I'm trying to figure out the SIM7080G module. The problem is related to the fact that I can not connect to a cellular operator. The SIM card I am using is working. Checked on a smartphone.
I met a similar situation on the forums (link, link), but there is no final solution anywhere. Next, I lay out a series of commands that I run to determine the states.
AT+CPIN?
+CPIN: READY
OK
AT+CSQ
+CSQ: 99.99
OK
AT+CGDCONT=1,"IP","Internet"
OK
AT+CNMP
+CNMP: 38
OK
AT+CGATT?
+CGATT: 0
OK
AT+CGNAPN?
+CGNAPN: 0,””
OK
AT+COPS?
+COPS: OK
AT+CNACT=1,1
+APP PDP: 0,DEACTIVE
AT+COPS=?
+COPS: ERROR
AT+CGATT=1
+CGATT: ERROR
I will say in advance that I can not display the error code. Described the problem here.
Could this be because the SIM card I'm using doesn't work with either NB-IoT or CAT-M? As I understand it, it should work with GSM and it suits me, but now nothing comes out.
I often saw advice to check the power that is supplied to the module. A little later, there will be an opportunity, I'll check.
Please tell me what could be the reason.
Thanks in advance.
The problem was solved. It consisted in the wrong organization of the power supply of the module. In response, I received a number of responses from the module (RDY, CFUN: 1, CPIN: READY, SMS Ready), which indicated that the module was restarted. The specification describes how to apply signals to the VBAT and PWKEY pins and hold the desired time. When I corrected the initialization, everything worked.
Also, the module does not really work in the GSM network and is intended exclusively for NB-IoT and CAT-M.