I'm hoping the lack of response so far means that perhaps you've taken an interest in my reported difficulties and might also be encountering some of them?
In the meantime, would some knowledgeable person be able to indicate the flowgraph *should* work?
That is, for every "^@^@^A^QTest" (4 byte default header plus 4 byte payload) input to the transmitter, the output from the receiver should be "Test"?