Ask: Direct sending and receiving data trought WiFi

8 points by swiatlo 1y ago ↗ HN

It takes a long time to connect to the server. I would like to be able to send data packets directly without connecting to the wifi server. I would create a mesh wifi. (similar https://reticulum.network/, tox https://github.com/TokTok/c-toxcore etc) I would like in root/administrator mode to send and receive packets directly. How to do this in linux? How to send a message when the wifi devices only pass each other for a few or a few tens of seconds for example.

14 comments

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SvenL 1y ago ↗

There was a standard called Wi-Fi Direct for such a use case. I remember evaluating it for a automotive project (where cars would pass object only for a short time). Maybe it’s fits your use case.

https://en.m.wikipedia.org/wiki/Wi-Fi_Direct

swiatlo 1y ago ↗

wifi direct have transmiter and receiver too ;) In my opinion sending message like walkie-talkie radio protocol is different. (for example https://github.com/ntoivola/uvk5-chirp-driver-nunu )

[dead] styczen 1y ago ↗

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beardyw 1y ago ↗

Sounds more like bluetooth.

oni0010 1y ago ↗

bluetooth have 10m distance, wifi 100m or km if You have good antena in mesh network this is important.

BTW bT still need negotiation time.

styczen 1y ago ↗

https://www.youtube.com/watch?v=yCLb2eItDyE 10km in wifi, usualy 100m not 10m

beardyw 1y ago ↗

> How to send a message when the wifi devices only pass each other for a few or a few tens of seconds for example.

I took that to mean pretty close.

[dead] uuu11 1y ago ↗

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brudgers 1y ago ↗

RFID has some of the significant properties you are looking for. I don't know if it has all of them because I've just about exhausted all my knowledge of RFID and don't know any details of the actual problem you are trying to solve. But RFID is deployed at scale and "everywhere." Probably because the technology doesn't depend on protocols developed for other uses (e.g. IP). Good luck.

styczen 1y ago ↗

RFID have small distance yes BT and RFID is ok but wifi im more popular and long working distance

chatmasta 1y ago ↗

Do you want to be able to continue to use your WiFi device(s) for their normal behavior in the meantime? i.e. is it acceptable if you need to disconnect from WiFi before initiating a p2p transfer?

[dead] nsjoz 1y ago ↗

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solardev 1y ago ↗

I think there is a defined wifi mesh standard, 802.11s https://en.wikipedia.org/wiki/IEEE_802.11s

I think it was used by the deployed OLPC (One Laptop Per Child) project back in the 90s/early 2000s, which wanted to send them to areas with no internet.

If you can get such a network set up, you should be able to route IP packets over it as normal?

I think during the Hong Kong protests, they also used peer to peer smartphone meshes over either Wifi or Bluetooth (can't remember). Might be worth looking into?

cpach 1y ago ↗

I don’t understand why this is desirable. May I ask what use-case you’re referring envisioning?