node-red/nodes/core/io/10-mqtt.html

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<script type="text/x-red" data-template-name="mqtt in">
    <div class="form-row">
        <label for="node-input-broker"><i class="icon-tag"></i> Broker</label>
        <input type="text" id="node-input-broker">
    </div>
    <div class="form-row">
        <label for="node-input-topic"><i class="icon-tasks"></i> Topic</label>
        <input type="text" id="node-input-topic" placeholder="Topic">
    </div>
    <div class="form-row">
        <label for="node-input-name"><i class="icon-tag"></i> Name</label>
        <input type="text" id="node-input-name" placeholder="Name">
    </div>
</script>

<script type="text/x-red" data-help-name="mqtt in">
	<p>MQTT input node. Connects to the specified broker and subscribes to the specified topic. The topic may contain MQTT wildcards.</p>
	<p>Outputs an object called <b>msg</b> containing <b>msg.topic, msg.payload, msg.qos</b> and <b>msg.retain</b>. <b>msg.payload</b> is a String.</p>
</script>

<script type="text/javascript">
    RED.nodes.registerType('mqtt in',{
        category: 'input',
        defaults: {
            name: {value:""},
            topic: {value:"",required:true},
            broker: {type:"mqtt-broker", required:true}
        },
        color:"#c6dbef",
        inputs:0,
        outputs:1,
        icon: "bridge.png",
        label: function() {
            return this.name||this.topic||"mqtt";
        },
        labelStyle: function() {
            return this.name?"node_label_italic":"";
        }
    });
</script>

<script type="text/x-red" data-template-name="mqtt out">
    <div class="form-row">
        <label for="node-input-broker"><i class="icon-tag"></i> Broker</label>
        <input type="text" id="node-input-broker">
    </div>
    <div class="form-row">
        <label for="node-input-topic"><i class="icon-tasks"></i> Topic</label>
        <input type="text" id="node-input-topic" placeholder="Topic">
    </div>
    <div class="form-row">
        <label for="node-input-name"><i class="icon-tag"></i> Name</label>
        <input type="text" id="node-input-name" placeholder="Name">
    </div>
</script>

<script type="text/x-red" data-help-name="mqtt out">
	<p>Connects to a MQTT broker and publishes <b>msg.payload</b> either to the <b>msg.topic</b> OR to the topic specified in the edit window. The value in the edit window has precedence.</p>
	<p><b>msg.qos</b> and <b>msg.retain</b> may also optionally have been set. If not set they are set to 0 and false respectively.</p>
	<p>If <b>msg.payload</b> contains a buffer or an object it will be stringified before being sent.</p>
</script>

<script type="text/javascript">
    RED.nodes.registerType('mqtt out',{
        category: 'output',
        defaults: {
            name: {value:""},
            topic: {value:""},
            broker: {type:"mqtt-broker", required:true}
        },
        color:"#c6dbef",
        inputs:1,
        outputs:0,
        icon: "bridge.png",
        align: "right",
        label: function() {
            return this.name||this.topic||"mqtt";
        },
        labelStyle: function() {
            return this.name?"node_label_italic":"";
        }
    });
</script>

<script type="text/x-red" data-template-name="mqtt-broker">
    <div class="form-row node-input-broker">
        <label for="node-config-input-broker"><i class="icon-bookmark"></i> Broker</label>
        <input class="input-append-left" type="text" id="node-config-input-broker" placeholder="Broker" style="width: 40%;" >
        <label for="node-config-input-port" style="margin-left: 10px; width: 35px; "> Port</label>
        <input type="text" id="node-config-input-port" placeholder="Port" style="width:45px">
    </div>
</script>

<script type="text/javascript">
    RED.nodes.registerType('mqtt-broker',{
        category: 'config',
        defaults: {
            broker: {value:"localhost",required:true},
            port: {value:1883,required:true,validate:RED.validators.number()}
        },
        label: function() {
            return this.broker+":"+this.port;
        }
    });
</script>