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Accurate timer interrupts with working softdevice

Hi,

I am working on nrf52832. I am preparing application where I need to handle central connection with two peripherals and keep tracking time. I know that softdevice has most important interrupt priorities. But I have to perform operations unconnected with BLE services with accuracy of 1ms or even less. I use app_timer now but I am afraid that I can lost some timer interrupts or they can be shifted. After connection to peripherals I ask them for data (once per second).

I think about disable softdevice when BLE is unused but maybe there is other method for achieving my goal - triggering time event precisely.

Regards