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Advertising interval time test

Hi Sir/Miss,

We want to test advertising interval time of peripheral device to follow APPLE accessory guideline.

We found some topic on forum, it mentions that uses sniffer is better than nrf connect APP.

https://devzone.nordicsemi.com/f/nordic-q-a/23586/how-can-i-measure-the-advertising-intervals-of-a-peripheral

I set up advertising interval as below on original example code.

EVB: PCA10040

SDK: 15.2

SES: 3.40

Softdevice: s112 

Use project: ble_app_uart  pca10040e

But, we use nrf51 dongle to be sniffer to check interval on following "nRF_Sniffer_User_Guide_v2.1.pdf".

Wireshark version: 2.6.1

environment: sheilding box

Each time delta of data is different, but not near 20 ms. All of data is lower than 20 ms.

How do I check advertising intervals?

Thank you.

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