diff --git a/main.lua b/main.lua
index 4ca1b1b..041c85a 100644
--- a/main.lua
+++ b/main.lua
@@ -59,19 +59,20 @@ function displayTime()
             invertRows=true
         end
         local c = dw.countChars(words)
-        ledBuf = dw.generateLEDs(rgbBuffer, words, colorBg, color, color1, color2, color3, color4, invertRows, c)
+        dw.generateLEDs(rgbBuffer, words, colorBg, color, color1, color2, color3, color4, invertRows, c)
      end
      dw = nil
      collectgarbage()
      print("dw: " .. tostring(node.heap()))
-     if (ledBuf ~= nil) then
-     	  ws2812.write(ledBuf)
+     if (rgbBuffer ~= nil) then
+     	  ws2812.write(rgbBuffer)
      else
 	  -- set FG to fix value: RED
 	  local color = string.char(255,0,0)
 	  rgbBuffer:fill(0,0,0) -- disable all LEDs
 	  for i=108,110, 1 do rgbBuffer:set(i, color) end
 	  ws2812.write(rgbBuffer)
+	  print("Fallback no time displayed")
      end
      
      -- cleanup
@@ -95,6 +96,7 @@ function normalOperation()
     local alive=0
     mlt:register(2500, tmr.ALARM_AUTO, function (lt)
       if (setupCounter > 4) then
+	rgbBuffer:fill(0,0,0) -- disable all LEDs
         syncTimeFromInternet()
         setupCounter=setupCounter-1
         alive = 1
@@ -159,6 +161,9 @@ function normalOperation()
         wifitimer=nil
         connect_counter=nil
         print('IP: ',wifi.sta.getip(), " heap: ", node.heap())
+         rgbBuffer:fill(0,0,0) -- clear all LEDs
+	 rgbBuffer:set(13, color)
+	 ws2812.write(rgbBuffer)
         mlt:start()
       end
     end)
diff --git a/simulation/src/de/c3ma/ollo/mockup/ESP8266Ws2812.java b/simulation/src/de/c3ma/ollo/mockup/ESP8266Ws2812.java
index 1902935..f95cd1a 100644
--- a/simulation/src/de/c3ma/ollo/mockup/ESP8266Ws2812.java
+++ b/simulation/src/de/c3ma/ollo/mockup/ESP8266Ws2812.java
@@ -5,6 +5,7 @@ import java.io.File;
 
 import javax.swing.SwingUtilities;
 
+import org.luaj.vm2.LuaNil;
 import org.luaj.vm2.LuaString;
 import org.luaj.vm2.LuaTable;
 import org.luaj.vm2.LuaValue;
@@ -162,10 +163,12 @@ public class ESP8266Ws2812 extends TwoArgFunction {
 	private class bufferWrite extends VarArgFunction {
     	
         public Varargs invoke(Varargs varargs) {
-            if (varargs.narg() == 2) {
-                final int index = varargs.arg(1).toint();
-                final LuaString color = varargs.arg(2).checkstring();
-				final int length = color.rawlen();
+            if (varargs.narg() == 3) {
+                final int index = varargs.arg(2).toint();
+                
+                
+                final LuaString color = varargs.arg(3).checkstring();
+ 				final int length = color.rawlen();
 				if (length == 3) {
 					SwingUtilities.invokeLater(new Runnable() {
 						@Override
@@ -177,10 +180,17 @@ public class ESP8266Ws2812 extends TwoArgFunction {
 							ESP8266Ws2812.layout.updateLED(index, r, g, b);
 						}
 					});
+	                return LuaValue.valueOf(true);
+				} else {
+					for(int i=0; i <= varargs.narg(); i++) {
+						System.err.println("[WS2812] write ["+(i) + "] (" + varargs.arg(i).typename() + ") " + varargs.arg(i).toString() );
+					}
+					
+					System.err.println("[WS2812] set with " + varargs.narg() + " arguments at index="+ index + " and "+ length + " charactes not matching");
+	            	return LuaValue.NIL;	
 				}
-                
-                return LuaValue.valueOf(true);
             } else {
+            	System.err.println("[WS2812] set with " + varargs.narg() + " arguments undefined.");
             	return LuaValue.NIL;
             }
         }