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Nanopb is a plain-C implementation of Google"s Protocol Buffers data format. It is targeted at 32 bit microcontrollers, but is also fit for other embedded systems with tight (2-10 kB ROM, <1 kB RAM) memory constraints. Nanopb supports static memory allocation, i.e. you don"t need a malloc implementation and can be sure of the memory requirements of your code. Nanopb project has moved Due to Google Code closing down, nanopb project is now hosted on GitHub: https://github.com/nanopb/nanopb Status The nanopb core is stable, well tested and supports the following features: All protobuf data types Required, repeated and optional fields Packed arrays Nested submessages Default values for fields Extension fields Releases Stable releases of the library are released approximately once a month, unless there are no new developments: <