How to send joystick data over TCP connection
Hi all,
I am a long time Labview discussion forum user for learning, but this is my first time posting a question, I hope somebody can help me!
In the attached VI I am trying to send data from a joystick over a TCP connection. I can send data fine using the TCP examples (in fact the majority of my VI is just a copy of the example). However I am to the point where I do not know how to send all the data necessary (3 axis data, 12 buttons, and the POV data) over TCP. Strings, clusters, and arrays were never my strong suite and converting between them is a nightmare for me.
Basically I am trying to send each axis data (X,Y, and Z), button data (12 buttons), and POV data (the POV data will be calculated to adjust the position of a camera, so the immediate data is not important, I will add functions to add the change in the button movements to write a standing position for two servos [pan and tilt], for which that I will need to send over the TCP connection) over the TCP connection to control various cameras and motors. I don't know if it is posible to send that much data over a TCP connection in one write VI through a string, and also how to separate the string on the other side in order to control the client VI.
Again, the actual TCP communication I get, and can operate fine, just formatting all the data into a string (or whatever is required) so that I can unpack on the other side is the issue here.
Another question I have (not impotant to get the program running just might make it easier on me) is can a TCP server (which sends the data to the client) also recieve data back from the client on the same port ( for example sensor data and digital positions [on,off])? Or do I need to set up two TCP communication loops with the first client acting as the server on a different port than the first, which then sends the data to the original server, which also has a client TCP configuration in another loop? I hope this makes sense...
One final question.....I already have a solution to this but using labview for the entirety of this project would be nice. I use skype to stream 1080p video from a webcam to my computer so I can view live feed. Can labview do this? This would be awesome if so, I am just not sure if the communication protocols in use could support real time (or as close as possible to streaming) for 1080p video.
Thanks all in advance for your help,
Physicsnole
Attachments:
cameraserver.vi 24 KB
cameraclient.vi 18 KB
Physicsnole wrote:
In the attached VI I am trying to send data from a joystick over a TCP connection. I can send data fine using the TCP examples (in fact the majority of my VI is just a copy of the example). However I am to the point where I do not know how to send all the data necessary (3 axis data, 12 buttons, and the POV data) over TCP. Strings, clusters, and arrays were never my strong suite and converting between them is a nightmare for me.
Well, you cast the axis info cluster to a string, but then you cast it back to an array of DBL. Thatr's not compatible. You should probably cast it back to an "axis info" cluster of exactly the same type. Go the the other VI and right-click the cluster wire to create a constant. Now move that diagram cluster constant to the other VI and use it as type.
Your default ports don't seem to match. You seem to have client and server roles confused. In the sever you create a listener, but then you start sending packets, even though no connection is established. The connection needs to be initiated by the client.
Your client stops the loop the first time a timeout is encountered. Shouldn't that be more permanent? Also, please retain code clarity and avoid unecessary complexities. For example, replace the "not or" with a plain "or" and change the loop to "stop if true"
Physicsnole wrote:
Basically I am trying to send each axis data (X,Y, and Z), button data (12 buttons), and POV data (the POV data will be calculated to adjust the position of a camera, so the immediate data is not important, I will add functions to add the change in the button movements to write a standing position for two servos [pan and tilt], for which that I will need to send over the TCP connection) over the TCP connection to control various cameras and motors. I don't know if it is posible to send that much data over a TCP connection in one write VI through a string, and also how to separate the string on the other side in order to control the client VI.
You can send as much as you want. The casting to/from string is the same as described above.
Physicsnole wrote:
Another question I have (not impotant to get the program running just might make it easier on me) is can a TCP server (which sends the data to the client) also recieve data back from the client on the same port ( for example sensor data and digital positions [on,off])? Or do I need to set up two TCP communication loops with the first client acting as the server on a different port than the first, which then sends the data to the original server, which also has a client TCP configuration in another loop? I hope this makes sense..
The primary function of a "server" is to wait for a connection and then communicate with the client once a conenction is established. An established TCP/IP connection is fully two-way and both sides can send and receive.
