use detected version when decrypting

Author: Apollon77

lib/cipher.js

@@ -112,17 +112,19 @@ class TuyaCipher {
   }
 
   /**
-  * Decrypts data.
-  * @param {String|Buffer} data to decrypt
-  * @returns {Object|String}
-  * returns object if data is JSON, else returns string
-  */
-  decrypt(data) {
-    if (this.version === '3.4') {
+   * Decrypts data.
+   * @param {String|Buffer} data to decrypt
+   * @param {String} [version] protocol version
+   * @returns {Object|String}
+   * returns object if data is JSON, else returns string
+   */
+  decrypt(data, version) {
+    version = version || this.version;
+    if (version === '3.4') {
       return this._decrypt34(data);
     }
 
-    if (this.version === '3.5') {
+    if (version === '3.5') {
       return this._decrypt35(data);
     }
 

lib/message-parser.js

@@ -250,7 +250,7 @@ class MessageParser {
         throw new Error('Missing key or version in constructor.');
       }
 
-      data = this.cipher.decrypt(data);
+      data = this.cipher.decrypt(data, version);
     } catch (_) {
       data = data.toString('utf8');
     }