Hi! I used your ESP8266 example code but unable to connect. I never get past the "PubSubClient connecting to a1dxdgsyyuvt28-ats.iot.us-east-1.amazonaws.com...." No errors. It just keeps printing the dots but never connects.
Arduino 1.8.9, ESP8266 board 3.0.2, PubSubClient (Nick O'Leary's) version 2.6.0.

Any suggestions on how to go about debugging this? When I diff my code with yours, the only difference is the ssid, password and the certificates.

Hello,

it seems there is a waste on the following instructions.

The raw data is not the same size of the Base64 encoded data. It is actually about 75% of its size.

uint8_t binaryCert[certificatePemCrt.length() * 3 / 4];
uint8_t binaryPrivate[privatePemKey.length() * 3 / 4]; 

C macros from other projects.

https://www.ffmpeg.org/doxygen/3.2/group__lavu__base64.html
https://api-docs.iotivity.org/latest-c/base64_8h.html#a7d5a3b6936df0cd2df64ed83bcb303df

BTW, thanks for this great example.

I am connecting ESP8266 to AWS IoT Core using this code and it works well and is sending messages.
But I am facing a problem with WifiClientSecure. When it is trying to connect to AWS my code is blocked for like 6 seconds or more depending on the response. But I have some critical proccess happening and my code never can be blocked.

What could I do to make the process asynchronous?

Thanks.

I think this declaration is missing:
void pubSubCheckConnect();

The Arduino IDE gives me an error like:
"pubSubCheckConnect not declared inthis scope"
when I compile. If I add the declaration at the top with the others, clean compiles just fine.

Hi, I have followed the instructions and entered the certificate.pem and private.pem and I have formatted as instructed. I am unable to connect. Just wondering do I need to enter the rootCert anywhere or should I be able to connect without it?