Thank you for this detailed post.

I agree that CAN bus /TWAI is a more solid/stable solution, but by using bluetooth/wifi/ESPNOW wires don't need to be routed from the engine bay, through the firewall, to the inside of the car. On newer cars, this is not a quick or easy job and if not done ...

I've been working with the ESP32 P4 Function EV dev kit and LOVE the fast display updates with the MIPI DSI LCD.
This is going to be perfect for a automotive digital dash, since the P4 supports 3 TWAI controllers.

I would like to add wireless sensors for oil pressure, brake line pressure, etc using ...

After many hours of reading docs and testing code, as far as I can see, it is not possible to use a pre-encrypted flash bin file, using the same burned in flash encryption key that was saved to host, to update via SD card.

This is due to the verification of the app image via the "magic number ...

In "menuconfig" look for "Offset of partition table" and change it from 0x8000 to 0x10000.
That will give you enough room for flash encryption and secure boot code on the bootloader.

I have solved it myself, the problem was too little ram.


typedef struct binary_data_t {
unsigned long size;
unsigned long remaining_size;
void *data;
} binary_data_t;

size_t fpread(void *buffer, size_t size, size_t nitems, size_t offset, FILE *fp) {
if (fseek(fp, offset, SEEK_SET) != 0 ...

I'm using IDF v5.2.2 on an ESP32 rev1 dev kit C.

I use the SD card to update the firmware and reboot. It works very well and is based on this code:
https://www.esp32.com/viewtopic.php?t=19364
Thank you @minze25 !

I will be enabling flash encryption and want to be able to update via the SD card ...

I am fairly new to IDF and just migrated a project from IDF 4.4 to 5.2.
It also had many linking errors when the 4.4 project was opened in 5.2

My solution was to create a new project in IDF 5.2 using the template-app and copy over the source code.
It did have a few different #include errors, but ...

Thanks for this!
I've seen this on a few programs and will now spend some time to understand it better.

Thanks for your suggestions.

I went back the next day and had a close look.
You were right, I missed CAN.c.
I renamed it CAN.cpp and added it to the CMakeLists.txt.

All is working well now!
Thanks you!

I think this is a C/C++ difference issue, but don't know enough about C/C++ to know what to do :(

I am working with the Arduino library: https://github.com/miwagner/ESP32-Arduino-CAN
The example program in "esp32can_basic.ino" compiles without errors and runs in the Arduino IDE.

I have brought ...