Add a IEEE 802.15.4 like decoder, which supports
the IEEE 802.15.4 standard but also a large variety
of ICs based on this framing scheme. Such framings
are quite common in many Cubesat missions.
The decoder has been tested an works well with at least
the Reaktor Hello World satellite
The decoders produce a PMT message containing several information about
the decoded frame. While this is very convenient for handling data
inside the flowgraph, it is not for third party applications. The JSON
converter block is responsible to serialize all the information
contained in a PMT originating from a decoded frame.
For simple demonstration some metadata were added on the AX.25 decoder.
These metadata are still a WIP and they subjected to changes.
For now the generic clear text message sink just prints the decoded
clear text messages in the stdout. In the future and depending the needs
of the project, the clear text messages can be forwarded at other
services on the same host or via the network.
Also the debug message source block now supports injection of artificial
errors, for more robust decoding of the Morse decoder block.