ATOM-DTU-NB-IoT - modem does not respond anymore

fkarner

Nice to know that there is no problem caused by this error.

Contacts facing upward, shape as indicated on the label, should be OK?
The SIM card does not use a PIN, nevertheless I tried this:

void nbConnect(void) {
  unsigned long start = millis();
  log("SimStatus: " + String(modem.getSimStatus()));
 if (GSM_PIN && modem.getSimStatus() != 3) 
    {
    modem.simUnlock("0000");
    }
  log("SimStatus: " + String(modem.getSimStatus()));
....

gives this:
19:20:52.856 -> SimStatus: 0
19:21:13.040 -> SimStatus: 0
19:21:13.040 -> Initializing modem...

So according to this, the SIM card is not ready, right? Could there be a mechanical problem with the SIM card itself?

flori

felmue

Hello @fkarner

I get SimStatus: 1 when SIM card is installed and recognized. (I get SimStatus: 0 if I remove the SIM card.)

So yes, it appears that something is either wrong with the SIM card you are using or with the sim card slot in the DTU.

Thanks
Felix

fkarner

Hello @felmue,

I used your pass-through code example to send the AT+CSMINS? command wich gives this with inserted SIM card:

20:21:03.854 -> AT+CSMINS?
20:21:03.854 -> +CSMINS: 0,0
20:21:03.854 ->
20:21:03.854 -> OK

So it seems that the SIM card is not recognized... Maybe broken. Do you have any recommendation for Nb Iot SIM cards? Maybe https://www.miotiq.com/ for Italy?

Thanks flori