Get notified when I don t receive mqtt messages anymore

[lucianv]

Hi,
I am working on a flow where I am connected to a mqtt topic and receive values of a sensor. Everything works fine but if sensor stop sending new values, then nodered display last value received forever. I want to do some kind of alarm like if since last message there is more than 1 minute pop up a message or something.
Any clue how can I achieve this?
Thanks in advance

[ukmoose]

The topmost thread when you posted this asks the same question and contains all the answers...

How can I get feedback from MQTT

Hi, I'm creating my first project. I want to control the start of my boiler. The system is very simple, an ESP32 reads the temperature and sends it once a minute to mosquito on a raspberry, node-red reads the temperature and commands the boiler. I realized that there might be a problem. If the boiler is on and the ESP32 board no longer sends the temperature, the boiler will never turn off. How can I tell with node-red if the sensor is still working? Thank you

[lucianv]

Thanks a lot. Means my way of searching this was pretty poor since I couldn t find that topic. I will read it.
Thanks again