ESP32 Forum

Hello,

I am trying to configure the "aws_iot" example to work with an external crypto chip (ATECC608A by Microchip). This chip stores the private key and can perform the required ECDSA signature operations for mutual authentication. I have already configured the chip to communicate over I2C, and I am now currently trying to overwrite the mbedtls_ecdsa_sign function to offload the signature process to the external chip. However, any kind of traffic over the I2C bus produces the following error:
Again, I should stress that I2C communication normally works with this chip. I have not changed anything in hardware. It just seems that when I call the function "aws_iot_mqtt_connect(&client, &connectParams)" (from the subscribe_publish.c file in the example), then the communication breaks down. Does anyone know what is happening here?

Thanks in advance for the help.

Hello again. It turns out that mbedtls and the aws_iot example are not the cause of the problem. It seems that calling xTaskCreatePinnedToCore is what causes the I2C problems to occur. Maybe it is a sync issue? I'm not really sure. Does anyone have any suggestions?

Hi Gerry,
I am trying to get my project setup to use the ATECC608A device for Google IoT, but I have not been able to find any details on how to go about this. I was hoping you might be able to share some of your secrets on this.

Thanks in advance.

-Josh