RE: Does nRF Connect app require a handshake from a device when scanning?

nikolrobottesla — Fri, 08 Sep 2017 20:43:56 GMT

Sorry I don't know the correct terminology. As far as the link between the result and conclusion we think the receiver in the nRF radio is getting desensitized by the 2.3GHz noise. Which means it can't receive the SCAN_REQ and won't send the SCAN_RSP. Also I did mention Android! :)

RE: Does nRF Connect app require a handshake from a device when scanning?

endnode — Fri, 08 Sep 2017 17:40:04 GMT

Firstly hard to say what do you mean by "handshake" (there are only connection, bonding and pairing procedures defined by BT SIG specification) but both Android and iOS (you haven't specified which one you use!) don't need any of them to show you BLE Peripheral/Broadcaster device if it's available for passive/active scanning. However what you are doing are not standard conditions of operation so if you flood the spectrum with noise or colliding packets then only Gods know what all can happen to buggy BLE stacks in Android phones or other devices...

(btw. I also don't see any link between your test result and conclusion that something called handshake is needed. You seems to be mixing connection - Link Layer PDUs exchanged between two devices in intervals called Connection interval - and broadcasting/scanning phase - where only one device is advertising/broadcasting to all or specific listeners).