About security configuration..

[JoonDong]

Can I configure security parameters my own way?

I read some BLE profile but there are not explain about security configuration.

And I tested by using PCA10028, iPhone4s(ios9), iPhone5s(iso10) and ANSC example.

iPhone5s was connected but not paired when SEC_PARAM_LESC is 1.

but iPhone4s was connected and paired although SEC_PARAM_LESC is 1.

why is this happenning?

remainder of configurations are the same..

[Petter Myhre]

The only example in SDK 11.0.0 that supports LESC is the BLE LE Secure Connections multirole example, so setting SEC_PARAM_LESC to 1 when LESC is not supported is not recommended.

I'm not sure why you see different behavior with the two iOS deivces, sniffer traces could shed some light on it though.

[Petter Myhre]

I don't have a general guideline, if you have specific questions I can try to answer them. What BLE specs are you referring to? The Bluetooth Core specification? What is the ANP spec? If you are referring to a specific profile, you should implement it according to the spec, if not, there is no point in following it, because of interoperability. You can of course implement your own proprietary profile, but then other venders may not be able to communicate with your device.