Tidy up more api and examples

PubSubClient/examples/mqtt_basic/mqtt_basic.ino

@@ -1,9 +1,16 @@
 /*
  Basic MQTT example
 
-  - connects to an MQTT server
+ This sketch demonstrates the basic capabilities of the library.
+ It connects to an MQTT server then:
   - publishes "hello world" to the topic "outTopic"
-  - subscribes to the topic "inTopic"
+  - subscribes to the topic "inTopic", printing out any messages
+    it receives. NB - it assumes the received payloads are strings not binary
+
+ It will reconnect to the server if the connection is lost using a blocking
+ reconnect function. See the 'mqtt_reconnect_nonblocking' example for how to
+ achieve the same result without blocking the main loop.
+ 
 */
 
 #include <SPI.h>
@@ -16,22 +23,55 @@ IPAddress ip(172, 16, 0, 100);
 IPAddress server(172, 16, 0, 2);
 
 void callback(char* topic, byte* payload, unsigned int length) {
-  // handle message arrived
+  Serial.print("Message arrived [");
+  Serial.print(topic);
+  Serial.print("] ");
+  for (int i=0;i<length;i++) {
+    Serial.print((char)payload[i]);
+  }
+  Serial.println();
 }
 
 EthernetClient ethClient;
-PubSubClient client(server, 1883, callback, ethClient);
+PubSubClient client(ethClient);
+
+void reconnect() {
+  // Loop until we're reconnected
+  while (!client.connected()) {
+    Serial.print("Attempting MQTT connection...");
+    // Attempt to connect
+    if (client.connect("arduinoClient")) {
+      Serial.println("connected");
+      // Once connected, publish an announcement...
+      client.publish("outTopic","hello world");
+      // ... and resubscribe
+      client.subscribe("inTopic");
+    } else {
+      Serial.print("failed, rc=");
+      Serial.print(client.state());
+      Serial.println(" try again in 5 seconds");
+      // Wait 5 seconds before retrying
+      delay(5000);
+    }
+  }
+}
 
 void setup()
 {
+  Serial.begin(57600);
+
+  client.setServer(server, 1883);
+  client.setCallback(callback);
+
   Ethernet.begin(mac, ip);
-  if (client.connect("arduinoClient")) {
-    client.publish("outTopic","hello world");
-    client.subscribe("inTopic");
-  }
+  // Allow the hardware to sort itself out
+  delay(1500);
 }
 
 void loop()
 {
+  if (!client.connected()) {
+    reconnect();
+  }
   client.loop();
 }