TCP Listen.vi delay application

Similar Questions

• Nagle algorithm affecting TCP listening

  I have two LabVIEW applications communicate with each other over TCP for a monitor streams data to a receiver. Ideally, I'd like my monitor, that generates the data, to listen to a TCP connection and then send data via this connection when my receiver connects to it. When I structure my code in this manner, I find that I get peak latencies of ~ 500ms (!).

  I came across the following knowledge base article functions use LabVIEW TCP Nagle Algorith? and initially found no speed upward.

  When I reorganized my code so that the receiver has acted as a listener and my monitor connected to the port of receivers and IP, then the TCP function without delay worked as announced.

  There experience with disabling the Nagle algorithm on a listening port, for example like this?

  

  I wish that my application of monitoring to act as a passive monitor other applications that can connect to.

  I found the question once I started to do a test project to illustrate the problem.

  My receiver application was configured as a state machine waiting in line and there was a bug where read occaisionally would not wait it on the TCP protocol. It resembled a bottleneck on the side sending. When I changed between the two implementations I removed the bug without knowing what actually look as if the issue was with how I disable the Nagle algorithm.

  Everything seems to work fine now!

• The TCP Listen.vi doesn't seem to detect reliably all the elements on the network.

  I use a network dedicated to four devices. When I run the TCP Listen.vi it does not always detect all four of the devices. Sometimes, he gets all of them and in the worst case, a single device.  The question I have is to detect if it's the vi or if there is that something screwed up with the network, or with devices.  I bet on the devices, but the development engineers always tell me it perfect stuff. From time to time, I have a hard time to believe for some reason any.

  Someone has ideas how to analyze where is the problem?  I am a newbie with TCP stupid mistakes are not only possible, but likely.

  Thank you

  Dave

  Nathand,

  I think you have already revealed the possible source of the problem. I think that I do not use this thing correctly based on your information.  I'll go back and rewrite things and see where I get.  And thanks for the tip of Wireshark. Never heard before.

  Thank you!

• TCP listen accepts only 1 packet

  Hello

  I am creating a TCP/IP VI converter RS232. I am using this VI to allow my main VI communicate over a network with a microcontroller (via rs232) and I do not have access to a hardware renderer.  The VI works fine to send data of microcontroller (RS - 232--> TCP) but I'm having problems to get the information to the microcontroller (TCP--> rs232). I tried many configurations of server using the TCP listening and decision-making create. For some reason that I can't only to receive a package when you use TCP listen and not everything in a loop, but it only gets 1 sachet and none after that. I used other programs to make sure that the main VI properly sends the packet to that port and have verified that the problem is now VI.

  The following image is the version of 'work' which receives only the first packet sent to this

  

  The following two photos are the other configurations, I tried, but they receive no package.

  TCP listen with while loop

  

  TCP waiting on the listening port

  

  If you can provide any help it will be much appreciated.

  Thank you

  meanmon13

  Those who will not work because you are not thinking dataflow. Data flow means that each piece will run when all entries that are available. Your first while loop runs forever. There is an entry for the second loop from the first loop. Therefore, it will never get to your second loop while, and that's why you get nothing.

  Put everything in a loop and son of error help control order

• NEITHER cRIO 9068 TCP listener

  I'm trying to get a listening TCP port to work on the cRIO NI 9068 chassie and have had problems with my VI does not after it receives a TCP connection.

  I went to the example project named Service LabVIEW TCP and added my 9068 cRIO chassie and moved the named Service TCP - server vi and experianced the same non responcive behavior when the Client connects to it. I've added my cRIO chassie 9082 and moved the VI server to him and it worked without problems. Note You must change the address in the block diagram of the client to match the IP address of the cRIO.

  I'm using LabVIEW 2013 SP1

  I was wondering if anyone else has seen this before and had clues about how to solve this problem.

