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Apple Connection Guidelines

Hi Nordic Guy,

I'm trying to fine tune my connection parameters for better battery life, while at the same time trying to keep them within Apple's guideline. I notice in their Bluetooth Design Guidelines that they have 5 conditions to "abide" by. I was wondering if anyone could shed some light on this one condition:

Interval Min + 20 ms ≤ Interval Max Slave Latency ≤ 4

It seems a little ambiguous to me, and I'm a little bit confused by the middle term, Interval Max Slave Latency. Am I supposed to multiply those two values? Or add them? Or is the interval max slave latency some sort of parameter on its own? As it stands I have a slave latency of 0, which would immediately mean I am not meeting the requirement. What is that middle term exactly?

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