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AGPS startup via NB-IoT on nrf9160-DK

paul_tanner

I took the APGS example and switched in to NB-IoT as I can't easily test with LTE/M at the moment

2021-03-15T16:25:39.226Z DEBUG modem << I: A-GPS sample has started
2021-03-15T16:25:39.246Z DEBUG modem << I: Connecting to LTE network. This may take minutes.
2021-03-15T16:25:39.249Z DEBUG modem << I: PSM mode requested
2021-03-15T16:25:42.194Z DEBUG modem << +CEREG: 2,"1BE8","00334D15",9,0,0,"11100000","11100000"
2021-03-15T16:25:42.900Z DEBUG modem << +CSCON: 1
2021-03-15T16:25:45.571Z DEBUG modem << +CEREG: 5,"1BE8","00334D15",9,,,"00000010","00011111"
2021-03-15T16:25:45.605Z DEBUG modem << I: Connected to LTE network
2021-03-15T16:25:45.606Z DEBUG modem << D: MAGPIO set: AT%XMAGPIO=1,0,0,1,1,1565,1586
2021-03-15T16:25:45.607Z DEBUG modem << D: COEX0 set: AT%XCOEX0=1,1,1565,1586
2021-03-15T16:25:45.610Z DEBUG modem << D: GPS socket created, fd: 1232491587
2021-03-15T16:25:45.611Z DEBUG modem << I: CLOUD_EVT_CONNECTING
2021-03-15T16:25:46.400Z DEBUG modem << I: CLOUD_EVT_CONNECTING

I tried this a few times and waiting several minutes in each case.  No more output seen.
Are there other things I need to change? apart from:

#CONFIG_LTE_NETWORK_MODE_LTE_M_GPS=y
CONFIG_LTE_NETWORK_MODE_NBIOT_GPS=y

Suggestions welcome.  Thx.
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  • 0

    Hello, 

    Sorry for the delayed answer. I will have a look at your case and get back to you before end of the day.

    Kind regards,
    Øyvind

  • 0 in reply to paul_tanner
    paul_tanner said:
    That will take a couple of days as I do not have NB-IoT coverage here.

     Then how are you supposed to connect to cloud if there is no coverage? Do you have LTE-M connection?

  • 0 in reply to Øyvind

    I mean a couple of days to find time to get near a cell tower that supports it.  Both NB-IoT and LTE/M have patchy coverage in the UK.  Our hope is that when development is complete coverage will be better.

    Then i found I had some time today.  I did 2 successful tests with another app that uses NB-IoT.  In between I did 2 tests with the AGPS sample.  The results were the same and I waited at least 10 minutes in each case

    2021-03-23T15:43:16.323Z DEBUG modem << I: A-GPS sample has started
2021-03-23T15:43:16.352Z DEBUG modem << I: Connecting to LTE network. This may take minutes.
2021-03-23T15:43:16.355Z DEBUG modem << I: PSM mode requested
2021-03-23T15:43:18.491Z DEBUG modem << +CEREG: 2,"1BE8","00334D15",9,0,0,"11100000","11100000"
2021-03-23T15:43:18.881Z DEBUG modem << +CSCON: 1
2021-03-23T15:43:20.102Z DEBUG modem << +CEREG: 5,"1BE8","00334D15",9,,,"00000010","00011111"
2021-03-23T15:43:20.114Z DEBUG modem << I: Connected to LTE network
2021-03-23T15:43:20.134Z DEBUG modem << D: MAGPIO set: AT%XMAGPIO=1,0,0,1,1,1565,1586
2021-03-23T15:43:20.137Z DEBUG modem << D: COEX0 set: AT%XCOEX0=1,1,1565,1586
2021-03-23T15:43:20.138Z DEBUG modem << D: GPS socket created, fd: 1232491587
2021-03-23T15:43:20.139Z DEBUG modem << I: CLOUD_EVT_CONNECTING
2021-03-23T15:43:20.386Z DEBUG modem << I: CLOUD_EVT_CONNECTING
2021-03-23T15:43:25.478Z DEBUG modem << +CSCON: 0

    So the only changes from the supplied sample were:

    #CONFIG_LTE_NETWORK_MODE_LTE_M_GPS=y
    CONFIG_LTE_NETWORK_MODE_NBIOT_GPS=y

    I wonder if there are other things needed when NB-IoT is used.  If there was a connection problem I would expect some kind of timeout message.  Instead it seems to be just hanging.

  • 0 in reply to paul_tanner

    Hello, 

    My apologies for the blunt answer yesterday. I contacted the RSM for the UK to get a better overview of the network situation, and this is her response:

    The UK have LTE-m coverage in the EAST, via O2 (Telefonica). Customers can check the coverage in their area using this website: https://www.o2.co.uk/business/solutions/iot/lte-m

    Please note that the last time I checked the low-power modes (eDRX and PSM) were not available to roaming SIMs (like iBasis) so he would need a SIM from O2 (with a data allowance) to get the GPS demo on the Thingy:91 working.

    Should he wish to try NB-IoT, then this is also possible where he lives, however he will need to get specific SIM cards that are enabled for NB-IoT. I would advise contacting Arkessa for these as they are a preferred partner of Vodfone, however the SIMs that Arkessa supply in their trial pack are NOT whitelisted – which makes development a whole lot easier especially when using AWS!

    If you are interested in getting a trial package from Arkessa, please let me know and I will forward the contact information.

    NB-IoT coverage is ALMOST the whole of the country (with notable exceptions like East Anglia), and the density of coverage should be improving.

    Please let me know if you have any further questions on this.

    Are you using the iBasis SIM for testing or do you use another SIM from one of the network providers? 

    Kind regards,
    Øyvind

  • 0 in reply to Øyvind

    I'm using NB-IoT SIMs from Vodafone.  I also have an iBasis LTE/M SIM but had similar coverage issues with that.  I know that at this stage of UK rollouts we have to travel a little to get in range.  However, we have plenty of development work yet to do before we'll be ready to deploy.

    So the question remains: why does the AGPS example stall?  Is some further customisation needed to enable the necessary cloud connection?

    I see that nrfCloud can generate a device certificate.  No mention of that in the README but I wondered if that could be required in the build?

  • 0 in reply to paul_tanner
    paul_tanner said:
    why does the AGPS example stall?  Is some further customisation needed to enable the necessary cloud connection?

     No, there shouldn't be any other customisations needed to enable anything. What I am afraid of is the NB-IoT connection. Are you able to try with a new SIM from Arkessa? https://www.arkessa.com/

    If that does not help, can you please try running the Asset Tracker sample to see if that is able to connect nRF Cloud?

    Thank you.
    -Øyvind

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