A simple timeout by Peter Scargill (email@example.com). After setting the topic and both safe and unsafe messages, for, for example MQTT (or simply putting 1 and 0 into the two messages) the node is triggered by any input and will send the SAFE message out. If continually triggered nothing more will happen but if allowed to timeout, the UNSAFE message will be sent. Hence this can be used as a watchdog. Options include "repeat message every second" and "auto-restart when timed out". As well as msg.payload showing "Safe", "Warning" or "Unsafe", there is also msg.countdown showing the remaining time in seconds.
See my other nodes including node-red-contrib-bigtimer. For more IOT, visit https://tech.scargill.net