The sender sets the topic of a message. Others subscribe to a pattern of a topic. For example my iot device sends write topics with data to be written to a db. My Java program subscribes to writes and puts the data in a db. My mgmt program can send a who topic. My iot devices all subscribe to who to...

1) you made me curious; I found this: http://dagrende.blogspot.com/2017/02/fi ... p.html?m=1
2) I don't understand: when you make a phone call how do you know what to say?
3) one way: subscribe to topic for new certificates.

Tom Meyers

Investigate SVD

http://blog.kleinproject.org/?p=588

Please tell us what you think.

Tom

What we are getting at is called Ringing.

It occurs when one signal tries to set the value high and another to set it low. Do you have that?

Is the other processor setting it high and your code setting it low? It looks like it.

Tom

Can you describe it show the circuit for the source of the interrupt.

And maybe the scope image of the interrupt when not connected to gpio.

Tom

Really!? This is the third time today,/here I have suggested this: Google "esp32 ....." Like "esp32 nominal channel bandwidth" : https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.micronovasrl.com/wp-content/uploads/2020/11/R20126901.pdf&ved=2ahUKEwjejeSlv-PyAhUPWDABHbjBBlgQFnoECAcQAQ&...

I googled: "esp32 pulse count"

This looks promising: https://docs.espressif.com/projects/esp ... /pcnt.html

What did you look for?

Tom

What have you studied? What have you searched for?

Start with Google: "multitasking free rtos tutorial"

Maybe some multiprogramming: esp 32 has 2 + processors.

Lots of books available and classes too.

I don't remember using < > in include syntax.