Thanks for sharing! 

We have analysed similar pattern in many IoT devices and presented periodicity in IoT traffic as FFT  (fig 4 - of IoTDI paper attached for reference)  and some initial results here in this report:
https://www.repository.cam.ac.uk/handle/1810/284092
and full paper is here:
https://dl.acm.org/doi/10.1145/3302505.3310082

Best regards,

On Thu, Mar 19, 2020 at 10:31 AM Mirjam Kuehne <mir@ripe.net> wrote:
Dear colleagues,

IoT devices often perform activities on a periodic basis. Thymen Wabeke
of SIDN Labs shares his analysis of periodic network traffic from IoT
lightbulbs. Read it on RIPE Labs at:

https://labs.ripe.net/Members/thymen_wabeke/visualisations-of-periodic-iot-traffic

Kind regards,
Mirjam Kühne
RIPE NCC

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