set registers in Flex Server

Added the ability to set any Register in the Flex-Server for development / Slave simulation purpose

src/modbus-flex-server.js

@@ -2,6 +2,7 @@
  Copyright (c) 2017,2018 Klaus Landsdorf (http://bianco-royal.de/)
  All rights reserved.
  node-red-contrib-modbus - The BSD 3-Clause License
+
  @author <a href="mailto:klaus.landsdorf@bianco-royal.de">Klaus Landsdorf</a> (Bianco Royal)
  **/
 /**
@@ -126,19 +127,18 @@ module.exports = function (RED) {
     node.startServer()
 
     node.on('input', function (msg) {
-
         if(    msg.payload.register === 'holding'
             || msg.payload.register === 'coils'
             || msg.payload.register === 'input'
             || msg.payload.register === 'discrete'){
-            
+
             if (!(Number.isInteger(msg.payload.address) &&
                   msg.payload.address >= 0 &&
                   msg.payload.address <= 65535)) {
               node.error('Address Not Valid', msg)
               return
             }
-            switch (type) {
+            switch (msg.payload.register) {
                 case 'holding': 
                     node.registers.writeUInt16BE(msg.payload.value, (msg.payload.address + node.splitAddress) * node.bufferFactor)
                     break
@@ -182,5 +182,4 @@ module.exports = function (RED) {
   } catch (err) {
     internalDebugLog(err.message)
   }
-
-}
+}