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joelkoen avatar joelkoen commented on August 25, 2024 1

Not 100% sure, but I think microG can source location data from certain hotspots like on planes. Certain planes offer HTTP APIs that allow you to get location information.

https://github.com/microg/GmsCore/blob/991da7bdd172add5eb664a4d713ca53513d5d5f3/play-services-location/core/provider/src/main/kotlin/org/microg/gms/location/network/wifi/MovingWifiHelper.kt#L314C1-L314C70

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mar-v-in avatar mar-v-in commented on August 25, 2024

Yes. This works in the WiFi of some buses, trains and planes. Whenever I can get access to such a system I will try to add it to the list of supported WiFis.

For those WiFis we can't use traditional WiFi-based positioning as the WiFi location is non static. We thus remove these WiFi from the usual location logic and if possible and enabled try to retrieve location from the API of the WiFi itself.

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ale5000-git avatar ale5000-git commented on August 25, 2024

@mar-v-in
Is it possible to also add support to get location using "Wi-Fi location: ranging with RTT"? https://developer.android.com/develop/connectivity/wifi/wifi-rtt?hl=en
This allow to get accurate location indoor.

Note: The requesting device doesn't need to connect to the access points to measure distance with Wi-Fi RTT

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mar-v-in avatar mar-v-in commented on August 25, 2024

I'd love to, but there is only a small number if business WiFi AP that support it (at least last time I checked) and I don't know anyone with a device I could use for testing. Also I don't know how useful it will be in practice.

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ale5000-git avatar ale5000-git commented on August 25, 2024

For example: With this accuracy, you can develop fine-grained location-based services, such as indoor navigation, disambiguated voice control (for example, "Turn on this light"), and location-based information (for example, "Are there special offers for this product?").
Also in shopping centers apps that use augmented reality will need precise location.

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ale5000-git avatar ale5000-git commented on August 25, 2024

I have FRITZ!Box 7530 + FRITZ!Repeater 3000, I'm not sure how to check if it is supported, do you know?

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mar-v-in avatar mar-v-in commented on August 25, 2024

If there's no setting in your router admin interface to enable it or configure its Geo coordinates, it's likely not supported. The reason why most AP won't support it is that you need at least 2 AP to be able to locate properly and most consumer devices don't target that setup.

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ale5000-git avatar ale5000-git commented on August 25, 2024

I don't see the option but FRITZ!Repeater 3000 contains three wireless radio units alone + the ones inside FRITZ!Box 7530.

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mar-v-in avatar mar-v-in commented on August 25, 2024

Google has published this list: https://developer.android.com/develop/connectivity/wifi/wifi-rtt#supported-aps
It's probably incomplete, but still shows it's rarely supported. This is specifically for AP that support FTM (to measure distance) and LCI/LCR data (to announce own geocoordinates). There are more AP that support FTM without announcing it, but I don't think that will help us a lot here.

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ale5000-git avatar ale5000-git commented on August 25, 2024

If in the future I will get something that support it I will contact you.
In the meantime I hope that there will be other people that already have one of these devices and want to help.

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ale5000-git avatar ale5000-git commented on August 25, 2024

@mar-v-in
Instead of just guessing, is there an app for Android that list nearby devices and detect directly if they support it or not?

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Sapiosenses avatar Sapiosenses commented on August 25, 2024

If in the future I will get something that support it I will contact you.
In the meantime I hope that there will be other people that already have one of these devices and want to help.

I found some links for you below, including some not crazy expensive supporting H/W.

Personally I think given this protocol has been around for ~6 years now and you hardly ever hear about it, I don't think it's exactly taking the world by storm. To me the best use-case would seem to be things like robotic factories and warehouses.

The people talking about retail usage where they track everyone walking around a store, or corpos tracking employees around the office etc creeps me out tbh. It's bad enough with BT beacons.

https://people.csail.mit.edu/bkph/WifiRttScanX

https://www.netspotapp.com/blog/wifi-standards/what-is-wifi-rtt.html

https://medium.com/@darryncampbell_83863/indoor-positioning-with-wifi-rtt-and-google-wifi-a638f1147b84

https://www.inpixon.com/technology/standards/wifi

https://www.cnx-software.com/2018/09/05/compulab-wild-wifi-rtt-router-802-11mc/

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