[IOS & MacOS] RequestMtu doesn't work like expected

[Sravdar]

Tested and built on "Mac Mini m4", Flutter 3.27.1, xcode 16.2, universal ble 0.14.0
İphone 7, ios 15.8.3

On both of the devices i got the same behaviour.

On first RequestMtu call after boot and hot restarts it throws exception

PlatformException(IllegalArgument, Unknown deviceId:<_TtC13universal_bleP33_7F14D50205415E5D4F8E2E2076A78ED716BleCentralDarwin: 0x15166b6e0>, null, null)

On following calls it doesn't throw exception but also doesn't set the mtu to target value and returns "23". Thing is peripheral device says mcu is set to its prefered value "495".

[Sravdar]

I found the reason for the exception. I was calling RequestMtu in "onConnectionChange" callback. I think it causes some kind of race condition with connect function.

Second part still stays same. It returns "23" while peripheral is saying "495".

[Sravdar]

I have found the cause. Calling 'requestMtu' before 'discoverServices' was causing this problem.

But something to note is in example project i realized even though expected mtu is set to "247" i still get highest possible mtu. Not sure if this is intended or bug.