show please wait message on room server boot

examples/simple_room_server/main.cpp

@@ -846,6 +846,14 @@ void setup() {
 
   board.begin();
 
+#ifdef DISPLAY_CLASS
+  if(display.begin()){
+    display.startFrame();
+    display.print("Please wait...");
+    display.endFrame();
+  }
+#endif
+
   if (!radio_init()) { halt(); }
 
   fast_rng.begin(radio_get_rng_seed());
@@ -875,7 +883,6 @@ void setup() {
   the_mesh.begin(fs);
 
 #ifdef DISPLAY_CLASS
-  display.begin();
   ui_task.begin(the_mesh.getNodeName(), FIRMWARE_BUILD_DATE);
 #endif