Saving BLE bounding information in Flash for CC2564B

AntonNadezhdin

Other Parts Discussed in Thread: MSP430F5229

Hi TI,

I have a question about saving bounding information in the flash. I`m using CC2564B with MSP430F5229. How do I change the code and what variables should I save and restore to flash for saving the bounding information to flash when using SPPLE_Demo_Lite based code? It seems that this project regenerate LTK key every connection what`s why I can`t understand the pairing process in BLE. In addition I was add:

GAP_LE_Request_Security(BluetoothStackID, ConnectionBD_ADDR, lbtBonding, LE_Parameters.MITMProtection, GAP_LE_Event_Callback, 0);

to "case etLE_Connection_Complete" in GAP_LE_Event_Callback for requesting the pairing request from Master device.

How do I change the code and save it in a flash

over 10 years ago

0 Joseph Gigi over 10 years ago

TI__Guru* 85400 points

Hi,

Basically, I think you need to store the "DeviceInfoList" to flash. I think the SPPLE_Demo_Lite sample app does not save the LTK to DeviceInfoList. You can refer to the "SPPLE_Demo" app which does this.

Regards,
Gigi Joseph.

0 AntonNadezhdin over 10 years ago in reply to Joseph Gigi

Intellectual 420 points

If I understand correctly, the slave in BLE connection should not keep any key?

0 Joseph Gigi over 10 years ago in reply to AntonNadezhdin

TI__Guru* 85400 points

Hi,

Where did you see this?
I think not... As per BT Spec:

"The slave device shall store the mapping between EDIV, Rand and LTK in a
security database so the correct LTK value is used when the master device
requests encryption. Depending upon the LTK generation method additional
information may need to be stored, for example the size of the distributed LTK."

Regards,
Gigi Joseph.

0 AntonNadezhdin over 10 years ago in reply to Joseph Gigi

Intellectual 420 points

If so, there are no code for saving LTK even in RAM for the SPPLEDemo project. The DeviceInfo struct contain LTK only when device is a master.

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Saving BLE bounding information in Flash for CC2564B