Error when trying to open a new connection with tcpip

Question

Eleanor Cole 2015-7-16

评论： Vinod 2017-5-25

Hello everyone, I am trying to open a new connection in MATLAB using the tcpip command:

connection = tcpip('localhost', 5666);

However, I keep getting this error message: ??? Undefined function or method 'echotcpip' for input arguments of type 'char'.

I am not sure where to go from here. If you could give me any advice that would be great. Thanks, Ellie (useless at MATLAB)

Nitin Rawat 2017-5-24

Geoff Haynes - I'm facing the same problem and while using the command " which -all echotcpip", i got this error "'echotcpip' not found."

Vinod 2017-5-25

'echotcpip' is part of Instrument Control Toolbox. execute the 'ver' command to find out what Toolboxes you have installed and have a license for.

Answer 1

Rahul Goel 2015-7-20

Hi Eleanor,

I understand that you are getting an error while opening a new connection using ‘tcpip’.

In addition to Geoff’s suggestion, you can also try turning the tcp echo server “on” before creating a connection object. This can be done as:

>> echotcpip('on', 56666)

where “56666” is the port number you want the tcp echo server to run on. Then an object to the connection can be created:

>> conn = tcpip('localhost', 56666)

provided that the function “echotcpip” is not shadowed in the MATLAB path as suggested by Geoff.

Hope this helps.