What is happening on mqtt broker? You probably can run it as verbose to see more.

There exist alert buttons like you describe. I have purchased them in the past. And they xan activate a relay (sold as a pair) Use the transmitter to activate the relay; detect it with an esp. Use IFTTT free service to connect devices. Run something on your phones to receive alerts. Or activate an a...

From my reading it appears that the web server and the dht code will be on the same esp32.

In that case in the dht code write the formatted or unformatted result to a global variable and in the server code pick it up.

Tom Meyers

Oh my so many ways here are a few: 1) a long wire 2) IR transmitter/receiver 3) conncect two esp32's to a common wifi router half way between the two points now only need to transmit/receive 1/2 the distance 4) a small vehicle that carrys the message 5) a whistle sound and listen for it at the other...

What is it you are measuring. 18650 planned. But what right now? A floating high?

I ask because i wonder what that signal looks like. It it is wiggling the two measurements could be different because of, for example, capacitance.

Thanks, tom

Non touch temp sensor? Or imersable.
Microphone - listen for boil?
Camera - watch for boil
Humidity sensor - boil humidity?

Tom

Example code? Results ?

Sometimes that is what is called "ringing". It can be cause by a circuot point being pulled hign and low at the same time. Check what is driving that point setting it high an another factor settinv it low. Tell us what you find. Internal pullups, ... external ... i dont know. Post some code a circui...

Sure you can do that. How: write code.

But first define what you want to do, not how, but only what. Then write how you will do that and finally: write code.

Good luck, Tom

1) go to your web browser
2) search for mqtt esp32 broker
3) tell us what you saw

Tom