Without the code of the module, I'm going to guess that the module is not exporting the ConnectFSQ() sub. When you call it from your script, the error is saying that ConnectFSQ() is not found in your script's namespace.

Try:

my $IP_FSQ = "xxx.xxx.xxx.xxx";    # ip address 

... (blah blah blah) 

rns_fsq_jw::ConnectFSQ($IP_FSQ);
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