MATLAB: Telnet into locked device through Ethernet

telnet

Hello,

I'm not good with networking so I may misuse some terms. I have a password-protected linux device I need to control via telnet through Matlab. Using 'dos' or 'system' don't allow me to input the username and password. The instrument control box cannot establish a connection as a TCP/IP instrument ('No instrument was detected'). Is there a good walkthrough or set of functions I should be seeing? Spend some time googling and couldn't come up with anything that helped.

Thanks!

Best Answer

As you have the Instrument Control toolbox, you can use tcp(). telnet is TCP port 23.

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MATLAB: How to receive UDP broadcast data in MATLAB using Instrument Control Toolbox

You can receive UDP broadcast data using the UDP functionality in Instrument Control Toolbox.

If you are only receiving UDP packets, and not sending out any UDP packets, the only relevant properties of the UDP object are LocalHost and LocalPort; the RemoteHost and RemotePort are not relevant in this case.

LocalHost is the host name or IP address of the Ethernet adapter you are receiving the UDP packets on, and the LocalPort is the port number you are receiving the UDP packets on.

Note: If you don't specify LocalHost (or if you set it to an empty string), you will receive UDP packets on all available Ethernet interfaces at the specified LocalPort.

% Listen on all available Ethernet interfaces at local port 8000.
% Specify a LocalHost (host name or IP address) if known
u = udp('', 'LocalHost', '', 'LocalPort', 8000);
fopen(u);
% Receive a single UDP packet
packetData = fread(u);
% Clean up
fclose(u);
delete(u);
clear u

MATLAB: MATLAB to TELNET

<http://code.google.com/p/ni-gpib-matlab-wrappers/downloads/detail?name=ni-gpib-matlab-wrappers%20v0.5.zip&can=2&q=>

t = tcpip('123.456.789.123', 8080);
t.write('STOP')
t.close();

Hope this helps. By the way if you want to get a response use:

response = t.read();

(thanks Brent!)

Best Answer

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MATLAB: How to receive UDP broadcast data in MATLAB using Instrument Control Toolbox

MATLAB: MATLAB to TELNET

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