2014-10-10 14:43:34,115 WARN ActiveMQ BrokerService[broker] Task-1 - Async error occurred:
javax.jms.JMSException: Unmatched acknowledge: MessageAck {commandId = 0, responseRequired = false, ackType = 2, consumerId = ID:mac.fritz.box-62188-1412945008667-1:3:-1:1, firstMessageId = null, lastMessageId = ID:mac.fritz.box-62188-1412945008667-1:2:-1:1:2, destination = topic://mqtt-test.a.b.c, transactionId = null, messageCount = 1, poisonCause = null}; Expected message count (1) differs from count in dispatched-list (2)
	at org.apache.activemq.broker.region.PrefetchSubscription.assertAckMatchesDispatched(PrefetchSubscription.java:488)
	at org.apache.activemq.broker.region.PrefetchSubscription.acknowledge(PrefetchSubscription.java:212)
	at org.apache.activemq.broker.region.AbstractRegion.acknowledge(AbstractRegion.java:412)
	at org.apache.activemq.broker.region.RegionBroker.acknowledge(RegionBroker.java:466)
	at org.apache.activemq.broker.BrokerFilter.acknowledge(BrokerFilter.java:87)
	at org.apache.activemq.broker.TransactionBroker.acknowledge(TransactionBroker.java:277)
	at org.apache.activemq.broker.MutableBrokerFilter.acknowledge(MutableBrokerFilter.java:97)
	at org.apache.activemq.broker.TransportConnection.processMessageAck(TransportConnection.java:550)
	at org.apache.activemq.command.MessageAck.visit(MessageAck.java:245)
	at org.apache.activemq.broker.TransportConnection.service(TransportConnection.java:334)
	at org.apache.activemq.broker.TransportConnection$1.onCommand(TransportConnection.java:188)
	at org.apache.activemq.transport.MutexTransport.onCommand(MutexTransport.java:45)
	at org.apache.activemq.transport.mqtt.MQTTInactivityMonitor.onCommand(MQTTInactivityMonitor.java:123)
	at org.apache.activemq.transport.mqtt.MQTTTransportFilter.sendToActiveMQ(MQTTTransportFilter.java:91)
	at org.apache.activemq.transport.mqtt.MQTTProtocolConverter.onActiveMQCommand(MQTTProtocolConverter.java:505)
	at org.apache.activemq.transport.mqtt.MQTTTransportFilter.oneway(MQTTTransportFilter.java:66)
	at org.apache.activemq.transport.mqtt.MQTTInactivityMonitor.doOnewaySend(MQTTInactivityMonitor.java:146)
	at org.apache.activemq.transport.mqtt.MQTTInactivityMonitor.oneway(MQTTInactivityMonitor.java:135)
	at org.apache.activemq.transport.MutexTransport.oneway(MutexTransport.java:68)
	at org.apache.activemq.broker.TransportConnection.dispatch(TransportConnection.java:1415)
	at org.apache.activemq.broker.TransportConnection.processDispatch(TransportConnection.java:934)
	at org.apache.activemq.broker.TransportConnection.iterate(TransportConnection.java:980)
	at org.apache.activemq.thread.PooledTaskRunner.runTask(PooledTaskRunner.java:133)
	at org.apache.activemq.thread.PooledTaskRunner$1.run(PooledTaskRunner.java:48)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:744)