Update Paho MQTT client library dependency version to 1.2.3+ because of the keep-alive bug

[ikarsokolov]

Current Behavior
org.eclipse.paho:org.eclipse.paho.client.mqttv3 dependency versions is 1.2.2.

Context
Paho MQTT client version 1.2.2 has nasty bug that can result in ping packet being sent to server every millisecond regardless of the configuration. eclipse-paho/paho.mqtt.java#738

Version 1.2.4 seems to work fine.

[artembilan]

Sure! Feel free to raise a Pull Request on the matter: https://github.com/spring-projects/spring-integration/blob/master/CONTRIBUTING.adoc.

Be sure that you have an MQTT broker locally on 1883 port to run all our test with your fix.

Thank you!

[ikarsokolov]

I can't make unit tests pass on master branch. BackToBackAdapterTests.testAddRemoveTopic() fails with mosquitto 1.6.9 as local broker.

ERROR [main] [org.springframework.integration.mqtt.inbound.MqttPahoMessageDrivenChannelAdapter] - Error connecting or subscribing to []
org.eclipse.paho.client.mqttv3.MqttException: Connection lost
	at org.eclipse.paho.client.mqttv3.internal.CommsReceiver.run(CommsReceiver.java:190) ~[org.eclipse.paho.client.mqttv3-1.2.2.jar:?]
	at java.lang.Thread.run(Thread.java:834) ~[?:?]
Caused by: java.io.EOFException
	at java.io.DataInputStream.readByte(DataInputStream.java:272) ~[?:?]
	at org.eclipse.paho.client.mqttv3.internal.wire.MqttInputStream.readMqttWireMessage(MqttInputStream.java:92) ~[org.eclipse.paho.client.mqttv3-1.2.2.jar:?]
	at org.eclipse.paho.client.mqttv3.internal.CommsReceiver.run(CommsReceiver.java:137) ~[org.eclipse.paho.client.mqttv3-1.2.2.jar:?]
	... 1 more

All other test passes. A am not sure where to look for the problem.

[artembilan]

Let me check it locally with MQTT plugin in RabbitMQ!

[artembilan]

Works well. So, probably some Mosquitto incompatibility issue.

Pushing the upgrade...

Thanks for your contribution!