How do I close the udpport with 2021b? Error Unable to bind to LOCALHOST and LOCALPORT. Verify that the LOCALPORT is not in use...

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Brandon Krick 2021-11-30

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评论： Rakesh 2023-3-31

I am switching my app to use the new udpport. It works the first time I use it. However, when I close the app, then run it again and attempt to connect, it seems that the resource is still in use:

Error: "Unable to bind to LOCALHOST and LOCALPORT. Verify that the LOCALPORT is not in use, and that LOCALHOST and LOCALPORT are valid for IPADDRESSVERSION "IPV4"."

I used to just use delete(isntrfind) or instrreset, but those don't seem to work. Now, if I start a udpport, then close the app, I get the error above. I have to close matlab to get it to forget the udp port.

Thanks!

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Rakesh 2023-3-31

Hi Brandon.

Add close button in first app where you can add clear udpport in the "ButtonPushedFcn" of close button.

In the second app in the startup function you can reconfigure the udpport .

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Dor Luzon 2022-5-30

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Hey,

The only thing that actually close the conneciton for me is using the udpport function delete.

udpPort.delete();

flushing and clearing the object doesn't work.

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Walter Roberson 2021-11-30

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in theory it needs to have the variable holding the port cleared. I suggest that you put in an onCleanup to ensure that it is done.

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Walter Roberson 2021-11-30

I don't think you can clear a struct member; I think you would need to assign something else such as [] over top of app.ZMotor.portName

Brandon Krick 2021-11-30

Thanks. That worked. Silly structure syntax...

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Test and Measurement Instrument Control Toolbox Interface-Based Instrument Communication UDP Interface

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R2021b

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