LabVIEW
I'm using a 1D Arrary with 27 different elements and would like to send those data over UDP Write and UDP Read functions.
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.
(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.
For "type", you need to wire the same data type that you used for "flatten to string", in this case an array of strings. If you had flattened a string of DBL numbers, you would wire an empty DBL array, etc. Since flatten turns everything into a string, you need to tell LabVIEW what kind of data it was so it can be converted back to the correct data type.
Some possibilities are shown in the attached image that I posted a while ago in a different context. Let me know of this helps.
Some possibilities are shown in the attached image that I posted a while ago in a different context. Let me know of this helps.
Sorry, your description is not clear to me. Could you clarify a little bit what you want to do?
What is the meaning of "each time"? Do you want to extract only 3 elements out of the 27? Do you want to display 3 at a time, first #0-2, then #3-5, and so on? What determines the timing between updates in this case? Should the new triplet overwrite the previously displayed three elements? Do you want to generate a 2D array (size 3x9)? Something else?
Thanks.
What is the meaning of "each time"? Do you want to extract only 3 elements out of the 27? Do you want to display 3 at a time, first #0-2, then #3-5, and so on? What determines the timing between updates in this case? Should the new triplet overwrite the previously displayed three elements? Do you want to generate a 2D array (size 3x9)? Something else?
Thanks.
Here is an example to get three elements at a time from a 27 element array. You simply reshape it into a 3x9 array and use autoindexing to get a slice with three at each loop iteration.
