Can I update connection parameters to low power settings when connected as an HID to iOS?

[Wavecake]

I use the HID (HOGP) profile for some features of this product. Before the product enters sleep mode, I attempt to update the connection parameters to reduce power consumption with the following settings:

Interval min: 360ms Interval max: 380ms Slave latency: 4 Supervision timeout: 6000

I am finding that iOS consistently ignores these settings. Instead, it forces the connection interval to 15ms. This increases the power consumption dramatically. When I remove the HID service from my code, my request for the exact same settings succeeds. Therefore, it seems to me that iOS prevents HID devices from using low power friendly connection parameters.

Has anyone found a work around for this issue? I understand that iOS would want HID devices to respond quickly. However, I can't believe that they do not support more low power friendly connection parameters for this use case.

[run_ar]

Unfortunately I don't know the maximum interval for HID devices on iOS, and I cannot find it in documentation. So I'm afraid you will have to find out by trial and error

[yuuuhei]

I am having exactly the same issue by iOS13 and HID profile.
Any connection update parameters complying on iOS guideline will be once success, but will be reset immediately to
Connection interval: 15ms, Slave latency: 4, Supervision timeout: 1000ms.
(On OSX, the same connection update parameters can successfully set)

Any work around found for iOS? 

[run_ar]

Hi,

I suspect iOS changes these parameters to make sure the usability is good. Not sure there is anything you can do to fix it. Apart from maybe higher slave latency.

What interval are you trying to get and what type of device are you working on?