Node-RED block in Snap4City Microservice library node-red-contrib-snap4city-milestone is "x-send-event">
    <p>With this node you can send an event to the event server and trigger an Alarm with the possibility to activate a rule associated with it.
    </p>
    
    <h3>Inputs</h3>
    <p>A JSON with these parameters:</p>
    
    <dl class="message-properties">
       <dt>name
           <span class="property-type">string</span>
       </dt>
       <dd>The name of the event which will be send and trigger. The event must exist in the VMS. <b>(mandatory)</b></dd>
       
       <dt>guid
           <span class="property-type">string</span>
       </dt>
       <dd>The Guid associated with a hardware device in the Milestone VMS(e.g. Camera, Microphone). Device must be registered. <b>(mandatory)</b></dd>
       
       <dt>hostname
            <span class="property-type">string</span>
       </dt>
       <dd>The hostname where the Milestone VMS runs on. Only http or https are allowed(default localhost). <b>(mandatory)</b></dd>

       <dt>port
            <span class="property-type">number</span>
       </dt>
       <dd>The port that allows send analytics events to the VMS, which must be activated(default 9090). Check the XProtect documentation for more details. <b>(mandatory)</b></dd>
       
       <dt>Description
        <span class="property-type">string</span>
       </dt>
       <dd>A short description of the event which will be send. If it's generated from Snap4City will contain name, GPS position, severity, impact etc.. (optional)</dd>
    </dl>

    <h3>Outputs</h3>
    <p>A JSON object with these parameters:</p>

     <dl class="message-properties">
        <dt>messagge
            <span class="property-type">string</span>
        </dt>
        <dd>The result of the send operation to VMS, with any error</dd>
     </dl>

    <h3>Example of JSON output if the opreation is correct:</h3>
    <dl class="exampleJson">
        <dd>
        <pre>
{
    message: "OK Event sent correctly"
}
        </pre>
        </dd>
    </dl>

    <h3>Example of JSON output if operation goes wrong:</h3>
    <dl class="exampleJson">
        <dd>
        <pre>
{
    message: "Connection error: TypeError[ERR_INVALID_URL]:Invalid URL:http://wrongaddress:9090"
}
        </pre>
        </dd>
    </dl>

    <h3>Details</h3>
     <p>The node can receive the parameters described in the Inputs section, with them generates a XML file readable from the event server, and with server response 
        generates the output JSON. If the values are not present in the input JSON, these are read by those in the node properties. If they are not present 
        in either part or are wrong, an error is generated for the necessary parameters or the reason why are not correct.</p>