LabVIEW Champion . Do more with less code and in less time .
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How to send class data over TCP/IP like a serialized cluster
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=====================
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Is there any method to send string data over socket.
and if client send string data to server,
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Comments please!Thank for your kind answer, stoopidboi.
I solved the ploblem. ^^;
I open the source code ^^; wow~~~~~!
It will useful to many people. I spend almost 3 days to solve this problem.
The program works like this.
Client side // string data ------------------------> Server side // saving file
To
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* Auther : [email protected]
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as Title~
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How to read data over tcp/ip using labview
Hi,
I have a network enabled force transducer (6-axis load cell). I know its IP addr. and the data format it is sending the data out (7 32-bit DWORD, One status and 6 axis force data) . I have been playing around with the simple data client.vi example program.
When I executed the program using the devices IP addr. I used to get error 63: TCP/IP connection open. Then I ran the program using localhost in IP addr field, the program executes now indefinetly at one block only. I am attaching the screenshot for ref.
Thanks.
Sasi.
Attachments:
TCP-IP.JPG 62 KBHello,
I'm wondering if you can create a rather simple VI that just tries to open and close a TCP connecting to your transducer. All you would need is a TCP Open and a TCP Close wired together with the proper IP address etc. Does this run? I did look to see if there was any NetFT information and I could not find anything. I feel that the problem lies in the communication protocol between your transducer. Another place to see if you can connect to it would be to try hyperterminal. You can access this in Windows XP by clicking Start»All Programs»Accessories»Communications»HypeTermina. Using this, you can try and connect to your instrument with TCP/IP outside of LabVIEW. You might also want to get in contact with the manufacturer to verify that third-party software can indeed communicate with it. There may be a specific set of instructions that need to be sent to the transducer in order to initiate the connection and then read from it. These may be in the form of serial commands that would need to be sent over TCP. What is the make and model of your transducer?
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Certified LabVIEW Developer -
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
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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 KBYou 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.
LabVIEW Champion . Do more with less code and in less time .
Attachments:
UDP_READ_1MOD.vi 29 KB
UDP_SEND_1MOD.vi 27 KB -
Receive data through TCP connection
Hi
I'm receiving a string "Hello" from TCP from a C-program, where I have to display this string in a string indicator in LabVIEW.
I have the following block diagram I found among the examples:
The point here is that I can only read the last character "o" in the indicator when I change the "bytes to read" value to 4 bytes, but can read the characters "ello" when setting the bytes to read value to 1. How do I read the whole "Hello" string ?.
Best regards
Oesen
Attachments:
Simple TCP - Client.vi 15 KBSince you are sending a string, I would try using "CLRN" mode on TCP Read. Then you can trigger it to read all the text until the "/r/n" characters in C.
mode indicates the behavior of the read operation.
0
Standard (default)—Waits until all bytes you specify in bytes to read arrive or until timeout ms runs out. Returns the number of bytes read so far. If fewer bytes than the number of bytes you requested arrive, returns the partial number of bytes and reports a timeout error.
1
Buffered—Waits until all bytes you specify in bytes to read arrive or until timeout ms runs out. If fewer bytes than the number you requested arrive, returns no bytes and reports a timeout error.
2
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3
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Otherwise, you need to follow the instructions per protocol;
bytes to readis the number of bytes to read. Use one of the following techniques to handle messages that might vary in size:
Send messages that are preceded by a fixed size header that describes the message. For example, it might contain a command integer that identifies what kind of message follows and a length integer that identifies how much more data is in the message. Both the server and client receive messages by issuing a read function of eight bytes (assuming each is a four byte integer), converting them into the two integers, and using the length integer to determine the number of bytes to pass to a second read function for the remainder of the message. Once this second read is complete, each side loops back to the read function of the eight byte header. This technique is the most flexible, but it requires two reads to receive each message. In practice, the second read usually completes immediately if the message is written with a single write function.
