iOS BLE disconnect repeatedly wuth connection has timed out unexpectedly

[HinnaX]

Hey,
since iOS version 18.6.2 the BLE connect to our BLE peripherial with nrf52840 getting disconnect events.
Also the range between them is very bad.
The connection parameter are set with these values

CONFIG_BT_PERIPHERAL_PREF_MIN_INT=12

CONFIG_BT_PERIPHERAL_PREF_MAX_INT=12

CONFIG_BT_PERIPHERAL_PREF_LATENCY=3

CONFIG_BT_PERIPHERAL_PREF_TIMEOUT=200

These are conform the apple connection parameter quidelines

developer.apple.com/.../_index.html

Can anybody help?

[Benjamin]

Hi,
Why would you not be able to do a trace? You can easily do it with a DK. nRF-Sniffer-for-Bluetooth-LE
Also, do you experience the same issue with iOS 26?

[HinnaX]

Hey Benjamin,
thanks again for your reply. We testet it again and it happens sometimes that the connection will be lost.
We test it now with iOS 26, so the iOS Update doesnt change anything.
I've createad a sniffer trace.

iOS_26_connection_lost_nrf52840.pcapng