nrf52 "pairing took too long" with iPad - HID keyboard device

RE: nrf52 "pairing took too long" with iPad - HID keyboard device

run_ar — Tue, 29 May 2018 10:53:29 GMT

Does this happen all the time with a "failing"device? Have you tried restarting the iOS device? Which iOS devices work and which does not? Are you able to recreate this with any of the SDK examples? I did some testing with the HID example, but iOS reconnects automatically.

RE: nrf52 "pairing took too long" with iPad - HID keyboard device

MattFL — Fri, 25 May 2018 14:07:28 GMT

I did nothing to the device on iOS and it remains in the device list. The only option in iOS is to "forget" the Nordic device. If I "forget" the device in iOS then I need to re-pair the two. If I do nothing in iOS and power-off the Nordic, then clearing the bonds on the Nordic when it powers up allows them to reconnect right away. If I don't clear the bonds on the Nordic device then the two don't reconnect reliably. Unfortunately all of my Nordic devices have now been sent to my customer for proof of concept testing, depending on how that goes I will hopefully have some more devices here that I can work with. Once they are connected they seem to work fine, it's just the connecting part that needs some work.

RE: nrf52 "pairing took too long" with iPad - HID keyboard device

run_ar — Fri, 25 May 2018 13:06:30 GMT

[quote user=""]What is actually happening is the Nordic device will not re-connect to iOS unless the bonds are cleared. If the bonds are cleared, iOS reconnects almost instantly. But without clearing the bonds, iOS won't reconnect reliably.[/quote]

Do you also clear the bond from the iOS device? Do you find your device in the iOS bluetooth device list?

RE: nrf52 "pairing took too long" with iPad - HID keyboard device

MattFL — Thu, 24 May 2018 17:23:29 GMT

Thank you for the reply. The pairing code is directly from your app_hids_keyboard example without changes. I don't have a sniffer at the moment, I will try to convince my boss will spring for a nRF51 dongle so I can use your sniffer software. In the meantime any tips you could provide would be great.

RE: nrf52 "pairing took too long" with iPad - HID keyboard device

run_ar — Thu, 24 May 2018 10:18:08 GMT

My initial thought is there could be a mismatch between advertsiment address and the actual address in case directed advertising is used. Or that there could be a whitelist that is missing the irk for the iOS device. Do you have a sniffer trace that shows the first succesfull bond and later on the failed reconnect?