Added scripted use cases

Minor changes to logging

tools_scripts/publisher_client.groovy

@@ -0,0 +1,26 @@
+@GrabResolver(name='Paho', root='https://repo.eclipse.org/content/repositories/paho-releases/')
+@Grab(group='org.eclipse.paho', module='mqtt-client', version='0.4.0')
+
+import org.eclipse.paho.client.mqttv3.MqttClient
+import org.eclipse.paho.client.mqttv3.MqttMessage
+import org.eclipse.paho.client.mqttv3.MqttException
+import org.eclipse.paho.client.mqttv3.persist.MqttDefaultFilePersistence
+
+String tmpDir = System.getProperty("java.io.tmpdir")
+MqttDefaultFilePersistence dataStore = new MqttDefaultFilePersistence(tmpDir)
+
+MqttClient client = new MqttClient("tcp://localhost:1883", "PublisherClient", dataStore)
+client.connect()
+MqttMessage message = new MqttMessage('Hello world!!'.bytes)
+message.setQos(0)
+print "publishing.."
+long startTime = System.currentTimeMillis()
+(1..1000000).each {
+    client.publish('topic', 'Hello world!!'.bytes, 0, false)
+}
+client.publish('/exit', 'Exit'.bytes, 0, false)
+long stopTime = System.currentTimeMillis()
+long spentTime = stopTime -startTime
+println "published in ${spentTime} ms"
+client.disconnect()
+println "disconnected"