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Using OSC, I can set LED's on, control the board, etc. but I can not get any messages back. Why not?

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Are you running a firewall on your machine? Random UDP packets (such as OSC generates) from the outside are exactly what firewalls are on the lookout for. If you either turn your firewall off, or better, add an exception for the OSC port (10000 by default) you're listening on, the firewall will leave these packets alone.