TCP IP multi client connection is not working properly

My Program is a client server software communication where the server collector data from a cDaq and sends data to the client then the client sends command to the server to execute. The problem I encountered is when I sedn a command to the server, It shows that the server receives it but it doesnt execute it properly. Please take it a look, and see where I went wrong. I have been stuck on this for a while. I will add the more subvis after this post
Solved!
Go to Solution.
Attachments:
multiconnection-server-with waveformGen.vi ‏102 KB
Daqmx channels config.vi ‏36 KB
Waveform command receiver.vi ‏27 KB

It's missing Untitled Library 1.
What does "not execute properly" mean? Waht is it doing or not doing and what are you expecting it to do?
I see a problem in the TCP-IP subVI client. Why are you enqueueing an element then immediately dequeueing it? Then you proceed to to enqueue it again after the subVI ends. But you have a parallel loop where you dequeue the element. You've got a race condition. One of two things could happen.
1. The data gets enqueued and dequeued inside the subVI. When it ends, it gets enqueued again in the same queue. Then the parallel loop could dequeue it and work with it. I'm guessing if this order of execution happens, it probably behaves properly for you.
OR.
2. The data gets enqueued inside the subVI. The parallel loop with the dequeue is sitting there waiting for something, dequeues the element and works with. Then the dequeue inside the subVI sits there forever waiting for an element in the queue that will never come because now you've locked up the code. The loop can't iterate to ever get more data in the queue.
You have a lot of strange queue operations going on in that subVI and another subVI in the parallel loop. Why are you obtaining another reference to the queue, flushing it, then releasing that queue reference. I'm not even going to try to guess how that would complicate the 2 scenarios I already listed above.
I suggest looking at more queue examples to understand how they work. Any given queue should only have 1 dequeue operation, otherwise the dequeues will race to steal the data from each other.

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see attached
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