Add protobuf (https://github.com/google/protobuf) and nanopb (https://github.com/metormote/nanopb) to build example beerduino project (https://github.com/ilyevsky/beerduino) using platformio (http://docs.platformio.org/en/latest/).

.gitignore

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+/.pioenvs
+/.sconsign.dblite

.gitmodules

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+[submodule "protobuf"]
+	path = protobuf
+	url = https://github.com/google/protobuf.git
+[submodule "nanopb"]
+	path = nanopb
+	url = https://code.google.com/p/nanopb/

Makefile

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+PROTO_DIR = proto
+GOOGLE_PROTOBUF_INCLUDES = protobuf/src
+NANOPB_DIR = nanopb/generator
+PROTO_INCLUDES = -I$(PROTO_DIR) -I$(GOOGLE_PROTOBUF_INCLUDES) -I$(NANOPB_DIR)/proto
+
+all: nanopb beerduino.pb
+
+nanopb: nanopb_nanopb nanopb_plugin
+	cp nanopb/pb.h src
+	cp nanopb/pb_common.c src
+	cp nanopb/pb_common.h src
+	cp nanopb/pb_decode.c src
+	cp nanopb/pb_decode.h src
+	cp nanopb/pb_encode.h src
+	cp nanopb/pb_encode.c src
+
+nanopb_%: $(NANOPB_DIR)/proto/%.proto
+	protoc --python_out=$(NANOPB_DIR)/proto $(PROTO_INCLUDES) $<
+
+%.pb: $(PROTO_DIR)/%.proto
+	protoc -o$@ $< $(PROTO_INCLUDES)
+	python $(NANOPB_DIR)/nanopb_generator.py $@ -L '#include "%s"'
+	mv -f $@.h src
+	mv -f $@.c src

platformio.ini

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+#
+# Project Configuration File
+#
+# A detailed documentation with the EXAMPLES is located here:
+# http://docs.platformio.org/en/latest/projectconf.html
+#
+
+# A sign `#` at the beginning of the line indicates a comment
+# Comment lines are ignored.
+
+# Simple and base environment
+# [env:mybaseenv]
+# platform = %INSTALLED_PLATFORM_NAME_HERE%
+# framework =
+# board =
+#
+# Automatic targets - enable auto-uploading
+# targets = upload
+
+[env:autogen_uno]
+platform = atmelavr
+framework = arduino
+board = uno
+; targets = upload
+upload_port = COM3

proto/beerduino.proto

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+
+import "nanopb.proto";
+
+package beerduino;
+
+message Ping {
+  required int32 id = 1;
+}
+
+message Echo {
+  required int32 id = 1;
+  optional string message = 2 [(nanopb).max_size = 40];
+}
+

src/main.cpp

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+#include <stdint.h>
+#include "Arduino.h"
+
+extern "C" {
+    #include "pb_decode.h"
+    #include "pb_encode.h"
+    #include "beerduino.pb.h"
+}
+
+void setup() {
+    Serial.begin(9600);
+    Serial.println("Hello.");
+}
+
+void loop() {
+}
+
+void serialEvent() {
+  if(Serial.available()) {
+    int packet_size = Serial.read();
+
+    uint8_t in_buffer[256];
+    int bytes_read = Serial.readBytes((char*)in_buffer, packet_size);
+    if (bytes_read != packet_size) {
+      // Well... fuck
+      return;
+    }
+
+    pb_istream_t istream = pb_istream_from_buffer(in_buffer, bytes_read);
+    beerduino_Ping ping_msg;
+    if(!pb_decode(&istream, beerduino_Ping_fields, &ping_msg)) {
+      // Well... fuck
+      return;
+    }
+
+    beerduino_Echo echo_msg = {ping_msg.id, true, "Hello"};
+
+    uint8_t out_buffer[256];
+    pb_ostream_t ostream = pb_ostream_from_buffer(out_buffer,
+                                                  sizeof(out_buffer));
+    if (pb_encode(&ostream, beerduino_Echo_fields, &echo_msg)) {
+      Serial.write(ostream.bytes_written);
+      Serial.write(out_buffer, ostream.bytes_written);
+    }
+  }
+}
+