NM, figured it out
What did you figure out? I’m looking to do something similar with a Nano IoT.
@pcarney Welcome to the forum.
Pairing is an optional feature in BLE and not supported by the ArduinoBLE library.
You could implement an application level protection by implementing a characteristic that needs to be written within a certain amount of time with some secret information. If that does not happen the peripheral can disconnect the central.
Once the information is confirmed you make the data available in the other characteristics.
Perfect. Thanks. Good to know it’s not supported and thanks for the suggested implementation! 
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