Added SinaglR

Server/wwwroot/css/site.css

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+html {
+  font-size: 14px;
+}
+
+@media (min-width: 768px) {
+  html {
+    font-size: 16px;
+  }
+}
+
+.btn:focus, .btn:active:focus, .btn-link.nav-link:focus, .form-control:focus, .form-check-input:focus {
+  box-shadow: 0 0 0 0.1rem white, 0 0 0 0.25rem #258cfb;
+}
+
+html {
+  position: relative;
+  min-height: 100%;
+}
+
+body {
+  margin-bottom: 60px;
+}

Server/wwwroot/js/notification.js

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+"use strict";
+
+var connection = new signalR.HubConnectionBuilder().withUrl("/NotificationHub").build();
+
+connection.on("NotifyAll", function (data) {
+    var message = `${data.keyPressEvent.dateTime} - [${data.lastScanServiceResultValue}]`;
+    document.getElementById("data").innerText = message;
+});
+
+connection.start().then(function () {
+}).catch(function (err) {
+    return console.error(err.toString());
+});

Server/wwwroot/js/site.js

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+