  Thank you
  Jeremy Crismore

  
  

• Another application is already listening to the application ID - PushWoosh

  I'm developing an application of crossed with phonegap and Jquery mobile platform. I'm trying to implement push notifications for the blackberry application using PushWoosh.

  After installing the application, I am able to successfully save and receive Push Notifications. But, when I close the application and open it again, I get an error that says "another application already listening for Application 27 ID."

  Where should I put the register in my code method such that it gets only run at startup / first installation?

  All the world is facing this problem? If so could you please explain how to solve this problem.

  I'm new to the WebWorks development and can use all the help...

  Thank you 1 million.

  Info:

  PhoneGap 2.8.0

  jQuery 1.9.1

  jQuery 1.3.1 Mobile

  SDK WebWorks

  PushWoosh

  HTML5 is an API that allows you to systematically store data on the local storage device. After have registered you once save an indicator of storage that you can check. The solution is not specific to WebWorks, just use the HTML5 standard API.

• NET TCP LISTENER ACTIVATOR

  Anyone know how reactive adapter NET TCP in WINDOWS SERVER 2008 R2. the service is not running I try, but an error apears ERROR: 1075 DEPENDENSY SERVICE DO NOT EXIST or has BEEN to REMOVE MAERKET

  Hello

  Post your question in the TechNet Server Forums, as your question kindly is beyond the scope of these Forums.

  http://social.technet.Microsoft.com/forums/WindowsServer/en-us/home?category=WindowsServer

  TechNet forums:

  https://social.technet.Microsoft.com/forums/en-us/home

  MSDN forums:

  https://social.msdn.Microsoft.com/forums/en-us/home

  See you soon.

• Problem with Listen.vi Linux TCP

  I have a Linux machine that is configured with two IPS (192.168.0.X), with a physical ethernet taken.  When you run a program on it (using Listen.vi TCP) to connect ethernet to a remote computer, it works fine.  If the program is re-entrant, and I have two of the programs running simultaneously, each with unique IP address and a port number, it still works very well.  If I use the same IP address for both of them, but the unique port numbers, it still works very well.  However, if I use unique IP addresses but the same port number for each of them, I get error 60 (connection already in use).

  For example,.

  192.168.0.11:6000 and 192.168.0.12:6001--> OK

  192.168.0.11:6000 and 192.168.0.11:6001--> OK

  192.168.0.11:6000 and 192.168.0.12:6000--> error 60

  I tried the wiring to the specific IP address in the TCP Listen.vi, nothing helped.

  Any ideas on why this could be implemented?

  Thank you in advance.

  A fix for the problem, after discussing this with an engineer NOR is attached.

• Stop listening tcp and tcp read

  Hi all

  If I use tcp and tcp listening read blocks with a time of judgment-1, how to prevent their execution if they are waiting for incoming connection or data?

  The read block tcp is in a while loop and the State of the stop button is not evaluated, because the reading block is pending.

  can someone tell me a solution compatible with the S-RIO target device problem?

  Thank you

  Hi giac82,

  I know you want to just close the server. You can create your own connection to the listener. You need another loop for it.

  See the attached picture. This is only a small example. You can do more complex to react on the different statuses.

  Mike

• How to create the TCP non-blocking server?

  Hello

  I would like to have a TCP server at my request.  It will go about their business as usual, but in the background a TCP server sits waiting for a client connection.  If such a link exists, the normal code will send stuff on this topic otherwise it will just not send.  Currently, I do not see how to stop this blocking while it waits for a client (block waiting on TCP listener).  I looked at the example of client/server TCP, but it remains blocked in the same way.

  I would like advice on how I'm framing such a request.  I also want to do the same on the client side.  Go about business as usual and if a connection can be established at a time given, then send stuff on that connection otherwise just not worth it.

