Import("env") # Encode cyclic messages with callback fields c = Copy("$TARGET", "$SOURCE") env.Command("cyclic_callback.proto", "cyclic.proto", c) env.NanopbProto(["cyclic_callback", "cyclic_callback.options"]) enc_callback = env.Program(["encode_cyclic_callback.c", "cyclic_callback.pb.c", "$COMMON/pb_encode.o", "$COMMON/pb_common.o"])