AMQP test client delivery/redelivery anomoly

Using Apache Qpid test clients qpid-send and qpid-receive ActiveMQ broker behaves differently from qpidd and I'm wondering if the difference is important.

The test code command lines are:

qpid-send -a "chuck; {create:always}" --connection-options {protocol:amqp1.0} --sequence yes --content-string 0
qpid-receive -a chuck -m 1 --connection-options "{protocol:amqp1.0}" --print-headers yes

When I run the tests against qpidd they send one message and receive one message every time. However against ActiveMQ 5.11 the qpid-receive does not receive the message until one of several conditions:

• the qpid-receive command also includes "--timeout 1"
• the qpid-receive command is repeated several, possibly dozens, of times.

When qpidd broker is running or when activemq is running and --timeout is specified then the qpid-receive output is:

chug@FJELD ~> qpid-receive -a chuck -m 1 --connection-options "{protocol:amqp1.0}" --print-headers yes
Properties: {sn:1, ts:1414177685195174548, x-amqp-first-acquirer:True}

0

However, activemq running the client twice without the timeout and once with the timeout looks like this:

chug@FJELD ~> qpid-receive -a chuck -m 1 --connection-options "{protocol:amqp1.0}" --print-headers yes
chug@FJELD ~> qpid-receive -a chuck -m 1 --connection-options "{protocol:amqp1.0}" --print-headers yes
chug@FJELD ~> qpid-receive -a chuck -m 1 --connection-options "{protocol:amqp1.0}" --print-headers yes --timeout 1
Redelivered: true
Properties: {sn:1, ts:1414178091185765136, x-amqp-delivery-count:1}

0

The false receive attempts make the message look like it was already delivered, hence the Redelivered: true, first-acquirer absent and the x-amqp-delivery-count setting.

Views of the protocol interactions between the brokers and clients are here:
http://people.apache.org/~chug/adverb_qpid_send_receive_1/

I ran the tests twice on ActiveMQ with the tcpnodelay option turned on and off but that didn't seem to make any difference.