Abnormal connection update request PDU from slave

[Jusang Kim]

20170119_104909.jpg

I'm working with a ble open source. Here i attached the captured abnormal case of the connection update Request PDU from the slave. Please refer to the attached picture. The slave shall not send the connection update request control PDU to master as i know.

Please feel free to tell me what you think about the abnormal case?

[Sigurd]

Hi,

In the direction field you can see that the packet is sent from the master to the slave...( M -> S)

[Jusang Kim]

In the attached figure the packet number 193 is sent from master to slave. Howevrr the packet number 196 must be sent from salve to master. and then because the master has received the connection update request from the slave, it sent the unknown response to slave. Based on the specification, the slave shall not send the connection update request. It Can send only the connection parameter update request by using the L2CAP channel. This is what i curious about. . .

[Sigurd]

Only the central should send the LL_CONNECTION_UPDATE_REQ. Are you sure that the slave/peripheral is sending the the LL_CONNECTION_UPDATE_REQUEST ? The direction is marked as "?". What devices are you using? is both nRF-devices?

[Jusang Kim]

I'm using a nrf52 DK in the central role and a arduino uno in the slave role with an BLE open-source from the github which means the nRF52 Dk does not make any problem. And the direction of the connection update req is the salve to the central when checking the direction with Ellisys BLE analyzer. I think that the BLE open-source that i'm using has a bug on this issue.

[Sigurd]

Ok, I would then recommend that you summit your bug report as an issue on the GitHub repo where you found the code.