What is the purpose of EN_DCDC and FB_DCDC (respectively 1.2_Reg_EN and 1.2V_Reg_FB in the images below)? What controls the EN line? Does our software control it? Is 1.2V needed for programming? We ask because it doesn’t appear to be on during programming on any board. It seems to be on in normal ...

That may be a red herring. See the note at the end of this section about merging constants: https://docs.espressif.com/projects/esp ... components

So it's prolly not actually that large

Version 6.12.0 (which uses IDF 5.5) worked just fine on my M4 Max.

Are you using the new driver that uses twai_new_node_onchip (in esp_twai.h/esp_twai_onchip.h) or are using the older twai_driver_install/twai_driver_install_v2 (in driver/twai.h)?

Oof. I'm a couple generations out of date, not even using v2. Looks like I have some upgrading to do...

There certainly are some super high end microcontrollers elsewhere in the market (Cortex M7 600mhz to 1ghz) that will run circles around the P4 at raw speed, but it's not a mainstream kind of thing that the ESP32 series is so good at serving.

I don't fathom a lot of people needing quad core 800 MHz ...

Very strange. The tools have had support for Apple Silicon for a while now and that hasn't gone away. I don't have this issue with my command line / VS Code installation, so it sounds like PlatformIO needs to be updated to support 5.5. I'll see if I can find out what the trick is, but you may have ...

Haven't noticed any problems with it in 5.5 at 500k, but I'm polling (third party J1939 library I'm using doesn't have a way to push messages to it).

Does polling still work for you?

Maybe you're taking too long in the ISR, try upping the queue length. I had to set mine to 500 to handle firmware ...

I think Let's Encrypt would require a domain and a public IP for the access point. I don't know of any existing implementations for this.

Can you reverse the model, where the ESP32 is communicating with HTTPS servers instead? In that case, you can use the Mozilla certificate bundle: https://docs ...

Below you'll find the benchmark I use for the ESP32-P4 in C, and my results at 400mhz. Maybe this will give you some inspiration for what you can use to start checking.

As for memory footprint, probably the best thing to do is ask the RTOS for the task/thread stack watermark, as long as all your ...

real development efforts are required


Real development efforts, hmmm. Like, say, putting together the industry's best toolchain and development framework that not only brings in hundreds of libraries but also works across several different architectures seamlessly without the user having to ...