Do you have a CBOR implementation that you like? Ideally one with decent schema support? I was looking into CBOR as a replacement for Protobufs for an embedded system I work on and it's got a lot going for it but every implementation I looked at seemed to support a very different subset of the schema spec and it was brutal to try to find a pair of libraries (C for the embedded side, C++ for the host side) that could actually share a set of schema files.