Bluetooth Latency / Notify Timing

[dlktdr]

Hello,

Wondering if anyone can help be on this.

I have a Bluetooth project running on Zephyr (nrf52840) https://github.com/dlktdr/HeadTracker. What I'm trying to do is send out a notify at a very consistent rate. Apx 60hz ideally. If there is a little latency isn't the end of the world, consistent timing is more important. I know this isn't BLE's best feature but hope there is some way to get a bit better.

I'm having a problem getting any better results, there are so many Bluetooth settings I'm not sure what to try next or if this just the best it's going to get.

I have set the Connection intervals to min 6 max 10, but adjusting it more doesn't really solve the issue. but it's just not consistent. (Photo of the stepping it causes here headtracker/HeadTracker#63 (comment))

Current BT Parameters

CONFIG_BT=y
CONFIG_BT_SMP=y
CONFIG_BT_PERIPHERAL=y
CONFIG_BT_CENTRAL=y
CONFIG_BT_GATT_CLIENT=y
CONFIG_BT_CTLR_TX_PWR_PLUS_8=y
CONFIG_BT_DEVICE_NAME="Hello"
CONFIG_BT_GAP_AUTO_UPDATE_CONN_PARAMS=y
CONFIG_BT_L2CAP_TX_MTU=100
CONFIG_BT_CTLR_PHY_2M=n
CONFIG_BT_CTLR_RX_BUFFERS=2
CONFIG_BT_CTLR_DATA_LENGTH_MAX=50

Thank you for any help.