ESP32 Forum

Hello Espressif,

I am trying to send a json data through HTTPS POST Request to a Postman mock server. The data from nrf52833 dk is received to ESP32-C3 through UART Communication. To store the data in JSON format i have used esp-idf-cJson github library. For UART and HTTP protocol I have referred to uart_asyn_rxtx_example and esp_http_client example.
The issue is when I am storing the data in uart thread in json format and print the Json through "cJSON_Print(root)" it shows me "Guru Meditation ErrorL Core 0 Panic'ed(store access fault)" and further when the char string is passed to http thread in "esp_http_client_set_post_field(client, json_packet, strlen(json_packet))" function it shows me "Meditation ErrorL Core 0 Panic'ed(Load access fault)". I am not able to resolve the issue from last fortnight . I have attached the error image and code file for the same.

Hello Espressif teams,
It would be really nice if I get some response from side.

I have seen this in a quite similar module environment you are using. I could debug this down to a stack overflow issue. I changed all str copy task to strictly copy not more then the buffer sizes are ( e.g. snprintf() ) and doubled the stack size of the UART and WiFi stack.
Since I have not seen this error again. To nail it down what exactly causes this issue was not in the budget of the project.

May be it helps

Hi meetshah10,

From the screenshots, the issue looks like a heap corruption: the backtrace points to the heap allocator code. I would recommend enabling heap poisoning as described in this section of the docs: https://docs.espressif.com/projects/esp ... corruption
This should help you find which code might be writing out of bounds of the allocated memory.