This is a simple example for encoding Google Protocol buffers using nanopb C library.

This project is using submodule for nanopb folder. Use --recursive command for clonning or use git submodule init.

You have to install protoc Google Protocol buffers compiler. It is internally used by nanopb.

Edit your message.proto file. Set values of your fields in main.c and run build.sh. Script rebuilds the .proto file, builds project and executes ./a.out.

Example output:

Length: 45
086410031A090801120548656C6C6F1A090801120548656C6C6F1A090801120548656C6C6F220608F60410CE09

In the node_protob_decoder/ folder there is a simple decoder. You have to manually edit line containing hexadecimal message b = Buffer.from('08641003', 'hex'); and then run the script by:

cd node_protob_decoder
npm install
node main.c

Example output

<Buffer 08 64 10 03 1a 09 08 01 12 05 48 65
6c 6c 6f 1a 09 08 01 12 05 48 65 6c 6c 6f 1a
09 08 01 12 05 48 65 6c 6c 6f 22 06 08 f6 04
10 ce 09>
{
    "luminance": 100,
    "hwRevision": "PB_REV1_2",
    "inputs": [
        {
            "state": true,
            "name": "Hello"
        },
        {
            "state": true,
            "name": "Hello"
        },
        {
            "state": true,
            "name": "Hello"
        }
    ],
    "voltage": {
        "battery": 630,
        "external": 1230
    }
}

This project is licensed under the MIT License - see the LICENSE file for details.

Made with ❤  by HARDWARIO s.r.o. in the heart of Europe.