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delay tcp open connection on RT target
ynse
Member
11-06-2008 08:08 AM
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Hi everyone,
Im having a problem with opening an tcp/ip connection to a RT pc. The setup I'm using consists of a windows pc (client) and a RT desktop pc (server) running ETS. At the client side I open a tcp connection, and the RT side listens for an incoming connection.
At first, my windows and RT pc were a part of the LAN at my work and everything worked fine. Now i took both pc's out of the LAN and connected them directly together with a cross over cable. I also gave both pc's a fixed ip address and the same subnet address. This worked fine up until a week ago. Now if i try to open a tcp connection, the RT pc gives the following message: "Waiting for real time target to respond, Stop waiting and disconnect". In case you ignore the message, about 20 seconds later a connection established. Once the connection is made, the rest of the communication seems to be working fine.
I cant figure out why it takes so long to setup that connection, i also noticed that my Labview program on the RT pc freezes those 20 seconds or 19.
Other post's regarding more or less this issue, suggested that it had something to do with the DNS server, but when i directly connect 2 pc's together, then the DNS server is out of the picture?
Greetz,
Ynse
MikeS81
Proven Zealot
11-07-2008 07:43 AM
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Hi Ynse,
i think the message "Waiting ..." is normal, if you start your rt vi from the inside the project. Did you change something on your pc, what can cause these delay?
Mike
11-13-2008 04:08 AM
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Hi everyone,
The problem is solved (for now it seems to be working). On the server side i used the "TCP listen.vi" that is used in the LabVIEW examples, but this vi does a little more then just listen for an incoming connection, it also has an "internecine avoider vi". So i replaced the "TCP listen.vi" by an "create listener" and "wait for listener" block, after that the target didn't complain anymore about not responding. Maybe the "TCP listen.vi" has trouble with real time behaviour or the other way around? But anyways i can continue with my application now 🙂
Greetz, Ynse.
