added the MailboxReadMessage example for the Yun

Author: Fede85

libraries/Bridge/examples/MailboxReadMessage/MailboxReadMessage.ino

@@ -0,0 +1,60 @@
+/*
+  Read Messages from the Mailbox
+
+ This example for the Arduino Yún sdemonstrate how to
+ read the messages queue, called Mailbox using the
+ Bridge library.
+ The messages can be sent to the queue through REST calls.
+ Appen the message in the URL after the keyword "/mailbox".
+ Example
+
+ "/mailbox/hello"
+
+ created 3 Feb 2014
+ by Federico Vanzati & Federico Fissore
+
+ This example code is in the public domain.
+
+ http://arduino.cc/en/Tutorial/MailboxReadMessage
+
+ */
+
+#include <Mailbox.h>
+
+void setup() {
+  pinMode(13, OUTPUT);
+  digitalWrite(13, LOW);
+  // Initialize Bridge and Mailbox
+  Bridge.begin();
+  Mailbox.begin();
+  digitalWrite(13, HIGH);
+
+  // Initialize Serial
+  Serial.begin(9600);
+
+  // Wait until a Serial Monitor is connected.
+  while (!Serial);
+
+  Serial.println("Mailbox Read Message\n");
+  Serial.println("The Mailbox is checked every 10 seconds. The incoming messages will be shown below.\n");
+}
+
+void loop() {
+  String message;
+
+  // if there is a message in the Mailbox
+  if (Mailbox.messageAvailable())
+  {
+    // read all the messages present in the queue
+    while (Mailbox.messageAvailable())
+    {
+      Mailbox.readMessage(message);
+      Serial.println(message);
+    }
+
+    Serial.println("Waiting 10 seconds before checking the Mailbox again");
+  }
+
+  // wait 10 seconds
+  delay(10000);
+}