ICMP example detects RANDOM address as PUBLIC

[gsalazar]

I am using a nrf52840 dev kit with the ICMP example and a linux host using a nrf52832 with the Zephyr stack as a controller. The linux host scans for the dev kit and connects however the ICMP always detects that the controller is using a PUBLIC address however, in the linux host I see it is using a RANDOM one and when I use a different device to connect it detects a RANDOM one. 
How can I check this in the NRF SDK stack? Has anyone had this problem before? Shouldn't I detect it as RANDOM peed address?

Thank you

[Jørgen Holmefjord]

Hi,

Please have a look at this answer.

Best regards,
Jørgen

[gsalazar]

Hi Jørgen, 

I don't think I made myself clear, I understand that the example appears with a PUBLIC address on the linux host, that is ok.

However the linux host has a RANDOM address and it is detected on the dev kit as a PUBLIC one, should it also use a PUBLIC address, do I need to set that bit also? 

[Jørgen Holmefjord]

Where are you checking the address on the DK? The bit TxAdd in the advertising PDU header should indicate if the address is public or private. I don't know how this is set on the Linux host side.

[gsalazar]

In the ble_6lowpan.c file, in line 1690 in the IPV6_EUI64_CREATE_FROM_EUI48 macro, the p_evt->p_evt_param->p_peer->addr_type  has value 0 which corresponds to PUBLIC address when it should be 1 as RANDOM

[Jørgen Holmefjord]

Have you checked the on-air packets if the TxAdd bit is set, for instance using a sniffer? I would suspect this parameter to be decided by the softdevice based on this bit.