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How nRF Connect application able to receive data from different devices via same uuid in same time

Hi. I`m trying to connect two Nortdic Thingy device and receive data in same time(ex. temperature, humidity etc..).

In my application, I can connect two devices in same time but I can only receive data from one device.

I can receive data from different devices(ex. Thingy & other device), but same kind of devices(ex. Thingy & Thingy) does not work.

On the internet, many people say I cannot use same uuid and service character in same time.

But when I test by nRF Connect application, it receives data from two Thingys in same time.

How does it work?

The source code of nRF Connect is not available, so I ask here.

Thanks.

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