I'm trying to connect with SIM7000E module (I'm using waveshare SIM7000E NB-IoT HAT board) using HTTPS to https://httpbin.org, however whatever I try, I get an error after using command AT+SHCONN with a message "CME ERROR: operation not allowed". When I try to connect with HTTP to http://httpbin.org using the same code, everything works fine and AT+SHCONN command returns "OK". I'm out of ideas what I could be doing wrong, has anyone solved this issue? Below I paste AT commands I use to connect to https://httpbin.org:
AT
OK
AT+CMEE=2
OK`
AT+CPIN?
CPIN: READY
OK
AT+CGMM
SIMCOM_SIM7000E
OK
AT+CGMR
Revision:1351B08SIM7000E
OK
AT+COPS?
COPS: 0,0,"Orange Orange",3
OK
AT+CSQ
CSQ: 20,0
OK
AT+CNACT=1, "iot"
OK
APP PDP: ACTIVE
AT+CNACT?
CNACT: 1,"xxx.xx.xxx.xxx" //Here I get valid IP
OK
AT+CSSLCFG="ignorertctime",1,1
OK
AT+CSSLCFG="sslversion",1,3
OK
AT+SHSSL=1,""
OK
AT+SHCONF="URL","https://httpbin.org"
OK
AT+SHCONF="BODYLEN",1024
OK
AT+SHCONF="HEADERLEN",350
OK
AT+SHSSL?
SHSSL: 1,"",""
OK
AT+SHCONN
CME ERROR: operation not allowed
I'd be grateful for any help.
I have set ignoring time with AT+CSSLCFG="ignorertctime",1,1 and set skipping certificate verification with AT+SHSSL=1,"".
I have tried setting current time instead of using "AT+CSSLCFG="ignorertctime",1,1", but it fails as well. Also I tried following https://gist.github.com/baconcheese113/1f0264727fce3fa51a5bb06fa031aed2 instruction but it fails the same way with AT+SHCONN. I have tried using different sim card and also different SIM7000E module, the same error with AT+SHCONN happens then as well. I have also tried connecting to different URLs than "https://httpbin.org" but it is the same error with all URLs I try.