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If you are passing 192.168.1.100 as the address then it won't work. You need to pass PPT0@192.168.1.100. Also, are you calling tracker.getYPos() multitple times or just once? Keep in mind that the first time you call it there might not be any data received yet.
You should also verify that the PPT computer is actually sending data. Go into the options screen of PPT and make sure the COM port option is set to VRPN. Then make sure PPT is actually sending data by pressing the Talk button.
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