encryption affect on Link Layer packets size

[Samer Mattar]

Hi,

I use the nrf52 to connect to a central using BLE 4.0 where power consumption is a sensitive issue.
I want to understand how encryption will increase the Link Layer packet size in order to understand the effect of encryption on power consumption.

can anyone help?

[bjorn-spockeli]

Hi Samer, 
encrypting a link will not increase the link layer packet size. The encryption procedure, also referred to as paring, will require information to be sent between the BLE Central and the BLE peripheral, so I would recommend that you bond the peripheral with the Central (store the encryption key in internal memory) to avoid performing the encryption procedure on every re-connection. 

Best regards

Bjørn