nrf52840 pdk multirole

RE: nrf52840 pdk multirole

nahro — Wed, 04 Apr 2018 12:03:15 GMT

Hi Hung,

Yes it works, I do not know what to mark as answer 😃

RE: nrf52840 pdk multirole

Hung Bui — Wed, 04 Apr 2018 10:51:41 GMT

Hi Nahro,

Sorry for the late response, it's been the Easter vacation last week.I don't see any reason that wouldn't work. You can have a look at this sequence chart to see how bonding with passkey work (in this case we skip the part that User enter the passkey)

RE: nrf52840 pdk multirole

nahro — Wed, 28 Mar 2018 13:39:39 GMT

The peripheral is BLE_GAP_IO_CAPS_DISPLAY_ONLY and the central is BLE_GAP_IO_CAPS_KEYBOARD_ONLY. As you said i don't have keyboard in central and i use NRF_LOG_INFO to display the static passkey in the peripheral. I can connect to the peripheral via smart phone and i was thinking i can do the same with the pdk as central but instead of entering the passkey via keyboard i use sd_ble_gap_auth_key_reply() function to pass the static passkey. I am wondering if there is any othe solution to do that whit static passkey in central side without having any keyboard?

RE: nrf52840 pdk multirole

Hung Bui — Wed, 28 Mar 2018 13:27:26 GMT

How do you configure the central and peripheral regarding the IO capability ? I mean which device you configured to be keyboard and which one was display ?

I suspect that you don't have IO capability so MITM is not possible. That's why you have "Collector did not use MITM" and get disconnection.

Note that when you do static passkey with BLE_GAP_OPT_PASSKEY, you only set it up on one peer as the display. The other peer should be configured as keyboard, with no static passkey.

I would suggest you to test with the ble_app_gls example, we use passkey in this example.

RE: nrf52840 pdk multirole

nahro — Wed, 28 Mar 2018 11:48:51 GMT

Hi Hung,

Now I tested with single connection and I get Collector did not use MITM from the peripheral side(i have MITM in both) and disconnecting, and on the central side i get Disconnected with error 13. it never reachs BLE_GAP_EVT_AUTH_KEY_REQUEST in central device to send the passkey with the sd_ble_gap_auth_key_reply().

I added if statement in pm_evt_handler in central program(i have the same if statement in peripheral program that is why i get Collector did not use MITM) to check if the peripheral have the MITM, i get the same error (did not use MITM) which means both sides did not authenticated with MITM while i enabled MITM in peer_manager_init in both sides!!

I get MITM authentication while i connect to the peripheral device with smart phone without any problems.

RE: nrf52840 pdk multirole

nahro — Thu, 08 Mar 2018 09:11:26 GMT

Hi Hung,

Thank you for your reply. After service dicovery i try to read characteristics from the peripheral thats why i receive rejection. I will test your a single connection and i will use sniffer trace but not today maybe next week.I will get back withe test results a soon as i have a time.

RE: nrf52840 pdk multirole

Hung Bui — Thu, 08 Mar 2018 08:40:53 GMT

Hi Nahro,

Please try to test with a single connection first. Just to make sure the problem was not because you have multiple roles and for some reasons the peer manager messed up.

Secondly, doing service discovery shouldn't cause any issue with encryption level. You only receive rejection from the peer when you try to do a read/write that require the connection to be encrypted by MITM.

Also the peer shouldn't disconnect because the link was not encrypted at correct level. Unless it's how the application designed.

Using sd_ble_gap_auth_key_reply() to tell the softdevice what the passkey is (when the peer device display it) is the correct way.

I would suggest you to get a sniffer trace to see what exactly happens over the air.