CODEWITHSUNDEEP
androidbluetoothbluetooth-lowenergyhandshake
user3867743
user3867743

Reputation: 87

When two Bluetooth devices are connected, does either of them reply to any Inquiry scan, or send an Inquiry?

I am trying to answer the following question?

When two Bluetooth devices are connected, does either of them reply to any Inquiry scan, or send an Inquiry?

I had a few experiments and my answer is no. I connected two BT devices and try to pick any BT device nearby by my other phone which it did not detect any of them.

It would be great if you could also support your answer by a referencable document.

I have looked at several docs like these: http://essay.utwente.nl/59681/1/MA_scriptie_A_Franssens.pdf https://link.springer.com/content/pdf/10.1007%2F978-0-387-75462-8_20.pdf

but could not find a straight answer.

Upvotes: 0

Views: 405

Answers (2)

Mike Petrichenko
Mike Petrichenko

Reputation: 1024

Yes, Bluetooth device can scan/enquiry and send scan/enquery response when connected. However, most cells designed so that it can be discovered only when you have Bluetooth settings opened. This is not Bluetooth limitation but OS design.

If we are talking about headsets (or keyboard or any other HID device) then this is reasonable why manufacturer made it so it can pair/work with only single device. But this is just a manufacturer decition and made so by design. It is not Bluetooth limitations. If you need you can design such headset that can be paired and connected to few devices t the same time.

On high-level Bluetooth device can be in Discoverable and/or in Connectable modes. Discoverable mode makes device visible to other devices. Connectable mode allows to connect to the device.

Usually manufacturer design it so that is device is not paired (or when you press special button or open Bluetooth settings on cell) it stays in Discoverable mode. So other devices can discover (find) the headset/cell. Once you paired with your device the Discoverable mode switched off. So now you can connect to device (cause during pairing the MAC is stored and you do not need to rediscover the device).

Once you connected the device turns Connectable mode off so others can't find and connect to it.

But once again. This is how manufacturer designed device. It is not Bluetooth limitation.

Bluetooth Core Specification

Upvotes: 1

Andrey
Andrey

Reputation: 21

I know that you can connect and interact with multiple bluetooth low energy devices without problems. I myself connected to at least three ble devices and could easily receive and send data.

Upvotes: 1

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