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I worked with BLE Meshing in industry products. With a lot of hops and a bit of traffic it becomes very unreliable quickly.

Introducing something like TCP o top most likely will kill it because of the network load over a very thin and unreliable connections just causes more mess.

Addendum: this "experience" is a few years old. Maybe newer BLE revisions improved this.

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Have you experimented with Meshtastic and Reticulum?

Not sure if a different comm stack other than bluetooth or WiFi would help.

I work with raw LoRa a lot and it works great.

Reticulum is pretty much a one-man-show that got a lot of press. Never saw a real network with that thing.

Meshtastic is great for communication with up to two hops. But it can become very unreliable if people use configuring wrong roles like Router/etc. in wrong position.

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