customCborEncoder.ino

/*
    This file is part of the Arduino_CloudUtils library.

    Copyright (c) 2024 Arduino SA

    This Source Code Form is subject to the terms of the Mozilla Public
    License, v. 2.0. If a copy of the MPL was not distributed with this
    file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/

#include <Arduino_CBOR.h>

enum : MessageId {
    CBORTestMessageId = 0x0123,
};

enum : CBORTag {
    CBORTestMessageTag = 0x0321,
};


struct CBORTestMessage {
    Message m;
    char parameter[20];
};

class CustomMessageEncoder: public CBORMessageEncoderInterface {
public:
    CustomMessageEncoder()
    : CBORMessageEncoderInterface(CBORTestMessageTag, CBORTestMessageId) {}

protected:
    MessageEncoder::Status encode(CborEncoder* encoder, Message *msg) override {
        CBORTestMessage * testMessage = (CBORTestMessage *) msg;
        CborEncoder array_encoder;

        if(cbor_encoder_create_array(encoder, &array_encoder, 1) != CborNoError) {
            return MessageEncoder::Status::Error;
        }

        if(cbor_encode_text_stringz(&array_encoder, testMessage->parameter) != CborNoError) {
            return MessageEncoder::Status::Error;
        }

        if(cbor_encoder_close_container(encoder, &array_encoder) != CborNoError) {
            return MessageEncoder::Status::Error;
        }
        return MessageEncoder::Status::Complete;
    }
} customMessageEncoder;

void setup() {
    Serial.begin(9600);
    while(!Serial);

    CBORMessageEncoder encoder;
    uint8_t buffer[100]; // shared buffer for encoding
    uint8_t expected[] = {0xD9, 0x03, 0x21, 0x81, 0x66, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66};
    const size_t buf_len = sizeof(buffer);

    CBORTestMessage cmd {
        CBORTestMessageId,
        "abcdef",
    };
    size_t res_len=buf_len;
    MessageEncoder::Status res = encoder.encode((Message*)&cmd, buffer, res_len);

    if(res == MessageEncoder::Status::Complete &&
        memcmp(buffer, expected, res_len) == 0) {

        Serial.println("Encode operation completed with success");
    } else {
        Serial.println("Encode operation failed");
    }
}

void loop() {}