There is a question about authentification with PIN (bonding) two devices (periferal and central).
I can’t find in documentation anywhere.
Simple task: connect to periferal device with some credentials, send/get data.
If credentials incorect - nothing happens.
On ESP32 that is pissible, but on Particle can’t find.
BLE encryption is not supported at this time.
Thanks @rickkas7 . But that is so sead, because Particle have good product which is unprotected from BLE side communication 
and I can’t use for non-hobby apps.
Is Particle have solution/plan what to do in that situations?
We are looking into supporting BLE encryption in the future, but there is no specific timeframe yet.