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If you have a message that defined as empty, but attempt to decode a message that has one or more unknown fields then pb_decode fails. The method used to count the number of required fields counts 1 required field because the default type of PB_LAST_FIELD is PB_HTYPE_REQUIRED.
Nanopb is a small code-size Protocol Buffers implementation. Homepage: http://kapsi.fi/~jpa/nanopb/ To compile the library, you'll need these libraries: protobuf-compiler python-protobuf libprotobuf-dev The only runtime dependencies are memset() and memcpy(). To run the tests, run make under the tests folder. If it completes without error, everything is fine.