From 910111abc6b27b2dbf2d9ef22d1ff0bf3c00238f Mon Sep 17 00:00:00 2001
From: Mimmo La Fauci <mlafauci@metodo2.it>
Date: Sat, 26 May 2012 12:06:14 +0200
Subject: [PATCH] Added check in case of shield not present

---
 WiFi/examples/ScanNetworks/ScanNetworks.ino | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/WiFi/examples/ScanNetworks/ScanNetworks.ino b/WiFi/examples/ScanNetworks/ScanNetworks.ino
index 2c10fed33..7ff9410e3 100644
--- a/WiFi/examples/ScanNetworks/ScanNetworks.ino
+++ b/WiFi/examples/ScanNetworks/ScanNetworks.ino
@@ -61,7 +61,12 @@ void printMacAddress() {
 void listNetworks() {
   // scan for nearby networks:
   Serial.println("** Scan Networks **");
-  byte numSsid = WiFi.scanNetworks();
+  int numSsid = WiFi.scanNetworks();
+  if (numSsid == -1)
+  { 
+    Serial.println("Couldn't get a wifi connection");
+    while(true);
+  } 
 
   // print the list of networks seen:
   Serial.print("number of available networks:");