Hi @tuanhiep i am trying the plugin step by step with installation process but i get this:

2015/04/16 16:39:35 ERROR - jmeter.threads.JMeterThread: Test failed! java.lang.NumberFormatException: For input string: ""
at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
at java.lang.Integer.parseInt(Integer.java:504)
at java.lang.Integer.parseInt(Integer.java:527)
at org.apache.jmeter.protocol.mqtt.client.MqttPublisher.setupTest(MqttPublisher.java:73)
at org.apache.jmeter.protocol.mqtt.sampler.PublisherSampler.threadStarted(PublisherSampler.java:419)
at org.apache.jmeter.threads.JMeterThread$ThreadListenerTraverser.addNode(JMeterThread.java:610)
at org.apache.jorphan.collections.HashTree.traverseInto(HashTree.java:998)
at org.apache.jorphan.collections.HashTree.traverse(HashTree.java:980)
at org.apache.jmeter.threads.JMeterThread.threadStarted(JMeterThread.java:579)
at org.apache.jmeter.threads.JMeterThread.initRun(JMeterThread.java:567)
at org.apache.jmeter.threads.JMeterThread.run(JMeterThread.java:257)
at java.lang.Thread.run(Thread.java:745)

I did all the steps for installation, and i am trying to publish, what am i missing thanks