Detecting a device disconnection of the IoT cloud

[CyrylD]

Hi,
I have 2 esp32 connected to the IoT Cloud and one of them is connected to an UPS (the second one).
My goal is to find a way to detect (on the second esp32) when the first esp32 (that's not connected to an UPS) is not connected to the IoT Cloud.
I've search on the internet but I can't find something like this.
Does anyone have an idea how to do this (with codes lines ?) ?

Thanks a lot for your answer.

[dbeamonte_arduino]

Hey!

I think there might be several ways to implement what you describe (if I understand correctly your use case).

One simple option could be the following

• Define an integer variable in Device#1 (UPS) called uptime (or whatever name you want)
  • Set the Variable Update Policy to Periodically and define a period o N seconds.
• Device an integer variable in Device#2 called dev1_uptime which is synced with the first one
  • Use the " Sync with other thing" option
  • More info in any of these tutorials: tutorial 1 and tutorial 2
• In the sketch of Device#1, set uptime to millis() inside your loop() --> uptime = millis();
• In the sketch of Device#1, you can check the value of dev1_uptime (as it is synced with uptime and it will automatically receive its value)
  • If the value has not changed for Nx2 seconds, it can mean that the device went down or had some connectivity problems

I hope the process is clear and I hope this helps.

[CyrylD]

Oh thanks a lot !
I hadn't think about using this Sync option ! It should work perfectly .

Have a good day