Added mqtt pub/sub synch(Paho lib) Future based and Callback/continuation based (Fuse lib)

tools_scripts/fuse_subscriber.groovy

@@ -1,4 +1,4 @@
-@Grab(group='org.fusesource.mqtt-client', module='mqtt-client', version='1.5')
+@Grab(group='org.fusesource.mqtt-client', module='mqtt-client', version='1.10')
 
 import java.net.URISyntaxException
 
@@ -10,6 +10,11 @@ import org.fusesource.mqtt.client.Topic
 import java.util.concurrent.CountDownLatch
 import java.util.concurrent.TimeUnit
 
+if (args.size() != 1) {
+    println "Usage subscriber <host>"
+    return
+}
+
 String host = args[0]
 MQTT mqtt = new MQTT()
 //mqtt.setHost("test.mosquitto.org", 1883);
@@ -48,4 +53,6 @@ long stopTime = System.currentTimeMillis()
 long spentTime = stopTime - startTime
 println "/exit received"
 println "subscriber disconnected, received ${numReceived} messages in ${spentTime} ms"
+double msgPerSec = (numReceived / spentTime) * 1000
+println "speed $msgPerSec msg/sec"