I don’t have a PIR to test, but looking at the code, I’d suggest trying something like this:
You need a DOM element to show the message in. You can borrow it from the default module helloworld and modify it:
getDom: function() {
var wrapper = document.createElement("div");
wrapper.setAttribute("id", "welcome-message");
wrapper.innerHTML = "";
return wrapper;
}
And then, based on self.sendSocketNotification("USER_PRESENCE", true); in the node_helper.js you add
this to the MMM-PIR-Sensor.js :
socketNotificationReceived: function(notification, payload) {
if (notification === "USER_PRESENCE"){
this.sendNotification(notification, payload)
// new:
if (payload === true) {
document.getElementById("welcome-message").innerHTML = "Welcome back!";
setTimeout(() => {
this.removeMessage();
}, (1*60*1000); // = 60 seconds
}
},
removeMessage: function(payload) {
document.getElementById("welcome-message").innerHTML = "";
}
If you use it like this, the message is only shown for 1 * 60 * 1000 miliseconds = 60 seconds (set as desired) and then removed.
This is all untested but hopefully gives you some clues where to look and work on the code.