added arduino, modified build

arduino/libraries/GSM/examples/Tools/TestModem/TestModem.ino

@@ -0,0 +1,70 @@
+/*
+
+ This example tests to see if the modem of the
+ GSM shield is working correctly. You do not need
+ a SIM card for this example.
+
+ Circuit:
+ * GSM shield attached
+
+ Created 12 Jun 2012
+ by David del Peral
+ modified 21 Nov 2012
+ by Tom Igoe
+
+ http://www.arduino.cc/en/Tutorial/GSMToolsTestModem
+
+ This sample code is part of the public domain
+
+ */
+
+// libraries
+#include <GSM.h>
+
+// modem verification object
+GSMModem modem;
+
+// IMEI variable
+String IMEI = "";
+
+void setup() {
+  // initialize serial communications and wait for port to open:
+  Serial.begin(9600);
+  while (!Serial) {
+    ; // wait for serial port to connect. Needed for Leonardo only
+  }
+
+  // start modem test (reset and check response)
+  Serial.print("Starting modem test...");
+  if (modem.begin()) {
+    Serial.println("modem.begin() succeeded");
+  } else {
+    Serial.println("ERROR, no modem answer.");
+  }
+}
+
+void loop() {
+  // get modem IMEI
+  Serial.print("Checking IMEI...");
+  IMEI = modem.getIMEI();
+
+  // check IMEI response
+  if (IMEI != NULL) {
+    // show IMEI in serial monitor
+    Serial.println("Modem's IMEI: " + IMEI);
+    // reset modem to check booting:
+    Serial.print("Resetting modem...");
+    modem.begin();
+    // get and check IMEI one more time
+    if (modem.getIMEI() != NULL) {
+      Serial.println("Modem is functoning properly");
+    } else {
+      Serial.println("Error: getIMEI() failed after modem.begin()");
+    }
+  } else {
+    Serial.println("Error: Could not get IMEI");
+  }
+  // do nothing:
+  while (true);
+}
+