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app_timer vs rtc and ant+ Question

Hello.

I use S332 softdevice and sdk 15.3.0 version

I test multiprotocol ble and ant+ in one 52832.

1. I opend ant+ 2 channel for master. one is speed and one is cadence.

it almost open at the  sametime. however periodly two channel happend collision event. maybe the period is 2min or more later.

If one channel happen collision, other one can send data.

i know the cause is similiar channel period. but i wanna solve or know how to less happen collision.

2. I use ble cccd func. and it use app_timer.(reference example) and another one is i use rtc driver.

I knew rtc0 is softdevice, rtc1 is app_timer, rtc2 is whatever.

now i wanna more less consumption .

is it possible rtc func is replaced app_timer func?( like per one minute call handler func)

therefore if i use only softdevice and rtc, it is less consumption than softdevice + app_timer + rtc ?

3. at master , how to check slave is connect or not?

is it impossible? because master is just broadcast?

Thank you for your reply

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