  Concerning

  Ashley

  LabVIEW parallel code usually runs in parallel. This is true even a wait - if inside a loop, you wait 100ms and other code in parallel, it is not delay execution of other code, rather he runs forward and the other code at the same time. When both have completed, the loop can proceed to the next iteration. So yes, if you have a loop with a 1000ms wait and another with an expectation of 100 ms and waits take longer to execute any parallel code in loops, then the loop of 100ms will last about 10 times as many times as the loop with the 1000ms wait.

  I recommend that you put the waiting on the listener in a separate loop and also have another parallel loop that manages the communication when the connection is established. You can then use a timeout (forever) of-1 on waiting on the listener, and this loop will be almost never run or use resources except what is first of all establish a connection. To kill this loop, close the listener somewhere which depends on waiting on execution of the listener. When a new connection is established, put the link in a queue, where the communications loop can pick it up.

• Methods to transfer data of Service Web Application LV?

  What methods do people have found it more useful to transfer data Services Web of LabVIEW and their instance of the main application? I have a project using LV RT and I would like to be able to send data to the target RT via HTTP requests.

  I found surprisingly little information on the different available methods / best practices for this and there aren't something I tried to do before - I use mostly of Web Services for hosting of static content that uses my library WebSockets.

  These are the methods that I know:

  -Static Variables: the only information of OR , I could find on the way to proceed was to create two shared variables, one for the RT, one for the Web Service and alias them. It seems ridiculous and is useful for data "tag.

  - File: write data to a file within the web service and read out in the application. Therefore, the file/folder for querying data.

  - TCP/UDP: write a Manager TCP/UDP in the application that listens to incoming connections, then create the connection and send the data inside the web service VI.

  - Server of VI: I saw a presentation here that speaks using Server VI (slide 8), but when I tried to get a queue named within the VI (using the instance of the application open / open reference vi at the request on port 4000), I get error 1100 (no queue found with the same name) of the published web service It does not seem to complain about not being able to connect to the instance of the application. Executes the VI locally or from the debug server works. See the attached project (LV2013) for what I tried.

  So, the question is - why my VI Server method does not work when it should (according to this presentation, I couldn't find the examples mentioned) and what methods people have used and had success with? I was hoping that the last method would be to succeed because it means I can push data directly into an existing queue manager, would be a fairly light and medium solution, I wouldn't need to write a custom file manager / network.

  OK - after playing more - I had no wired 'localhost' to the instance of the application open VI I thought I passed by default to "localhost" rather than "this instance of the application. Then I got the "VI Server Access is denied" and added * to the exported VIs list and it worked.

  Always curious to hear other methods / thoughts / success though.

• Get TCP Service Port number name

  The TCP listen and the TCP create listener screws have an entry named 'Service name' base, once a listener is created in the LabVIEW application is it possible what service named is running on which port in an external application and query? The external application may or may not be developed in LabVIEW.

  TCP exits create listener VI the port number used, this is useful information, but I don't see any automatic method for an external application to get this information?

  C++ getservbyname function does not return the information given to the listener of LabVIEW TCP known, created and listen.

  The help of LabVIEW:

  name of the service creates a reference known for the port number. If you specify a service name, LabVIEW saves the service name and the port number with the of Service Locator OR.

   

   

  OR Service Locator:

  http://digital.NI.com/public.nsf/allkb/227453F884CE035386256E55007A303D

• Need help on TCP/IP port multi Client-Server

  Hi all, I'm trying to develop a client-server application to disseminate data on a few numbers of random ports (defined by myself) to the data on the server TCP stream (IE another computer) in LabVIEW. So far, I created my app using the examples OR for 'Simple Client + Server data' and it works fine. I also understand that VI 'TCP Listen' could not listen to the TCP 1 connection only and a way around this is to use the idea of queues to receive & process the incoming data. The disadvantage of the idea is that the 'port' basic (IE original port) must be the same (on each client TCP) with the TCP server and it is not suitable for the use I have planned.

  Basically on the side of TCP server, I need to graph/control data on different port numbers that are currently broadcast in real time to client TCP one computer. Is this possible in LabVIEW?

