Post ADDCcdFk7mBibfLRia by ultimape@mastodon.social
 (DIR) More posts by ultimape@mastodon.social
 (DIR) Post #ADDCcclFx7nl5756CO by ultimape@mastodon.social
       2018-01-06T09:41:15Z
       
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       I spent time exploring what it would take to recreate google's 'nearby' and indirectly discovered a really interesting stack for building decentralized p2p adhoc meshnets.Video on 'nearby': https://youtu.be/Acdu2ZdBaZEhttps://github.com/quiet"ultrasonic modem"https://github.com/AltBeaconbluetooth beaconshttps://github.com/servalprojectwifi meshnetShifts an oppressive user hostile tech behind ultrasonic tracking into something liberating?Fuck. Yeah.context:https://mastodon.social/@ultimape/99302138746316346
       
 (DIR) Post #ADDCcdFk7mBibfLRia by ultimape@mastodon.social
       2018-01-06T10:19:37Z
       
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       As an aside, packet radio is really weird. Here's a presentation by a guy who's thesis is trying to fully document and reverse engineer the entire bell202 spec being used in the field. A technology stack that has literally been around since before he was born.https://youtu.be/opmYMAgpKeA?t=6m44sI can only vaguely grasp what is going on here with my experience in electronics, networking and signal theory from college, but sure is interesting.
       
 (DIR) Post #ADDCcdkEIQZg8DbnEm by ultimape@mastodon.social
       2018-01-06T10:25:05Z
       
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       Watching the I/O presentation on 'nearby' It seems they encode the signal inside of a noisy pattern. Off the cuff it looks like an attempt to avoid odd bounces, but also reminded me of how bats use frequency in echolocation to focus the sound beam, but doing it in reverse to ensure a wider sweep? (ref: http://rspb.royalsocietypublishing.org/content/276/1658/853). I think this is also used in sonar systems.A college friend suggested it might be a form of https://en.wikipedia.org/wiki/Frequency-hopping_spread_spectrum used in 802.11g to avoid reflections and stuff.
       
 (DIR) Post #ADDCceF4RlFDfs2QJE by ultimape@mastodon.social
       2018-01-06T10:36:13Z
       
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       For background and history on the concept of sending data, first check out this stackoverflow question/answer set, which includes a great diagram on what it looks like to 'call' another computer https://electronics.stackexchange.com/questions/68790/how-does-a-signal-travel-down-a-telephone-wireAnd then take a look at how they ran telephone wires, set up microwave towers to handle longer distance, and eventually an entire world wide network http://www.telcomhistory.org/vm/scienceLongDistance.shtmlThen try this exploration of how it shifted to telephone-over-internet (+beyond?)https://medium.com/@aantonop/why-dumb-networks-are-better-f0b94c271b76
       
 (DIR) Post #ADDCceoALHJjQiSS0m by ultimape@mastodon.social
       2021-11-08T15:45:25Z
       
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       "Beaconization—or equipping bicycles and pedestrians with transponder beacons that can be spotted automatically by sensor-equipped cars—has been given the official seal of approval in the U.S., reveals a tucked away part of the $1.2 trillion bipartisan infrastructure bill passed by the House of Representatives on November 5."https://www.forbes.com/sites/carltonreid/2021/11/06/bidens-12-trillion-infrastructure-bill-hastens-beacon-wearing-for-bicyclists-and-pedestrians-to-enable-detection-by-connected-cars/You will be tracked, or you risk getting hit by self driving death machines. It will be your fault.