"new Buffer" --> "Buffer.from"

excel.js

 /**
  * @author Rolf Niepraschk (Rolf.Niepraschk@ptb.de)
- * version: 2019-01-25
+ * version: 2020-04-29
  */
 
 var cfg = require('./config.js');
@@ -62,7 +62,8 @@ function fromXLSX(pRef, js) {
   try {
     logger.debug('Value.length: ', js.Value.length);
     utils.addStartTime(js);
-    var data = xlsx.parse(new Buffer(js.Value, 'base64'));
+    //var data = xlsx.parse(new Buffer(js.Value, 'base64'));
+    var data = xlsx.parse(Buffer.from(js.Value, 'base64'));
     utils.addStopTime(js);
     var short = (typeof js.ShortFormat == 'boolean') ? js.ShortFormat : true;
     //response.prepareResult(pRef, js, short ? simplify(data) : data);

external.js

 /**
  * @author Rolf Niepraschk (Rolf.Niepraschk@ptb.de)
- * version: 2019-01-25
+ * version: 2020-04-29
  */
 
 var exec = require('child_process').exec;
@@ -73,7 +73,8 @@ function call(pRef, js, postFunc) {
           var res;
 
           if (js.OutputEncoding == 'binary') {
-            res = new Buffer(stdout, 'binary');
+            //res = new Buffer(stdout, 'binary');
+            res = Buffer.from(stdout, 'binary');
           } else {
             res = stdout;
           }

udp.js

 /**
  * @author Rolf Niepraschk (Rolf.Niepraschk@ptb.de)
- * version: 2019-01-25
+ * version: 2020-04-29
  */
 
 var cfg = require('./config.js');
@@ -20,7 +20,8 @@ var logger = cfg.logger;
 function call(pRef, js) {
   function doIt(b, next) {
     var host = js.Host, port = tools.getInt(js.Port);
-    var buf = new Buffer((js.Value) ? js.Value : '');
+    //var buf = new Buffer((js.Value) ? js.Value : '');
+    var buf = Buffer.from(js.Value ? js.Value : '');
     var timeout = tools.getInt(js.Timeout, cfg.DEFAULT_UDP_TIMEOUT);
     var client = dgram.createSocket('udp4');