The iocp_bt package implements Bluetooth client channels on Windows.
EB: Ashok, thanks a lot for this new package with good documentation, which brings again more Windows functions in Tcl. I haven't tried the bluetooth part yet, but iocp rings my bell so I tried the @iocp::inet@ package. As noted in the documentation, The only enhancement offered by this command is significantly improved performance with reduced CPU load, and just that is enough!
I tried it in a custom socket messaging library, I confirm it worked identically in an application, but my connection is too limited to evaluate the performance. I also did a simple data exchange test on localhost, for which it is 2 times faster than using stock socket.