Difference between Master & Slave in in BLE

Montasser Barhoumi

Prodigy 120 points

Hi,

could you please give me a detail difference between Master & Slave in bluetooth low energy technology?

Regards.

over 13 years ago

0 Fredrik K over 13 years ago

TI__Guru** 106705 points

Hi Montasser,

You will find the answer to your question in CC2540/41 BLE Software Developer’s Guide.

/Fredrik

0 J Lindh over 13 years ago

TI__Guru 57865 points

Hi Montasser,

Master and slave are both Link Layer states in Bluetooth low energy.

Typically;

A Central device goes through the Link Layer states Scanner -> Initiator -> Master
A Peripheral device goes through the Link Layer states Advertiser -> Slave

So essentially, Master and Slave terms does not "exist" until two devices are connected. Since Bluetooth low energy is a star topology, a Master can be connected to several slaves whilst a slave can only be connected to one master. Furthermore it's the Master who manages the connection.

I hope I answered you :)

Best Regards

0 Montasser Barhoumi over 13 years ago in reply to J Lindh

Prodigy 120 points

Hi Nick,

Thanks a lot for your quick and good answer; just I think you are missing the difference between mater and slave when establishing security.

Could you please treat this part?

Best regards

0 Fredrik K over 13 years ago in reply to Montasser Barhoumi

TI__Guru** 106705 points

Hi Montasser,

Please read Bluetooth 4.0 Core Spec Volume 6, Part B, Chapter 5.

Regards,

Fredrik

Bluetooth®︎

Bluetooth forum

Difference between Master & Slave in in BLE