added apicheck file

static-data/www/shared/main/apicheck.js

@@ -0,0 +1,27 @@
+apiOnline = true
+async function doPing(){
+    out = setTimeout(function(){
+        if (apiOnline){
+        PNotify.notice('Connection lost with API server')
+        }
+        apiOnline = false
+    }, 1000)
+return await fetch('/ping', {
+    headers: {
+        "token": webpass
+    }})
+    .then((resp) => resp.text()) // Transform the data into text
+    .then(function(resp) {
+        if (!apiOnline){PNotify.success('API server connection reestablished')}
+        apiOnline = true
+        clearTimeout(out)
+        return resp
+    })
+}
+
+let pingCheck = async function(){
+    result = await doPing()
+
+}
+
+pingCheckInterval = setInterval(function(){pingCheck()}, 3000)