If I’m changing the Session Key, does it matter if I set the upper (KU) or lower (KL) first?

            No it doesn’t matter, you can transmit in either order. When the endpoint receives both the upper and lower half of the key it will enable encryption automatically.

            Also note that the KU and KL commands are only used to transmit the session key from the coordinator to an endpoint. It is not used to set the session key directly. To set the session key use the SK command.
            Updated: 18 Sep 2018 10:08 AM
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