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.(http://koti.kapsi.fi/jpa/nanopb/)

How to use the example:
	1. move examples/nanopb to bsp/xxxx/
	2. enable macro RT_USING_NANOPB in rtconfig.h
	3. regenerate the project file (scons --target=xxxx)
	4. rebuild the project

examples/nanopb/SConscript

@@ -0,0 +1,13 @@
+Import('RTT_ROOT')
+Import('rtconfig')
+from building import *
+
+src	= Split('''
+simple.c
+simple.pb.c
+''')
+CPPPATH = [RTT_ROOT + '/examples/nanopb']
+
+group = DefineGroup('Nanopb_test', src, depend = ['RT_USING_NANOPB'], CPPPATH = CPPPATH)
+
+Return('group')