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You can download version 2.2 of dcled and use it to send text to the message board under Linux, Mac OS X 10.5.6, and perhaps other operating systems for which you can compile libusb. Dcled is a userland program, and shouldn't require any kernel recompiling at all, but you will require the libusb-1.0-dev pacakge to be installed.
brew install dcled
The following dependency will be installed if you install Dcled:Libhid.