How to add new decoders to DEFS?

[esutton]

Thank you for sharing your work!

If I wanted to create new decoders, can you please point me to the spec that defines how they are encoded?

No Decoder for 1007        1007 | Antenna Descriptor
No Decoder for 1019         1019 | GPS Broadcast Ephemeris (orbits)
No Decoder for 1020         1020 | GLONASS Broadcast Ephemeris (orbits)
No Decoder for 4094

This helped:
https://www.use-snip.com/kb/knowledge-base/an-rtcm-message-cheat-sheet/