Import of the watch repository from Pebble

third_party/nanopb/examples/platformio/platformio.ini

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+;
+; You can setup `custom_nanopb_protos` `nanopb_options` vars to generate code from proto files
+;
+; Generator will use next folders:
+;
+;   `$BUILD_DIR/nanopb/generated-src` - `*.pb.h` and `*.pb.c` files
+;   `$BUILD_DIR/nanopb/md5` - MD5 files to track changes in source .proto/.options
+;
+; Compiled `.pb.o` files will be located under `$BUILD_DIR/nanopb/generated-build`
+;
+; Example:
+
+[env:pio_with_options]
+platform = native
+lib_deps = Nanopb
+
+src_filter =
+    +<pio_with_options.c>
+
+; All path are relative to the `$PROJECT_DIR`
+custom_nanopb_protos =
+    +<proto/pio_with_options.proto>
+custom_nanopb_options =
+    --error-on-unmatched
+
+[env:pio_without_options]
+platform = native
+lib_deps = Nanopb
+
+src_filter =
+    +<pio_without_options.c>
+
+; All path are relative to the `$PROJECT_DIR`
+custom_nanopb_protos =
+    +<proto/pio_without_options.proto>
+
+
+[env:pio_esp32_idf]
+platform = espressif32
+board = firebeetle32
+framework = espidf
+lib_deps = Nanopb
+
+; Warning: the 'src_filter' option cannot be used with ESP-IDF. Select source files to build in the project CMakeLists.txt file.
+; So, we specified source files in src/CMakeLists.txt
+
+custom_nanopb_protos =
+    +<proto/pio_without_options.proto>