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Feature characteristic security #1657
This PR is to add support for configuring security attributes for characteristics. NRF5X devices only as I don't have any ESP device handy (although it is possible to add support for ESP as well).
I've tested this with a BT sniffer, works ok. Once you marked a characteristic rear/write with a security attribute, a secure links gets established automatically when you are trying to read/write for android (I assume for ios as well) and Bluez with generic USB adapters. Bluegiga serial adapter does not establish secure link automatically, a separate pairing procedure has to be run before reading/writing protected characteristics.