How to use the sntp protocol on the ESP8266 to connect to a server in ssl?

Clancys
Posts: 4
Joined: Tue Jun 26, 2018 9:52 pm

How to use the sntp protocol on the ESP8266 to connect to a server in ssl?

Postby Clancys » Mon Jul 23, 2018 6:11 pm

Hello,

I am using an ESP8266 with the esp-open-sdk with the C language.

I have tried to use this code to get the timestamp but it is failing everytime - I am only getting 0 :
sntp_set_timezone(2);
sntp_setservername(0, "fr.pool.ntp.org");
sntp_init();
timestamp = sntp_get_current_timestamp();
os_printf("time : %d and %s\n", timestamp, sntp_get_real_time(timestamp));

As you may have understand from the subject, i am trying to connect to a server to do an https request (i am using the espconn_secure_*** functions) but it is failing everytime.
It may be because of the time (can't authenticate the certificate because of the validity over time) or because of a non-supported protocol. The TLS protocol is used for the secure transaction, the server is using TLSv1.2 and i read on internet that the ESP8266 was only supporting TLSv1.1; Is that right?
Another strange thing is that after i try to establish the tcp connection, i get the timestamp correctly.

You can see next how i am trying to connect to the server - at address 0x70000 there is the CA of the server i am trying to connect the ESP:
espconn_secure_ca_enable(1, 0x70);
espconn_secure_connect(&conn);

Am i using espconn_secure_ca_enable correctly? Am i giving him the correct document to process? Is this function necessary?
Any remarks or commentary are highly appreciated.
Clancys

Clancys
Posts: 4
Joined: Tue Jun 26, 2018 9:52 pm

Re: How to use the sntp protocol on the ESP8266 to connect to a server in ssl?

Postby Clancys » Wed Nov 28, 2018 5:23 pm

Hello back,

I have finally found what was happening.
You almost have to do exactly what Espressif is doing in their example,
the SNTP function needs some time given through the os_timer_...
Then you just have to wait for the sntp to get the time and
you can use the ssl function as much as you want.

Clancys.

Her Mary
Posts: 411
Joined: Mon Oct 27, 2014 11:09 am

Re: How to use the sntp protocol on the ESP8266 to connect to a server in ssl?

Postby Her Mary » Tue Jan 29, 2019 5:31 pm

That's true. SSL certificate will have an expire date, so you need to get the sntp time at first to see if the SSL certificate expired. Otherwise the SSL will fail.

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