I am trying to get a MKR NB 1500 work with a LTE-M SIM card, but SARA module is having issue interfacing with SIM card. The SIM does not have PIN.
Looks like the SARA module is working. With SerialSARAPassthrough sketch loaded, I get replies to AT command specific to radio modem:
AT+GMM SARA-R410M-02B AT+CGSN 352xxxxxxxxxxxx
AT+CPAS +CPAS: 0 AT+CFUN? +CFUN: 1 AT+CIND? +CIND: 5,0,0,0,0,0,0,0,0,0,0,2 OK AT+URAT? +URAT: 7
However when issuing SIM related AT commands they give “SIM failure/SIM not inserted/SIM PIN required” errors, like so
AT+CIMI +CME ERROR: SIM failure AT+CCID +CME ERROR: SIM failure AT+COPS? +CME ERROR: SIM failure AT+CREG? +CME ERROR: SIM failure AT+CNUM +CME ERROR: SIM PIN required AT+CPIN? +CME ERROR: SIM not inserted
I traced the pins on the SIM card holder and I find something funny - I am getting 0V on SIM VCC.
Anybody experience similar issue?