size about esp_blufi_send_custom_data (IDFGH-14269)

[nzomkxia]

Answers checklist.

• I have read the documentation ESP-IDF Programming Guide and the issue is not addressed there.
• I have updated my IDF branch (master or release) to the latest version and checked that the issue is present there.
• I have searched the issue tracker for a similar issue and not found a similar issue.

General issue report

I am currently using the BLUFI API from ESP-IDF to transfer file fragments from the device to the app. I’ve tried setting the fragment size to 100 bytes or 512 bytes, then read the file contents in a loop and send them using the esp_blufi_send_custom_data interface. However, once the loop count exceeds 100 iterations, the esp_blufi_send_custom_data call becomes stuck and the transmission cannot be completed. Do you have any suggested solutions?

int count = 0; 
 while ((n = fread(buf, 1, CHUNK_SIZE, fp)) > 0) {
        count ++;
        int is_last_chunk = (n < CHUNK_SIZE);

        unsigned char send_buf[CHUNK_SIZE + 1];
        send_buf[0] = is_last_chunk ? '2' : '1';
        memcpy(send_buf + 1, buf, n);

        BLUFI_INFO("sending before.....%d", count);   
        esp_err_t err = esp_blufi_send_custom_data(send_buf, n + 1);
        if (err !=  ESP_OK) {
            BLUFI_ERROR("send error, count is %d", count);
            fclose(fp);
            return -1;
        } else {
            BLUFI_INFO("sending.....%d", count);
        }

        if (is_last_chunk) {
            BLUFI_INFO("sending done");
            break;
        }
    }