Thru ble you can send packets of bytes, its up to you what those bytes represent. If you send array of bytes it will be just packet of bytes for ble application, but in your code you can cast it to array or even structure. Look here: esp_ble_gattc_write_char_descr(esp_gatt_if_tgattc_if, uint16_t con...

Recently i found this one and with very few changes it works:
https://github.com/cornelis-61/esp32_Captdns

Probably data amount is bigger than buffer size and you have to read and concatenate data in this event: case HTTP_EVENT_ON_DATA: ESP_LOGD(TAG, "HTTP_EVENT_ON_DATA, len=%d", evt->data_len); if (!esp_http_client_is_chunked_response(evt->client)) { // Write out data // printf("%.*s", evt->data_len, (c...

Probably its not what you are looking for, but in freertos you have stack overflow hook, which can be called right before crash (in 1 particualr case):
https://www.freertos.org/Stacks-and-sta ... cking.html

There is few things. First of all like i suspected manufacturer data is send in scan response packet. This is advertising packet which is length of 17 bytes: I (18439) GAP: mibp manufacturer size:20, adv_data_len:17 I (18439) GAP: 03 19 00 00 02 01 06 03 03 cd ab 05 09 6d 69 62 I (18449) GAP: 70 Man...

Can you confirm that your binary size is:

Total Write binary data length : 719696