Basic dsp UDP question

Hello,

I am new to networking. I want to communicate between 2 computers using UDP. I've been searching through Matlab's help section and stumbled across the dsp.UDPSender/Receiver functions. I am still a bit unsure as how these work.

From my understanding, this is the basic idea of how dsp.UDP works

Sending computer:

Sender=dsp.UDPSender(‘RemoteIPAddress’,’reciever.IP.Address’);
% reciever.IP.Address is the IP of the dsp.UDPReceiver

   Var=rand(1,256);
  Step(Sender, Var)

Release(Sender)

Receiving computer

% while sender is sending info
Receiver= dsp.UDPReceiver

Var2=Step(Receiver)

Release(Receiver)

Is this set up correct? I am unsure how the step() command works. I understand it transmits data, but I don’t know when to tell the Receiver to step(). Do I run both of these at the same time? Is there a way I can make sure that data is actually being sent?

Thanks in advance,

Matt

[Walter Roberson]

Note: somewhere along the way you must also specify UDP port numbers.

I am not familiar with the dsp UDP methods.

Have you looked at the udp() of the Instrument Control Toolbox? Or alternately at the File Exchange contribution named tcpudpip() ?

[Matthew]

I don't have that tool box. I believe the port number is automatcially set to 25000 on the receiver and sender.

I need to use UDP because this will be implimented in real time systems

[Walter Roberson]

The File Exchange contribution tcpudpip handles TCP and UDP. It does, however, rely upon libraries that probably would not work on a real-time system (though there just might be a QNX port.)

[Oscar Parra]

hello, did you manage to make the real time system using udp? i'm doing a work on this but i can't connect. could you give me a hand with this, thank you in advance.

Answer 1

[Matthew]

The problem was I needed to run Matlab as an administrator. Also, the sending computer most use the recieving computer's IP and vice versa for communications to happen.

[Walter Roberson]

Thank you for the update!