I'm using a 1D Arrary with 27 different elements and would like to send those data over UDP Write and UDP Read functions.

Question

I'm using a 1D array with 27 different elements. I would like to transfer that data over a UDP connection, and read it back by using UDP connections.
But I would like to read 3 elements at a time (On read side) and send those to 9 different ports.
Note: the data will go to only one PC with one Network Address)
* 1st elements (0,1,2) and send to port #XXX to see those 1st 3 elements.
* continue until the elements reaches up to 27
This is what I have done but I'm finding myself in pitfalls...
Send side:
I'm using a UDP Open connection on send side to send my data. So with selected a Source Port, I have created a UDP Op
en connection. I�m using only one source port to send all the data across the channel. I would like to read 1st 3 elements and send those data across with an assigned Destination port. I would like to do that for 9 times b/c there are 27 elements in the array. So I�m using a For Loop and setting N count to 9. So I�m not getting any errors when I execute and no answer on the other side at all.
Read side:
I�m using a UDP Open connection to read in the data with port #. I�m using while loop to with Boolean inside by making a true all the time. Inside that While loop, I�m using For Loop to read the 3 elements data a time and send to a right port address. (As start out I was just trying to see if it works for only one port).
Attachments:
UDP_SEND_1.vi ‏40 KB
UDP_READ_1.vi ‏31 KB

Answer 1

You are not getting any errors because UDP is a connectionless protocol. It does not care if anyone receives it. Your example will work fine with the following considerations.
(1) Don't use the generic broadcast address (255.255.255.255).
(2) You are listening on port 30000. So why are you sending to port 1502, nobody will receive anything there.
The destination port of the outgoing connection must match the server port of the listener. (The source port is irrelevant, set ot to zero and the system will use a free ephemeral port).
(3) On the receiving side, you are not indexing on the received string, thus you only retain the last received element. Then you place the indicator outside the while loop where it never gets updated. :-(
(4) Do yourself a favor and don't micromanage how the data is sent across. Just take the entire array, flatten it to string, send it across, receive it, unflatten back to array, and get on with the task.
(You can do the same with any kind of data).
I have modified your VI with some reasonable default values (destination IP = 127.0.0.1 (localhost)), thus you can run both on the same PC for testing "as is". Just run the "read" first, then every time you run "send", new data will be received.
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Attachments:
UDP_READ_1MOD.vi ‏29 KB
UDP_SEND_1MOD.vi ‏27 KB