Remove last_seen from state when last_seen is disabled. https://github.com/Koenkk/zigbee2mqtt/issues/1075

lib/state.js

@@ -1,6 +1,7 @@
 const logger = require('./util/logger');
 const data = require('./util/data');
 const fs = require('fs');
+const settings = require('./util/settings');
 
 const saveInterval = 1000 * 60 * 5; // 5 minutes
 
@@ -9,6 +10,8 @@ class State {
         this.state = {};
         this.file = data.joinPath('state.json');
         this.timer = null;
+
+        this.handleSettingsChanged = this.handleSettingsChanged.bind(this);
     }
 
     start() {
@@ -17,6 +20,27 @@ class State {
         // Save the state on every interval
         this.clearTimer();
         this.timer = setInterval(() => this.save(), saveInterval);
+
+        // Listen for on settings changed events.
+        settings.addOnChangeHandler(this.handleSettingsChanged);
+
+        this.checkLastSeen();
+    }
+
+    handleSettingsChanged() {
+        this.checkLastSeen();
+    }
+
+    checkLastSeen() {
+        if (settings.get().advanced.last_seen === 'disable') {
+            Object.values(this.state).forEach((s) => {
+                if (s.hasOwnProperty('last_seen')) {
+                    delete s.last_seen;
+                }
+            });
+
+            this.save();
+        }
     }
 
     clearTimer() {

lib/util/settings.js

@@ -5,6 +5,8 @@ const file = data.joinPath('configuration.yaml');
 const objectAssignDeep = require(`object-assign-deep`);
 const path = require('path');
 
+const onChangeHandlers = [];
+
 const defaults = {
     permit_join: false,
     mqtt: {
@@ -65,6 +67,7 @@ let settings = read();
 function writeRead() {
     write();
     settings = read();
+    onChangeHandlers.forEach((handler) => handler());
 }
 
 function write() {
@@ -173,4 +176,6 @@ module.exports = {
     getGroupIDByFriendlyName: (friendlyName) => getGroupIDByFriendlyName(friendlyName),
     changeFriendlyName: (old, new_) => changeFriendlyName(old, new_),
     changeDeviceOptions: (ieeeAddr, options) => changeDeviceOptions(ieeeAddr, options),
+
+    addOnChangeHandler: (handler) => onChangeHandlers.push(handler),
 };