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  • Case ID: 324937
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NRF9160 LTE connect error message

Frog

Hi,

  I'm experiencing an intermittent problem where nRF9160 devices aren't able to establish an LTE connection.  Recently our SIM provider made a configuration change that caused a number of devices to have their connections dropped, and several of them were not able to re-establish a connection for a number of days.  Many of these devices are in the field, but I was able to examine one of them and found that this message was output as the device tried to open a CAT-M1 connection:

<dbg> lte_lc_helpers: parse_cereg: LTE mode not found, error code: -22

I'm working through this with our SIM provider and would like to know if you're able to say what would cause this message to be generated?

Modem firmware is 1.3.5 and the application code is built with SDK 2.4.2.

Thanks,

  Frog

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  • 0 in reply to Michal

    Hi Michal,

      There's been little progress; nearly all of the devices in the field did come back online within a few days.  I have a couple of devices that still won't connect, and have found some peculiar issues where a specific combination of 9160 and SIM won't connect.  I'm not sure what I could to beyond trying to trace out the comms between the SIM and modem, unless there's a way to get the modem to output some detailed diagnostics.

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