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How to detect the nearest peripheral before connecting ?

mikael elharrar
Intellectual 825 points

Other Parts Discussed in Thread: CC2541

Hi guys,

I'm using the cc2541 as BLE central device, but my customer want the central device to automaticaly connect to the nearest peripheral. 

Actualy the central device is a remote control unit, and one of the requierement is:

"If the remote control unit detect several peripheral, it will connect to the nearest ..."

How to do that ? Is the order of discover response can help me ?

Thanks

Mikael

  • 0
    Guru 22270 points

    Hello Mikael,

    You may want to look at the iBeacon source code found in the BLE stack as a guide.  http://www.ti.com/tool/ble-stack

    Plus read through the wiki.

    http://processors.wiki.ti.com/index.php/Bluetooth_SensorTag?INTC=SensorTag&HQS=sensortag-wiki

    Thanks,

  • 0 in reply to Greenja
    Prodigy 190 points

    Hey Mikael,

    Each peripheral device normally transmits its Tx Power value in the advertising event. You could read that and the received RSSI value to calculate the nearest peripheral:

    Distance is proportional to TxPower minus RSSI Value.

    If you have the freedom to program the peripheral devices too, then make sure they expose their transmit power.

    Regards
    Pranjal Saxena