Fipy LTE Won't Attach



  • Hey everyone!

    I'm relatively new to Pycom and am currently developing some ADC -> I2C -> LTE-M devices on Fipy / Pybytes.

    I'm using Telia in Norway and have ordered 50 LTE-M/NB-IoT sims that I'm having issues with.

    Before ordering these SIMS I had been given a test LTE-M/NB-IoT sim that I'm having no issues with connecting using the https://docs.pycom.io/tutorials/networks/lte/ tutorial (works on Pybytes as well).

    If I try any of the 50 Sims from Telia we received I can't attach at all to the network and am now stuck wondering if it's me or something with my sims specifically.

    Any input how how to debug this further would be greatly appreciated!

    Here's some logs from the sim that does connect:

    >>> import sqnsupgrade
    >>> sqnsupgrade.info()
    <<< Welcome to the SQN3330 firmware updater [1.2.6] >>>
    >>> FiPy with firmware version 1.20.2.r1
    Your modem is in application mode. Here is the current version:
    UE5.0.0.0d
    LR5.1.1.0-47510
    
    Attaching...
    SYSTEM FSM
    ==========
        +--------------------------+--------------------+
        |            FSM           |        STATE       |
        +--------------------------+--------------------+
        | RRC TOP FSM              |SYNCING             |
        | RRC SEARCH FSM           |WAIT_SYNC           |
        | RRC ACTIVE FSM           |NULL                |
        | PMM PLMN FSM             |NORM_CAMPED         |
        | EMM MAIN FSM             |REGISTERED          |
        | EMM AUTH FSM             |KASME_DEFINED       |
        | EMM CONN FSM             |EMM_IDLE            |
        | EMM TAU FSM              |NULL                |
        | EMM TEST FSM             |NULL                |
        | ESM BEARER FSM           |BEARER_ACTIVE       |
        | SMS MT FSM               |IDLE                |
        | SMS MO FSM               |IDLE                |
        | HP MAIN FSM              |IDLE                |
        | HP USIM FSM              |READY               |
        | HP SMS MO FSM            |IDLE                |
        | HP SMS MT FSM            |IDLE                |
        | HP CAT FSM               |IDLE                |
        +--------------------------+--------------------+
    
    OK
    
    DL SYNCHRO STATISTICS
    =====================
        Synchro state                         : CELL_ACQUIRED
        PPU SIB1 ACQ watchdog                 : 0
        Frequency Hypothesis RF  (Hz)         : 0
        RSRP (dBm)                            : -85.71
        RSRQ  (dB)                            : -9.90
        Channel estimation state (Cell-spec.) : LOW CINR
        Channel estimation state (UE-spec.)   : LOW CINR
        Channel estimation state (MBSFN)      : LOW CINR
        Channel estimation CINR               : 5.05
        Channel length                        : SHORT
      AGC
        AGC RX gain (dB)                      : 44.78
        RX PSD BO (dBFs)                      : -20.81
        RX PSD (dBm)                          : -86.98
        Noise level RS (dBm)                  : -90.19
        Digital gain (dB)                     : 5.61
        CINR RS (dB)                          : 4.48
      NARROWBANDS
        Last DL NB                            : Central
        Last UL NB                            : N/A
      AFC
        Frequency offset RF  (Hz)             : -187
        Frequency offset BB  (Hz)             : 0
      PBCH
        MIB received quantity                 : 56
        MIB timeout quantity                  : 0
    
    OK
    ----
    

    And swapping the sims where it won't ever attach:

    SYSTEM FSM
    ==========
        +--------------------------+--------------------+
        |            FSM           |        STATE       |
        +--------------------------+--------------------+
        | RRC TOP FSM              |SCANNING            |
        | RRC SEARCH FSM           |WAIT_RSSI           |
        | RRC ACTIVE FSM           |NULL                |
        | PMM PLMN FSM             |NORM_WAITCELL       |
        | EMM MAIN FSM             |NULL                |
        | EMM AUTH FSM             |NULL                |
        | EMM CONN FSM             |NULL                |
        | EMM TAU FSM              |NULL                |
        | EMM TEST FSM             |NULL                |
        | ESM BEARER FSM           |BEARER_NULL         |
        | SMS MT FSM               |IDLE                |
        | SMS MO FSM               |IDLE                |
        | HP MAIN FSM              |IDLE                |
        | HP USIM FSM              |READY               |
        | HP SMS MO FSM            |IDLE                |
        | HP SMS MT FSM            |IDLE                |
        | HP CAT FSM               |IDLE                |
        +--------------------------+--------------------+
    
