node-red-nodes/io/wol/39-wol.html

<script type="text/x-red" data-template-name="wake on lan">
    <div class="form-row">
        <label for="node-input-mac"><i class="fa fa-globe"></i> MAC Address</label>
        <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> 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>
        <input type="text" id="node-input-name" placeholder="Name">
    </div>
    <div class="form-tips">Tip: leave blank if you want to use <code>msg.mac</code> or <code>msg.host</code> to dynamically set target mac address.</div>
</script>

<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 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">
    RED.nodes.registerType('wake on lan',{
        category: 'network-output',
        color:"#999966",
        defaults: {
            mac: {value:""},
            host: {value:""},
            name: {value:""}
        },
        inputs:1,
        outputs:0,
        icon: "light.png",
        align: "right",
        label: function() {
            return this.name ? this.name : (this.mac ? "WOL: "+this.mac : "Wake on Lan") ;
        },
        labelStyle: function() {
            return this.name?"node_label_italic":"";
        }
    });
</script>