M66 Https POST always failed with CME Error: 3815

IoT Modules GSM Module
1

I’m using M66FA-04-STD (Firmware: M66FAR02A07BT)
I want to send http post to a simple test server
for this purpose I’m using ptsv2.com website that is a simple post test server
I get the ca_cert of server from my browser (and also can do it with openssl)
Then tried to send a simple post data to this site but i always get 3815 CME Error
I tried many conditions but no success. Http post is working but Https no!!!

This is my AT commands:

ATI
Quectel_Ltd
Quectel_M66
Revision: M66FAR02A07BT
OK

+CFUN: 1

+CPIN: READY

Call Ready

SMS Ready

AT+QSECWRITE=“RAM:ca_cert.pem”,1922,10
CONNECT
+QSECWRITE: 1922,2975
OK

AT+QIFGCNT=0
OK

AT+QICSGP=1,“my_secret_apn!!”
OK

AT+QIREGAPP
OK

AT+QIACT
OK

AT+QISTAT
OK
STATE: IP GPRSACT

AT+QILOCIP
22.120.236.113

AT+QSSLCFG=“sslversion”,1,4
OK

AT+QSSLCFG=“seclevel”,1,1
OK

AT+QSSLCFG=“ciphersuite”,1,“0XFFFF”
OK

AT+QSSLCFG=“ignorertctime”,1
OK

AT+QSSLCFG=“https”,1
OK

AT+QSSLCFG=“cacert”,1,“ca_cert.pem”
OK

AT+QSSLCFG=“httpsctxi”,1
OK

AT+QHTTPURL=31,60
CONNECT
{Enter: https://ptsv2.com/t/hadidi/post}
OK

AT+QHTTPPOST=21,60,60
+CME ERROR: 3815

2

Hi,
image
Please execute AT+QSSLCFG=“cacert”,1,“RAM:ca_cert.pem” and then try it again.
3815 means HTTP socket connect error.

3

Sorry i forgot to mention that i check with all possibility of SSL modes (SecLevel=0,1) and also set the certificate correctly.
I found that new websites Cipher suit not match M66 module

4

Hi,
You can execute AT + QSSLCFG=? to check which cipher suite the module supports.
If the module does not support that cipher suite, the https post will fail.