Change state object creation logic

Also added object compare function `objectEquals`

lib/utils.js

@@ -41,10 +41,42 @@ function fetchHashOfString(string) {
     return string.split('').map(v=>v.charCodeAt(0)).reduce((a,v)=>a+((a<<7)+(a<<3))^v).toString(16);
 };
 
+/*  */
+function objectEquals(x, y) {
+    'use strict';
+
+    if (x === null || x === undefined || y === null || y === undefined) return x === y;
+
+    // after this just checking type of one would be enough
+    if (x.constructor !== y.constructor) return false;
+
+    // if they are functions, they should exactly refer to same one (because of closures)
+    if (x instanceof Function) return x === y;
+
+    // if they are regexps, they should exactly refer to same one (it is hard to better equality check on current ES)
+    if (x instanceof RegExp) return x === y;
+
+    if (x === y || x.valueOf() === y.valueOf()) return true;
+    if (Array.isArray(x) && x.length !== y.length) return false;
+
+    // if they are dates, they must had equal valueOf
+    if (x instanceof Date) return false;
+
+    // if they are strictly equal, they both need to be object at least
+    if (!(x instanceof Object)) return false;
+    if (!(y instanceof Object)) return false;
+
+    // recursive object equality check
+    var p = Object.keys(x);
+    return Object.keys(y).every(i => p.indexOf(i) !== -1) &&
+        p.every(i => objectEquals(x[i], y[i]));
+}
+
 /*  */
 module.exports = {
     sleep,
     reverseMac,
     decodeMiioJson,
-    fetchHashOfString
+    fetchHashOfString,
+    objectEquals
 };

main.js

@@ -12,7 +12,7 @@ const format = require('date-fns/format');
 /* */
 const yaml = require('js-yaml');
 /* */
-const {fetchHashOfString} = require('./lib/utils');
+const {fetchHashOfString, objectEquals} = require('./lib/utils');
 /* */
 const {MiioHelper, Gateway3Helper} = require('./lib/helpers');
 const XiaomiCloud = require('./lib/xiaomiCloud');
@@ -606,11 +606,15 @@ class XiaomiGateway3 extends utils.Adapter {
                 }
             }
 
-            /* set state object */
-            await this.setObjectAsync(_id, Object.assign({},
-                {'_id': `${this.namespace}.${_id}`},
-                stateObject
-            ));
+            /* set state object if it is not exist or `custom` changed */
+            if (_stateObject == undefined
+                || !objectEquals(stateObject.common.custom[this.namespace], _stateObject.common.custom[this.namespace])
+            ) {
+                await this.setObjectAsync(_id, Object.assign({},
+                    {'_id': `${this.namespace}.${_id}`},
+                    stateObject
+                ));
+            }
 
             /* set init state value if it is exist */
             const val = init[stateName];