Set WOL node to use more generic broadcast address byt default

Author: Dave Conway-Jones

io/wol/39-wol.html

@@ -5,8 +5,8 @@
         <input type="text" id="node-input-mac" placeholder="e.g. DE:AD:BE:EF:FE:ED">
     </div>
     <div class="form-row">
-        <label for="node-input-host"><i class="fa fa-globe"></i> Host Address</label>
-        <input type="text" id="node-input-host" placeholder="e.g. 255.255.255.255">
+        <label for="node-input-host"><i class="fa fa-globe"></i> Target Address</label>
+        <input type="text" id="node-input-host" placeholder="e.g. 192.168.1.255 or 10.255.255.255">
     </div>
     <div class="form-row">
         <label for="node-input-name"><i class="fa fa-tag"></i> Name</label>
@@ -18,7 +18,9 @@
 <script type="text/x-red" data-help-name="wake on lan">
     <p>Sends a Wake-On-LAN magic packet to the mac address specified.</p>
     <p>You may instead set <code>msg.mac</code> to dynamically set the target device mac to wake up.</p>
-    <p>The target host address can optionally be set using <code>msg.host</code></p>
+    <p>The address of the target machine can optionally be set using <code>msg.host</code></p>
+    <p>Setting the target address to the broadcast address of the subnet that the target machine is attached to works best.
+    For a class C address this is usually just the first three parts of the ip address followed by 255. eg 192.168.1.255.</p>
 </script>
 
 <script type="text/javascript">

io/wol/39-wol.js

@@ -13,6 +13,10 @@ module.exports = function(RED) {
         this.on("input", function(msg) {
             var mac = this.mac || msg.mac || null;
             var host = this.host || msg.host || '255.255.255.255';
+            var h = host.split('.');
+            h.pop();
+            h.push('255');
+            host = h.join('.');
             if (mac != null) {
                 if (chk.test(mac)) {
                     try {
@@ -35,7 +39,7 @@ module.exports = function(RED) {
             }
             else { node.warn("WOL: no mac address specified"); }
         });
-        
+
         this.on("close", function () {
             node.status({});
         })

io/wol/package.json

@@ -1,6 +1,6 @@
 {
     "name"          : "node-red-node-wol",
-    "version"       : "0.0.9",
+    "version"       : "0.0.10",
     "description"   : "A Node-RED node to send Wake-On-LAN (WOL) magic packets",
     "dependencies"  : {
         "wake_on_lan"   : "1.0.0"