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<page xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_configuration.xsd">
    <head>
        <css src="css/mystyle.css" />
        <script src="http://{myipaddress}:35729/livereload.js" src_type="url"></script>
    </head>
</page>

<referenceContainer name="after.body.start">
  <block class="MyvendorMythemeBlockJsLivereload" name="livereload-config" template="Myvendor_Mytheme::js/livereload.phtml"/>
</referenceContainer>