Bonding connection on one side

RE: Bonding connection on one side

Ars Morozov — Thu, 10 Jan 2019 07:33:13 GMT

Ok, thanks, I will test it

RE: Bonding connection on one side

Hung Bui — Wed, 09 Jan 2019 16:19:40 GMT

If you have a nRF52832 DK you can use it as a sniffer. If you have a nRF52832 custom board and you can connect the same UART pins to PC you can also use it as the sniffer. It would be very useful to have the sniffer trace.

I attached here a firmware of the proximity app with pairing and no bonding, please test on your device. Please note that you need to erase the chip completely before you test, otherwise if you have bond information on the device, the device will try to re-bond to the phone.

You need to flash softdevice S132 v6.1.0

devzone.nordicsemi.com/.../ble_5F00_app_5F00_prox_5F00_pair_5F00_nobond.hex

RE: Bonding connection on one side

Ars Morozov — Wed, 09 Jan 2019 13:09:14 GMT

[quote userid="2121" url="~/f/nordic-q-a/42173/bonding-connection-on-one-side/164712"]I would suggest to capture a sniffer trace to see what actually happens over the air. [/quote]

I'ven't got a sniffer trace.

[quote userid="2121" url="~/f/nordic-q-a/42173/bonding-connection-on-one-side/164712"]When you reconnect to the phone, do you see the phone re-pair to the device or it can actually re-use the bond information ? [/quote]

It actually re-use the bond information, because if before disconnection I've subscibed on some characteristics, when I reconnected, smartphone think that it still subscribed.

[quote userid="2121" url="~/f/nordic-q-a/42173/bonding-connection-on-one-side/164712"]To enable service changed characteristic you can set NRF_SDH_BLE_SERVICE_CHANGED = 1 and PM_SERVICE_CHANGED_ENABLED = 1 in sdk_config.h[/quote]

Yes, it was established.

RE: Bonding connection on one side

Hung Bui — Wed, 09 Jan 2019 12:57:58 GMT

I would suggest to capture a sniffer trace to see what actually happens over the air.

When you reconnect to the phone, do you see the phone re-pair to the device or it can actually re-use the bond information ?

To enable service changed characteristic you can set NRF_SDH_BLE_SERVICE_CHANGED = 1 and PM_SERVICE_CHANGED_ENABLED = 1 in sdk_config.h

RE: Bonding connection on one side

Ars Morozov — Wed, 09 Jan 2019 05:57:57 GMT

Hi Hung, thanks for reply.

[quote userid="2121" url="~/f/nordic-q-a/42173/bonding-connection-on-one-side/164263"]I assume you set SEC_PARAM_BOND = 0 in your configuration ? [/quote]

Yes.

[quote userid="2121" url="~/f/nordic-q-a/42173/bonding-connection-on-one-side/164263"]What did you mean by " device not bonded smartphone (as it should be)" ? So you want to bond to the smart phone or not ? [/quote]

I mean that device not bonded connection with smartphone and I expected this, but smartphone bonded this connection. So I don't want bondong to smartphone.

[quote userid="2121" url="~/f/nordic-q-a/42173/bonding-connection-on-one-side/164263"]I assume you want the link to be encrypted (pairing) but no bonding (each peer forgets the other after disconnection) [/quote]

Yes, exactly.

[quote userid="2121" url="~/f/nordic-q-a/42173/bonding-connection-on-one-side/164263"]How did you check that the phone bonded to the device ? [/quote]

I see my nRF52832 in rembered devices and also I see "BONDED" string in nRF Connect.

[quote userid="2121" url="~/f/nordic-q-a/42173/bonding-connection-on-one-side/164263"]Which phone did you use to test with ?[/quote]

I use Xiaomi Redmi 6 and Samsung J4.

[quote userid="2121" url="~/f/nordic-q-a/42173/bonding-connection-on-one-side/164263"]Also please make sure you have service changed characteristic in your attribute table, to avoid any caching of the table. [/quote]

Hm..how can I check it?

RE: Bonding connection on one side

Hung Bui — Mon, 07 Jan 2019 13:11:03 GMT

Hi Arsenii,

I assume you set SEC_PARAM_BOND = 0 in your configuration ?

What did you mean by " device not bonded smartphone (as it should be)" ? So you want to bond to the smart phone or not ?

I assume you want the link to be encrypted (pairing) but no bonding (each peer forgets the other after disconnection)

How did you check that the phone bonded to the device ?

Which phone did you use to test with ? Also please make sure you have service changed characteristic in your attribute table, to avoid any caching of the table.