Porting TinyCBOR to #NuttX is easy ... Thanks to POSIX Support on NuttX!
https://github.com/lupyuen2/tinycbor-nuttx/blob/main/src/open_memstream.c#L35-L49
@lupyuen MessagePack is also another interesting one (yet another binary and compact alternative to JSON)
#CBOR encodes Sensor Data more efficiently than JSON ... Perfect for #NuttX, LoRaWAN and The Things Network!
https://github.com/lupyuen2/tinycbor-nuttx