use synchronous call to read system time

pool.js

@@ -241,30 +241,24 @@ function update_temp(temp) {
 
   print("[POOL] update_temp - max:", status.temp_max, "today:", status.temp_today, "yesterday:", status.temp_yesterday);
 
-  Shelly.call (
-    "Sys.GetStatus",
-    {},
-    function (result) {
-      let time = result.time; // "HH:MM"
-      print("[POOL] time", time);
+  let time = Shelly.getComponentStatus("sys").time; // "HH:MM"
+  print("[POOL] time", time);
 
-      // compute current time in float format (12h45 -> 12.75)
-      let t = JSON.parse(time.slice(0,2)) + JSON.parse(time.slice(3,5)) / 60;
+  // compute current time in float format (12h45 -> 12.75)
+  let t = JSON.parse(time.slice(0,2)) + JSON.parse(time.slice(3,5)) / 60;
 
-      if (t < status.update_time)
-        update_new_day();
+  if (t < status.update_time)
+    update_new_day();
 
-      status.update_time = t;
+  status.update_time = t;
 
-      if ((status.temp_max !== null) && (status.temp_max !== status.update_temp_max_last)) {
-        update_pump(status.temp, status.temp_max, t);
-        status.update_temp_max_last = status.temp_max;
-      }
-      else {
-        print("[POOL] no temp change, skip update_pump");
-      }
-    }
-  );
+  if ((status.temp_max !== null) && (status.temp_max !== status.update_temp_max_last)) {
+    update_pump(status.temp, status.temp_max, t);
+    status.update_temp_max_last = status.temp_max;
+  }
+  else {
+    print("[POOL] no temp change, skip update_pump");
+  }
 
   status.lock_update = false;
 }
@@ -341,15 +335,10 @@ Timer.set(
   true,
   function() {
     status.tick++;
-    Shelly.call (
-      "Sys.GetStatus",
-      {},
-      function (result) {
-        print("[POOL] tick", result.time);
-        status.time = result.time;
-        status.uptime = result.uptime;
-      }
-    );
+    let result = Shelly.getComponentStatus("sys");
+    print("[POOL] tick", result.time);
+    status.time = result.time;
+    status.uptime = result.uptime;
   }
 );