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If any part of the code had a packet object and called prepare() on it, it would create a msgNo if it wasn't set. Sometimes we get packets on the wire/RF that don't have a msgNo, so adding one locally is wrong. We should ONLY create a msgNo on a packet that is destined for transmission. This patch ensures that even if prepare() is called, that only packets that are created locally for TX get a msgNo unless it already exists from RX'd packets.