How can I receive UDP multicast data in MATLAB using Instrument Control Toolbox?

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Ken Poon 2019-2-23

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https://ww2.mathworks.cn/matlabcentral/answers/446531-how-can-i-receive-udp-multicast-data-in-matlab-using-instrument-control-toolbox

评论： Walter Roberson 2019-2-25

I am trying to receive UDP multicast packets, but fread() timeout. Thanks.

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Walter Roberson 2019-2-23

I suspect it is not implemented. See https://www.mathworks.com/matlabcentral/answers/91896-is-it-possible-to-connect-to-a-udp-multicast-using-the-instrument-control-toolbox-2-2-r14sp2

xpc (Simulink Real-Time) UDP receive block does support multicast though.

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Answer 1

Munish Raj 2019-2-25

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https://ww2.mathworks.cn/matlabcentral/answers/446531-how-can-i-receive-udp-multicast-data-in-matlab-using-instrument-control-toolbox#answer_362571

Please refer to the below link :

https://www.mathworks.com/matlabcentral/answers/91896-is-it-possible-to-connect-to-a-udp-multicast-using-the-instrument-control-toolbox-2-2-r14sp2#answer_239824

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Walter Roberson 2019-2-25

That is for broadcasting UDP, not for receiving multicast. It relies upon the fact that anything sent to the highest address in your subnet is broadcast to everything on the same physical subnet (by definition these Must Not pass through a router.)

In order to receive multicast, you would either need to somehow go through a proper multicast group registration as defined in the standards, or else you would need to be using a slightly broken IP stack that permitted you to define your interface address as being one of the 224.0.0.x IP addresses, which you are not really supposed to be able to do. The alternative would be to have have privileges enough to register to receive all packets, which would include all multicast packets, and then to throw away everything you were not interested in.

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