How to set up nrf52833 Security 2 Level 2?

[Mikey]

Hi,

I looked at some of the questions on the forum and they didn't give me good advice. Currently all I can do is nrf52832 Security 1 Level 4 and nrf52833 Security 1 Level 3. But according to my bluetooth protocol requirement is Security 2 Level 2 of nrf52833. But I have any good suggestions for finding a proper way to implement it? I use SDK17.1, softdevice s140 7.3.0.

Thank you,

wfagly.

[Mikey]

Should I choose level3 or level4 in security mode 1?

[Emil Lenngren]

The difference between level 3 and 4 is the use of "LE Secure Connections". If you already know that both devices (central and peripheral) support LESC, then do require the use of LESC during pairing, since the legacy methods are all considered unsecure. If you only intend to communicate with Android, iOS and other "big" operating systems, there is no need to support the legacy methods since these systems have support for LESC since a long time ago.