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The Multicast example does always use the default multicast address (224.9.9.2), even if the address is set to another multicast address. How to set the multicast address? REPEAT BY: Change the multicast address in the constructor of Client class (ftp.cpp) to 224.9.9.0 as an example and run the example.
When looking at the code I would suggest you try to use the -a commandline option. For example -a 224.9.9.0
Also the -a parameter isn't working.
I will take a look at it in the next couple of days and get back to you.
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