The constraint Minimum Connection Interval + 20 ms ≤ Interval Maximum Slave Latency ≤ 4
Minimum Connection Interval + 20 ms ≤ Interval Maximum
Slave Latency ≤ 4
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Here is the link to the updated release of BLE advertising and connection parameters guidelines from Apple. https://developer.apple.com/library/content/qa/qa1931/_index.html
It changed from connection interval minimum of 20ms to 15ms. You will also find there the link to the complete document.