Add MQTT Sample

* Move `ftp` `log4j` dependency to the `testCompile` configuration
* Regenerate POM for MQTT sample

basic/mqtt/README.md

@@ -0,0 +1,29 @@
+Spring Integration - MQTT Sample
+================================
+
+# Overview
+
+This sample demonstrates basic functionality of the **Spring Integration MQTT Adapters**.
+
+It assumes a broker is running on localhost on port 1883.
+
+Once the application is started, you enter some text on the command prompt and a message containing that entered text is
+dispatched to the MQTT topic. In return that message is retrieved by Spring Integration and then logged.
+
+# How to Run the Sample
+
+If you imported the example into your IDE, you can just run class **org.springframework.integration.samples.mqtt.Application**.
+For example in [SpringSource Tool Suite](http://www.springsource.com/developer/sts) (STS) do:
+
+* Right-click on SampleSimple class --> Run As --> Spring Boot App
+
+(or run from the boot console).
+
+Alternatively, you can start the sample from the command line:
+
+* ./gradlew :mqtt:run
+
+Enter some data (e.g. `foo`) on the console; you will see `foo sent to MQTT, received from MQTT`
+
+Ctrl-C to terminate.
+