Constructs an empty Will Message.

will() = default;
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Construct a Will Message.

will(
    std::string topic,
    std::string message,
    qos_e qos = qos_e::at_most_once,
    retain_e retain = retain_e::no
);
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will(
    std::string topic,
    std::string message,
    qos_e qos,
    retain_e retain,
    will_props props
);
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