Make each message a fixed size. When the content of a message is smaller than the fixed size you specify, pad the message to the fixed size. This technique is marginally more efficient because only a single read is required to receive a message at the expense of sending unnecessary data sometimes.
Send messages that are strictly ASCII in content, where each message is terminated by a carriage return and linefeed pair of characters. The read function has a mode input that, when passed CRLF, causes it to read until seeing a carriage return and linefeed sequence. This technique becomes more complicated when message data can possibly contain CRLF sequences, but it is quite common among many internet protocols, including POP3, FTP, and HTTP.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
If someone helped you out, please select their post as the solution and/or give them Kudos! -
Sending binary data over RS232 without conversion to ascii
I need to send binary data to a PIC without the data being converted to ascii. With the VISA vi's, when I want to send 11111111, it gets converted to a string "255", and is sent as "2","5","5" in ascii.
How can I send it as one byte?r_keller wrote:
@tbob: I probably shouldnt tell my customer that he's an idiot, and obviously 9 bit addressing/signalling modes seem to be not so uncommon in industry, so ur post does not really contribute to solve the problem.
Well I wouldn't call my customer an idiot either. I didn't know he was your customer. Sorry. Not every comment posted here is intended to directly solve a problem. We are a fun loving group, and occasional ribbings take place here. I still think that trying to use 9 bits over an 8-bit protocol is not a good way to go. But if it is the only way, then so be it.
r_keller wrote:
Does the Mark or Space parity bit add another 10th bit to the command or can i only use either ODD parity/Mark/Space?
According to the link you attached, the parity bit adds only one more bit. If the number of bits is set to 8, then the parity is the 9th bit, and you can only use Mark or Space to force that 9th bit to either 1 or 0 respectively. If you try to use odd or even parity, the protocol will determine the parity and change the bit accordingly, and it may not be the one you intended to send. The start and stop bits are fixed by the protocol and cannot be used for extra data bits.
Actually, until I read that article about using Mark and Space, I had no idea at all that sending 9 bits at a time was possible.
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Send multiple strings over TCP - Like messenger service
Hello all Java Coders,
I'm new with TCP programming.
I'm beggining to learn about TCP and sockets connections in Java. In order to achieve this, I was coding a mini-program so I can learn a little bit about this.
I'm trying to make a simple TCP program.
The server sends a string to a client...
I already searched for a couple of hours in google and so on, about what I'm doing wrong.
[The server code (Just click)|http://pastebin.com/m39fd1273]
[The client code (Just click)|http://pastebin.com/m57471803]
I hope that someone can help me with this and, if you have patience, please tell me the reasons my code doesn't work.
Many thanks,
Freiheitpt
P.S.: I think that the problem is on the server side...Sorry jverd.
I was just trying to put things organized.
Well, I can't get the String to be sent to the client.
No error occurs.
Server:
try {
srvr = new ServerSocket(1234);
System.out.println("Connecting...");
skt = srvr.accept();
System.out.println("Connected!\nPreparing data exchange...");
stream = skt.getOutputStream();
out = new PrintWriter(stream, true);
System.out.println("Done!\nReady to Send!");
} catch (IOException ex) {
System.out.println("Ups, didn't work!");
System.exit(1);
while(!data.equalsIgnoreCase("end")) {
System.out.print("String to send: ");
data = input.nextLine();
System.out.print("Sending string: '" + data + "'\n");
out.print(data);
}Client:
try {
skt = new Socket("localhost", 1234);
System.out.println("Connecting...");
if (skt.isConnected()) {
System.out.println("Connected!\nPreparing data exchange...");
stream = skt.getInputStream();
inputStream = new InputStreamReader(stream);
in = new BufferedReader(inputStream);
System.out.println("Done!\nReady to Receive!");
} else {
System.out.println("Server not available!\nExiting...");
skt.close();
System.exit(1);
} catch (IOException ex) {
System.out.println("Ups, didn't work!");
System.exit(1);
while (!data.equalsIgnoreCase("end")) {
while(!in.ready()) {}
data = in.readLine();
System.out.println("Received String: '" + data + "'");
}
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