Add support for different statistic counters

html/stat.js

@@ -23,4 +23,21 @@ function fillStats() {
   }
 }
 
+function getCounts() {
+  for (let port = 1; port <= numPorts; port++) {
+    var xhttp = new XMLHttpRequest();
+    xhttp.onreadystatechange = function() {
+      if (this.readyState == 4 && this.status == 200) {
+        const s = JSON.parse(xhttp.responseText);
+        console.log("Counters: ", JSON.stringify(s));
+      }
+    }
+    xhttp.open("GET", `/counters.json?port=${port}`, true);
+    xhttp.send();
+  }
+}
+
+window.addEventListener("load", function() {
+  const iCount = setInterval(getCounts, 1000);
+});
 const stat = setInterval(fillStats, 500);