.

On my local setup I see no problems and the only obvious difference is the cellular operator.

I can see that on the remote site the SIM is registered as a roamer and the network is EDGE GSM while on my local network the system is registered as CAT-M1 LTE.

Any idea what could be the problem or how I can identify the cause of it?

Thanks

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    1 reply

    R
    Ronan GABOU
    ST Employee
    December 17, 2020

    Hello,

    May be the network try to attach to Cat M after 30mn.

    First get information from the NMO (Cat M used bands and set bands in the modem to reduce selection time).

    For this the UM Getting started chap 5 could help you.

    Select only Cat M and the used bands of the NMO you have issue with.

    Let us know the result.

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