nanopb-arduino

A simple PlatformIO library for wrapping Arduino's Stream and Print objects into Nanopb's pb_istream_s and pb_ostream_s.

Exposes two functions that do exactly what you'd expect:

• pb_istream_s as_pb_istream(Stream& p)
• pb_ostream_s as_pb_ostream(Print& p)

In most cases, all you'll need is:

#include <pb_arduino.h>

pb_istream_s pb_in = as_pb_istream(Serial);
pb_ostream_s pb_out = as_pb_ostream(Serial);

and then use pb_encode(&pb_out, ...) and pb_decode(&pb_in).

This isn't restricted to Serial, and will work for any object that implements Stream, such as File (returned from SD.open and the ethernet Client.

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This can be used on top of PacketIO, with

#include <pb_arduino.h>
#include <cobs/Stream.h>
#include <cobs/Print.h>

COBSStream cobs_in(Serial);
pb_istream_s pb_in = as_pb_istream(cobs_in);

COBSPrint cobs_out(Serial);
pb_ostream_s pb_out = as_pb_ostream(cobs_out);

and then calling cobs_out.end() after each pb_encode, and cobs_in.next() after each pb_decode.