Release 3.6.3 is a significant release, adding major new
capabilities and many bug fixes, while maintaining strict source
compatibility with user code already written for the 3.6 API.
Much of the code was the result of two events, the September 2012 GNU
Radio conference in Atlanta, GA, and the November 2012 GNU Radio
hackfest held at Ettus Research in Mountain View, CA. Additional work
(not discussed here) from these events has been incorporated into the
'next' branch of the code repository, and will become part of the 3.7
API release series.
New features include asynchronous message passing between blocks, new
blocks for interfacing with operating system networking stacks, the
ability to write new signal processing blocks in Python, enhanced file
source and sinks that can store metadata, flowgraph latency control,
improvements to documentation, and further conversion of existing code
into the 3.7 API organization (while leaving existing blocks in
The detailed changelog is here: