https://devzone.nordicsemi.com/f/nordic-q-a/71086/ble-hid-ios-connection-interval-15ms---11-25msMy goal is 11.25 ms for connection interval with iOS. With PC and Android i can setup it. Following Apple guideline, I added HID service to my custom device(it works, i can send keys press). iOS decreased connection interval to 15 ms, when i added HIDen-USTelligent Community 13Mon, 01 Feb 2021 12:54:53 GMThttps://devzone.nordicsemi.com/thread/292221?ContentTypeID=1Mon, 01 Feb 2021 12:54:53 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d721f5ee-c884-4c20-9cf0-243476015f99Mtz<p><span>But Apple have phrase in their guide:&nbsp; &quot;connection interval down to 11.25 ms may be accepted by the Apple product.&quot;</span></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/292204?ContentTypeID=1Mon, 01 Feb 2021 12:20:50 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3bc272e3-be50-4094-bce8-dcf1f13a0b69Kenneth<p>Seems like 15ms is a kind of hard limit yes, even from:<br /><a href="https://developer.apple.com/library/archive/qa/qa1931/_index.html">https://developer.apple.com/library/archive/qa/qa1931/_index.html</a></p> <p>Kenneth</p><div style="clear:both;"></div>