Nanopb

The $pw_external_nanopb/ module contains Nanopb, a tiny protobuf library. It is used by pw_protobuf_compiler.

Follow the documentation on pw_protobuf_compiler for general help on how to use this.

GN Build Support

This module provides support to compile Nanopb with GN.

Enabling PB_NO_ERRMSG=1

In your toolchain configuration, you can use the following:

pw_third_party_nanopb_CONFIG = "$pw_external_nanopb:disable_error_messages"

This will add -DPB_NO_ERRMSG=1 to the build, which disables error messages as strings and may save some code space at the expense of ease of debugging.

CMake Build Support

This module provides support to compile Nanopb with CMake.

It defines the pw_third_party.nanopb interface target, which one can link against to use nanopb.

The CMake variable dir_pw_third_party_nanopb must be set to point to a local nanopb installation.

In a Zephyr build, one should enable the Nanopb Zephyr module and enable the CONFIG_NANOPB KConfig option. In this case dir_pw_third_party_nanopb will be automatically set.