A simple ProtocolIO 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.

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.