farble1670

If you already know Java and are just looking for a mapping of the Java concept to Kotlin, this will help.

+---------------------+--------------------------------+--------------------------+-----------------------+------------------------+
|                     |                            JAVA                           |                    KOTLIN                      |
|      Pattern        +--------------------------------+--------------------------+-----------------------+------------------------+
|                     |       Declaration-site         |         Use-site         |    Declaration-site   |        Use-site        |
+---------------------+--------------------------------+--------------------------+-----------------------+------------------------+
| Covariant (out)     | class Box<T extends Animal>    | Box<? extends Animal>    | class Box<out T>      | Box<out Animal>        |
+---------------------+--------------------------------+--------------------------+-----------------------+--------

farble1670

Bluetooth security cheat sheet

BR/EDR

Security Mode	Level 1	Level 2	Level 3	Level 4
Mode 1 (no security)	No authentication No encryption	N/A	N/A	N/A
Mode 2 (service-level security)	No authentication No encryption	Authentication No encryption	Authentication Encryption	N/A
Mode 3 (link-level security)	Authentication Encryption	N/A	N/A	N/A
Mode 4(SSP-based service-level security)	N/A	Unauthenticated pairing (no MITM protection)Encryption	Authenticated pairing (MITM protection)Encryption	Authenticated pairing (MITM protection)EncryptionSecure connections