#qi-hardware IRC log for Sunday, 2017-01-29

DocScrutinizer05basically the idea resp point of NFC is to sort-of 'replace' pairing like in BT by mere physical proximity. Augmented concepts involve e.g. shaking both devices (stacked) with one (same) hand in sync, creating a "shared secret" from acceleration02:45
DocScrutinizer05I personally rather would have specified the mechanical interaction/linking between both devices as "knock one device with the other several times" - using timestamps and impact pulse shape this would allow shared secret without the need to hand your device to somebody else02:49
DocScrutinizer05additionally one device could playback an audio (good old FSK-2400Hz code, or sth like that) the very moment both devices touch/impact, the other device can record this via mic and play the response on next impact02:52
DocScrutinizer05when device receives a NFC signal trying to "pair" without subsequent "device-kiss" within a - say - 5s, it can yell an alarm for suspected intrusion attempt02:55
wpwrakyeah, three knocks is probably all you really need. but hey, then those nfc chips would be useless again :)03:06
DocScrutinizer05nah, you still need NFC to communicate between the two devices03:07
wpwrakyou could use BT for that, too03:14
DocScrutinizer05afaik BT doesn't work in any 'open mode' (without pairing)04:12
DocScrutinizer05so the missing features of NFC are the negative features of BT - funny, isn't it? ;-)04:13
DocScrutinizer05also perfectly explains why e.g. Nokia uses NFC for BT pairing04:14
DocScrutinizer05with BT you have an additional problem to select the right peer to pair to, when there are more than one other BT devices visible04:54
DocScrutinizer05so even when you do the rather nonsensical "0000" pairing secret key stunt like nowadays many BT devices do, you still need to select *which* device to pair to04:56
wpwrakyou could just try all you can reach05:07
wpwrakmuch like NFC does :)05:08
--- Mon Jan 30 201700:00

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