    OK
    
    
    DL SYNCHRO STATISTICS
    =====================
        Synchro state                         : FAST SCAN
        PPU SIB1 ACQ watchdog                 : 0
        Frequency Hypothesis RF  (Hz)         : 0
        RSRP (dBm)                            : -21474836.00
        RSRQ  (dB)                            : -9.51
        Channel estimation state (Cell-spec.) : LOW CINR
        Channel estimation state (UE-spec.)   : LOW CINR
        Channel estimation state (MBSFN)      : LOW CINR
        Channel estimation CINR               : -7.55
        Channel length                        : SHORT
      AGC
        AGC RX gain (dB)                      : 26.94
        RX PSD BO (dBFs)                      : -23.91
        RX PSD (dBm)                          : -97.12
        Noise level RS (dBm)                  : -128.24
        Digital gain (dB)                     : 3.06
        CINR RS (dB)                          : 10.15
      NARROWBANDS
        Last DL NB                            : Central
        Last UL NB                            : 7
      AFC
        Frequency offset RF  (Hz)             : 0
        Frequency offset BB  (Hz)             : 0
      PBCH
        MIB received quantity                 : 815
        MIB timeout quantity                  : 0
    
    OK
    
    SYSTEM FSM
    ==========
        +--------------------------+--------------------+
        |            FSM           |        STATE       |
        +--------------------------+--------------------+
        | RRC TOP FSM              |SCANNING            |
        | RRC SEARCH FSM           |WAIT_CELL_ID        |
        | RRC ACTIVE FSM           |NULL                |
        | PMM PLMN FSM             |NORM_WAITCELL       |
        | EMM MAIN FSM             |NULL                |
        | EMM AUTH FSM             |NULL                |
        | EMM CONN FSM             |NULL                |
        | EMM TAU FSM              |NULL                |
        | EMM TEST FSM             |NULL                |
        | ESM BEARER FSM           |BEARER_NULL         |
        | SMS MT FSM               |IDLE                |
        | SMS MO FSM               |IDLE                |
        | HP MAIN FSM              |IDLE                |
        | HP USIM FSM              |READY               |
        | HP SMS MO FSM            |IDLE                |
        | HP SMS MT FSM            |IDLE                |
        | HP CAT FSM               |IDLE                |
        +--------------------------+--------------------+
    
    OK
    
    
    DL SYNCHRO STATISTICS
    =====================
        Synchro state                         : CELL_SEARCH
        PPU SIB1 ACQ watchdog                 : 0
        Frequency Hypothesis RF  (Hz)         : -2000
        RSRP (dBm)                            : -21474836.00
        RSRQ  (dB)                            : -9.51
        Channel estimation state (Cell-spec.) : LOW CINR
        Channel estimation state (UE-spec.)   : LOW CINR
        Channel estimation state (MBSFN)      : LOW CINR
        Channel estimation CINR               : -12.31
        Channel length                        : SHORT
      AGC
        AGC RX gain (dB)                      : 26.92
        RX PSD BO (dBFs)                      : -21.60
        RX PSD (dBm)                          : -89.30
        Noise level RS (dBm)                  : -119.30
        Digital gain (dB)                     : 3.08
        CINR RS (dB)                          : 10.15
      NARROWBANDS
        Last DL NB                            : Central
        Last UL NB                            : 7
      AFC
        Frequency offset RF  (Hz)             : 0
        Frequency offset BB  (Hz)             : 0
      PBCH
        MIB received quantity                 : 861
        MIB timeout quantity                  : 0
    
    OK
    .
    SYSTEM FSM
    ==========
        +--------------------------+--------------------+
        |            FSM           |        STATE       |
        +--------------------------+--------------------+
        | RRC TOP FSM              |CAMPED              |
        | RRC SEARCH FSM           |CAMPED_ANY          |
        | RRC ACTIVE FSM           |IDLE                |
        | PMM PLMN FSM             |ANY_CAMPED          |
        | EMM MAIN FSM             |NULL                |
        | EMM AUTH FSM             |NULL                |
        | EMM CONN FSM             |NULL                |
        | EMM TAU FSM              |NULL                |
        | EMM TEST FSM             |NULL                |
        | ESM BEARER FSM           |BEARER_NULL         |
        | SMS MT FSM               |IDLE                |
        | SMS MO FSM               |IDLE                |
        | HP MAIN FSM              |IDLE                |
        | HP USIM FSM              |READY               |
        | HP SMS MO FSM            |IDLE                |
        | HP SMS MT FSM            |IDLE                |
        | HP CAT FSM               |IDLE                |
        +--------------------------+--------------------+
    
    OK
    
    
    DL SYNCHRO STATISTICS
    =====================
        Synchro state                         : DRX_SLEEP
        PPU SIB1 ACQ watchdog                 : 0
        Frequency Hypothesis RF  (Hz)         : 0
        RSRP (dBm)                            : -79.21
        RSRQ  (dB)                            : -8.60
        Channel estimation state (Cell-spec.) : HIGH CINR
        Channel estimation state (UE-spec.)   : LOW CINR
        Channel estimation state (MBSFN)      : LOW CINR
        Channel estimation CINR               : 13.25
        Channel length                        : SHORT
      AGC
        AGC RX gain (dB)                      : 44.82
        RX PSD BO (dBFs)                      : -21.78
        RX PSD (dBm)                          : -82.19
        Noise level RS (dBm)                  : -89.33
        Digital gain (dB)                     : 0.00
        CINR RS (dB)                          : 10.12
      NARROWBANDS
        Last DL NB                            : Central
        Last UL NB                            : 7
      AFC
        Frequency offset RF  (Hz)             : -283
        Frequency offset BB  (Hz)             : 0
      PBCH
        MIB received quantity                 : 877
        MIB timeout quantity                  : 0
    
