CC3200MOD: Self signed CAcertificate always expire in one month

Part Number:CC3200MOD

Hello everyone,
I'm facing a strange issue with a self signed certificate used by the mqtt client SSL connection, I generate a certificate that expires after 50 years, but one month after the certificate creation, the device returns the code -461 (connected with certificate date verification error) on connection. During the previous month I didn't have any issue on mqtt client connections.

I've followed the guide in the SDK documentation "CC32xx Serial Wifi.pdf" where I added the -days option when generating CA file, here my openssl commands to generate the certificate:

# Generate a CA certificate valid for 50 years:
$ openssl req -out CAroot.pem -new -x509 -days 18250
# this command create CAroot.pem and privkey.pem files.

# Generate server certificate/key pair:
$ openssl genrsa -out server.key 1024
$ openssl req -key server.key -new -out server.req -days 18250
$ echo 00 > file.srl
$ openssl x509 -req -in server.req -CA CAroot.pem -CAkey privkey.pem -CAserial file.srl -out server.pem
# these commands create server.key and server.pem files

# Translate CA certificate to DER format (to be read from the device):
$ openssl x509 -in CAroot.pem -inform PEM -out CAroot.der -outform DER

Then I flash the /crt/CAroot.der file on the CC3200, my mqtt client configuration is the following:

 
char *security_file_list[] = {"/crt/CAroot.der"};
 
SlMqttClientCtxCfg_t broker_config =
{
    {
        SL_MQTT_NETCONN_SEC,
        "192.168.1.120",
        8884,
        SL_SO_SEC_METHOD_TLSV1_2,
        SL_SEC_MASK_TLS_RSA_WITH_AES_256_CBC_SHA,
        1,
        security_file_list
    },
    SERVER_MODE,
    true,
};

I also tried with 90 days, but configuring a date farther than 30 days from today on the server and the device, the -461 error will be returned by the sl_Connect() function.

Am I doing something wrong?
Is there any configuration that I'm missing?

Thanks.

Regards,
Rosario