I know that SSL connection problem with AT command can be found in this BBS.
And I already refer "https://bbs.espressif.com/viewtopic.php?f=16&t=3381&p=73870&hilit=ssl#p73870" but it doesn't helpful.
I used ESP-WROOM-02D and please check below firmware information.
AT version:126.96.36.199(Mar 19 2020 18:15:04)
compile time:Mar 24 2020 16:16:12
Bin version(Wroom 02):3.0.3
In my board, with below AT command sequences,
> AT+CIPSTART="SSL","site's URL",443
"www.google.com" can be connected but "arduino.cc" can not be connected.
How I can check and solve problem?
Do there need more AT commands?
I want to check my own web server, but I think "arduino.cc" has same problem.
So I asked about "arduino.cc" first.
"GET /index.html HTTP/1.1 Host: google.com"
And I can see below message.
"HTTP/1.1 301 Moved Permanently
Content-Type: text/html; charset=UTF-8"
I'm not sure, I connect google with HTTPs or not.
And there are descriptions for "+CIPSSLCCONF".
Am I set it with esp_ca_cert.bin and esp_cert_private_key.bin?
Thans in advance.
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And some SSL server may need certificates to connect to it, but google.com is not one of them.
Thanks for your reply.
Would you check below comments?
* I don't change firmware and I used it original one.
1. I used same AT commands except for TCP and SSL in "AT+CIPSTART" for different URLs and "AT+CIPSSLSIZE=4096" for only SSL.
I wonder there need additional or different AT commands or not.
2. Would you explain how I can "capture Wi-Fi packets to make sure of it"?
3. You said "some SSL server may need certificates to connect to it, but google.com is not one of them".
"https://www.arduino.cc/" is public domain.
Would you share example to access "https://www.arduino.cc/" by using AT commands?
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