    OK
    .
    SYSTEM FSM
    ==========
        +--------------------------+--------------------+
        |            FSM           |        STATE       |
        +--------------------------+--------------------+
        | RRC TOP FSM              |CAMPING             |
        | RRC SEARCH FSM           |WAIT_SIB1           |
        | RRC ACTIVE FSM           |NULL                |
        | PMM PLMN FSM             |NORM_WAITCELL       |
        | EMM MAIN FSM             |NULL                |
        | EMM AUTH FSM             |NULL                |
        | EMM CONN FSM             |NULL                |
        | EMM TAU FSM              |NULL                |
        | EMM TEST FSM             |NULL                |
        | ESM BEARER FSM           |BEARER_NULL         |
        | SMS MT FSM               |IDLE                |
        | SMS MO FSM               |IDLE                |
        | HP MAIN FSM              |IDLE                |
        | HP USIM FSM              |READY               |
        | HP SMS MO FSM            |IDLE                |
        | HP SMS MT FSM            |IDLE                |
        | HP CAT FSM               |IDLE                |
        +--------------------------+--------------------+
    
    OK
    
    
    DL SYNCHRO STATISTICS
    =====================
        Synchro state                         : SIB1_ACQ
        PPU SIB1 ACQ watchdog                 : 0
        Frequency Hypothesis RF  (Hz)         : 0
        RSRP (dBm)                            : -21474836.00
        RSRQ  (dB)                            : -10.11
        Channel estimation state (Cell-spec.) : HIGH CINR
        Channel estimation state (UE-spec.)   : LOW CINR
        Channel estimation state (MBSFN)      : LOW CINR
        Channel estimation CINR               : -11.16
        Channel length                        : SHORT
      AGC
        AGC RX gain (dB)                      : 44.82
        RX PSD BO (dBFs)                      : -21.12
        RX PSD (dBm)                          : -85.40
        Noise level RS (dBm)                  : -128.24
        Digital gain (dB)                     : 3.99
        CINR RS (dB)                          : 9.18
      NARROWBANDS
        Last DL NB                            : Central
        Last UL NB                            : 7
      AFC
        Frequency offset RF  (Hz)             : -249
        Frequency offset BB  (Hz)             : 0
      PBCH
        MIB received quantity                 : 928
        MIB timeout quantity                  : 0
    
    OK
    .
    SYSTEM FSM
    ==========
        +--------------------------+--------------------+
        |            FSM           |        STATE       |
        +--------------------------+--------------------+
        | RRC TOP FSM              |SCANNING            |
        | RRC SEARCH FSM           |WAIT_CELL_ID        |
        | RRC ACTIVE FSM           |NULL                |
        | PMM PLMN FSM             |NORM_WAITCELL       |
        | EMM MAIN FSM             |NULL                |
        | EMM AUTH FSM             |NULL                |
        | EMM CONN FSM             |NULL                |
        | EMM TAU FSM              |NULL                |
        | EMM TEST FSM             |NULL                |
        | ESM BEARER FSM           |BEARER_NULL         |
        | SMS MT FSM               |IDLE                |
        | SMS MO FSM               |IDLE                |
        | HP MAIN FSM              |IDLE                |
        | HP USIM FSM              |READY               |
        | HP SMS MO FSM            |IDLE                |
        | HP SMS MT FSM            |IDLE                |
        | HP CAT FSM               |IDLE                |
        +--------------------------+--------------------+
    
    OK
    
    
    DL SYNCHRO STATISTICS
    =====================
        Synchro state                         : CELL_SEARCH
        PPU SIB1 ACQ watchdog                 : 0
        Frequency Hypothesis RF  (Hz)         : 0
        RSRP (dBm)                            : -21474836.00
        RSRQ  (dB)                            : -10.11
        Channel estimation state (Cell-spec.) : LOW CINR
        Channel estimation state (UE-spec.)   : LOW CINR
        Channel estimation state (MBSFN)      : LOW CINR
        Channel estimation CINR               : -13.89
        Channel length                        : SHORT
      AGC
        AGC RX gain (dB)                      : 26.89
        RX PSD BO (dBFs)                      : -21.00
        RX PSD (dBm)                          : -87.18
        Noise level RS (dBm)                  : -117.18
        Digital gain (dB)                     : 3.11
        CINR RS (dB)                          : 9.18
      NARROWBANDS
        Last DL NB                            : Central
        Last UL NB                            : 7
      AFC
        Frequency offset RF  (Hz)             : -254
        Frequency offset BB  (Hz)             : 0
      PBCH
        MIB received quantity                 : 990
        MIB timeout quantity                  : 0
    
    OK
    

    Appreciate any tips on where to look next!

    Scott



  • Updates

    I guess my sims aren't activated for LTE-M (they should be) but only NB-IoT. I upgraded my modem to NB1-41019 and it works now :)


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