How do I change connection interval with core bluetooth.

hello, everyone..

I'm developing BLE(BT4.0) App with CC2540 and new iPAD.

I know that the keyfob demo(TI supported source) program can change connection interval for iOS.

But

I have some question. It's like below.

1. (CC2540 <------> iPAD)

Could I change connection interval to 20ms(maybe it's min value) in iOS with core bluetooth?

I couldn't find it anywhere and it was posslible in the keyfob demo source only.

2. (iPAD <--------> iPAD)

if I use two iPAD(one is master, the other one is slave), where I can set connection interval value?

I don't know what is default connection interval value in core bluetooth.

I read many threads and documents for a while but I didn't get appropriate answer.

In apple's document,

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Interval Max * (Slave Latency + 1) ≤ 2 seconds

Interval Min ≥ 20 ms

Interval Min + 20 ms ≤ Interval Max

Slave Latency ≤ 4

connSupervisionTimeout ≤ 6 seconds

Interval Max * (Slave Latency + 1) * 3 < connSupervisionTimeout

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above things can be set only slave side like below,

In TI source,

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// Minimum connection interval (units of 1.25ms, 80=100ms) if automatic parameter update request is enabled
#define DEFAULT_DESIRED_MIN_CONN_INTERVAL 80

// Maximum connection interval (units of 1.25ms, 800=1000ms) if automatic parameter update request is enabled
#define DEFAULT_DESIRED_MAX_CONN_INTERVAL 800

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is it true?

I want to change it in core bluetooth or iOS App too.

please, give me answer...

- YOUNG JIN