Hi,
it worked this way:

===
char* payload = new char[1024];
Message msg = MessageBuilder()
                  .setAllocatedContent(payload, 1024)
                  .build();
producer.sendAsync(msg, [p = payload](Result res, const MessageId&
messageId) {
    if (res == ResultOk) {
        // message was published correctly
    } else {
        // publish error
    }
    delete[] p;
});
===

Thank you for the suggestion

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