  Anyone (gurus OR incl.) advise and point me in the right direction?

  * lost *.

  Hello

  http://zone.NI.com/DevZone/CDA/EPD/p/ID/2739 Here you can download this component. But you can also use the TCP icons which is available in the data communications > Protocals > TCp for communication and to read and write data using flattened string Variant. I have attached a small example where I'll copy a constant string to the PC to check the connection between the client and the host server. Hope this helps you.

• name of the listener

  Hello

  on 11.2.0.3

  I want to set this parameter:

  SECURE_REGISTER_LISTENER_name = (CPI)

  My partner has no name. Here's my listener.ora file:

  = Listener.ora =.

  LISTENER =

  (DESCRIPTION_LIST =

  (DESCRIPTION =

  (ADDRESS = (PROTOCOL = CIP)(KEY = EXTPROC1521))

  (ADDRESS = (PROTOCOL = TCP) (HOST = WIN-1TVCB2GR06S)(PORT = 1521))

  )

  )

  =================End of file=====================

  How should you define the parameter?

  SECURE_REGISTER_LISTENER_? = (CPI)

  Thank you.

  HDeiby wrote:

  Then the name is LISTENER (this is the default).

  SECURE_REGISTER_LISTENER_LISTENER = (CPI)

  You'd better check the syntax... see Oracle Net Listener (listener.ora) parameters

  In the syntax, the word "auditor" is no NOT part of the name of the parameter.

  SECURE_REGISTER_listener_name

  Goal

  To specify the transport on which registration requests are allowed.

  Syntax

  SECURE_REGISTER_listener_name = [(]transport1[,transport2, ....,transportn)]
  

  In the previous example, transport1 , transport2 , and transport n are the names of valid transport protocol installed.

  Configuration

  If the SECURE_REGISTER_ listener_name is configured with the list of names of transport, while connections coming into the specified transport will be able to register the service with the listener. The connections coming out of other transport protocols are refused. For example:

  SECURE_REGISTER_listener1 = (TCPS, IPC)
  

  In the previous example, applications are accepted only on the TCPS and CPI, transport.

  If no value is entered for this parameter, then the listener will accept applications for registration of any transport.

  If this parameter and SECURE_CONTROL_listener_name are configured, and then they replace the SECURE_PROTOCOL_listener_name parameter.

  Example of

   LISTENER1= (DESCRIPTION= (ADDRESS=(PROTOCOL=tcp)(HOST=sales-server)(PORT=1521)) (ADDRESS=(PROTOCOL=ipc)(KEY=extproc)) (ADDRESS=(PROTOCOL=tcps)(HOST=sales-server)(PORT=1522))   ) SECURE_REGISTER_LISTENER1=tcps
  

• LabView TCP read

  Hello

  I'm reading the data from a personal weather station which is transmittng data to a web site using a bridge.  I can see the data transmitted with WireShark, so I know the bridge works and the data is there.  Also the data are learning web site.

  I want to read that data, using LabView, it is sent to the web site.

  I tried the TCP connection open with the TCP Read function and also the TCP Listen.vi with the TCP Read function without success.

  I have attaced the two screws and also a page of WireShark.

  A question I have is how do I know what port to monitor?  It continues to change in WireShark?

  Any help is appreciated.

  Perry

  TCP in LV functions are not sniff the functions. They are used for the direct connection from point to point.

  If the web site supports getting data back, you can try to contact and to read the data in (probably use the HTTP or web service screws, according to the API provides the site).

  Otherwise, you could try to imitate the BT site and having the unit send you data, but probably the address of the site is hard coded into the device. You could probably play with it to feign a DNS server which will redirect to your computer, but you should always know what the API to send data on the site.

  A third option is to do the desired sniffing. LV has no functions for this, but you can find wrappers that people wrote for WinPCap, that might do what you want. I've never used, so I don't know.