Thanks everyone for the answers. However what I would like to do is create a routine with Dzvents that when I have the "red" indication (as shown in the image) causes a switch to operate which cuts the voltage to a device. The value of ".lastUpdate.minutesAgo" seems not to be the right solution because it continues to be increased in any case, regardless of the temperature value and the status of the "red" or normal indication.

Found the solution. I used asm volatile (" jmp 0 "); // reset to reboot the node each hour (or any other timing) .

Finally I've solved. I'm still using UIPEthernet sincee my problem was the use of DHT library (last rev) with UIPEhernet lib. I was having a restart of teh ETH port each time I was reading Temp/hum. I've changed into SimpleDHT lib and now it's working fine. I'm using a mix of W5100 and ENC28J60.

Did you try commenting out #define MY_DEBUG ? That might save you a few bytes.

@mfalkvidd Solved, it was my mistake on wiring. Thanks.

Why not purchase a Raspberry Pie and a SD card + casing , then you have a server?

@giangired yes, a counter or using millis() (which technically is a counter) is the right solution. Relay nodes can’t sleep, because nodes can not receive incoming commands when sleeping.

@gohan My understanding of the ESP8266 is that much like the ethernet solution, each node would have to be configured as a gateway as it is still running on an IP protocol like the ethernet node. I ran into this when I got some Sonoffs and was trying to connect them to my Vera Plus. I ended up using them with the ESPEasy firmware and a different plugin on my Vera.