HK protesters use “unblockable” messaging via a bluetooth mesh

Re:HK protesters use “unblockable” messaging via a bluetooth... by loeg on Saturday September 07, 2019 @06:21PM (#20906992)

It does not hop outside of the defined unlicensed[1] 2.40-2.48 GHz band. If you can block that whole band, BT doesn't work.

[1]: In the US; it's complicated. Tl;dr is http://afar.net/tutorials/fcc-rules/ , much much more verbose is https://www.ecfr.gov/cgi-bin/retrieveECFR?mc=true&r=PART&n=p...

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Re:HK protesters use “unblockable” messaging via a bluetooth... by zoom6628 on Saturday September 07, 2019 @07:59PM (#20907544)

2.4GHz band is the GSM band here in HK so would be major disruption of general communications which is why they cant do it. Yes GSM runs on other bands like 1900 but majority of phones in Asia use GSM as backbone, and LTE over this freq, so unadvisable to block that freq. What could be done is to flood the mesh from myriad devices running the same app or derivative.

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Re:HK protesters use “unblockable” messaging via a bluetooth... by elmicha on Sunday September 08, 2019 @01:03AM (#20908716)

I can't find 2.4GHz as a GSM band: https://www.spectrummonitoring.com/frequencies/frequencies3...., https://m.gsmarena.com/network-bands.php3?sCountry=HONG+KONG, https://www.frequencycheck.com/countries/hong-kong

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