Heart beat check of esp

[BartSr]

I am having several ESP's interfacing sensordata for domoticz.
There's an ESP monitoring DUCO ventilation system.
For some reason that ESP freezes sometimes. Ping remains possible.
I plan to force that ESP to sent every minute a pulse to domoticz which I mention a hartbeat. But how can I monitor that from domoticz or is there another solution?

[waltervl]

If the ESP updates its value to Domoticz every x minutes you can check the last update time and have Domoticz send a notification when it takes too long. You can set this with the notification button on the device widget.
This only works for real sensors like temperature, lux etc.

If it is a switch sensor you can have dzvents check it with thedevice.lastUpdate.minutesAgo attribute.

[franzelare]

i implemented exact this, i send a on command from the ESP to domticz every minute and use a LUA script when the device changes to send an off command back
in the ESP i run a timer, that when it doesn's see the off command back for 5 minutes it automatically reboots
the only issue i have is that on the reboot the IO will be set back to default... like for my ventilation it will jump on to high mode for a few seconds on a reboot before pulling the old status again from domoticz and going to the right speed level

p.s. i do the same on the mysensor arduino's with RF24 connection to my domoticz to control my curtains

[BartSr]

@Walter
Thanks for this suggestions which looks reliable to me.

@Franzelare
Thanks for sharing your solation but if the esp freezes it also cannot do a reset though?

[franzelare]

i see that the ESP is sometimes not communicating out but still be able to reset base on internal timerloop
never seen a full freeze so far

[BartSr]

Well, it can according my experience.