Distance from phone app request

[espruino-discuss2]

Posted at 2022-12-12 by user151646

Hi l was wondering if anyone has thought of making an app to Bluetooth between your phone and watch so phone beeps/ vibrates when around 0.5 mt apart or so.
When you're out great to have peace of mind that you don't leave phone by mistake.
I cannot program ( the brain doesn't work that well anymore). but feel this would be a great app to have with the bangle.
Peace love and mung beans.

[espruino-discuss2]

Posted at 2022-12-12 by rigrig

Actual distance would be tricky, a simpler option might be to make the watch alert you when the Bluetooth connection is lost. Not sure how long it takes for the watch to notice that if not sending anything though?

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Posted at 2022-12-12 by Hank

https://banglejs.com/apps/?id=widbt_notify does this pretty good. It can be set to buzz when connection is lost. So when I leave the house without the phone, I get notified.

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Posted at 2022-12-12 by user151646

Thank you that's what I meant to say. Just loosing connection.

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Posted at 2022-12-12 by user151646

Hi thanks for the information. I tried the app and it worked but was too far a distance. I was hoping that I could get it within about 0.5 mts so you have time to get back to your phone if you left it on a table or bench.

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Posted at 2022-12-12 by @thyttan

I wondered if using BLE signal strength could be used to approximate distance, but:

Conclusion
We see that Bluetooth presents enormous challenges for inferring distance.

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Posted at 2022-12-12 by @halemmerich

Since in this case only the specific combination of one Bangle and one Smartphone is relevant, maybe a configurable RSSI value as threshold is good enough? I think at least leaving the room should be clearly distinguishable in the RSSI values and would be better than complete connection loss as the only indicator. Can we get the RSSI of the connection to the Phone, maybe using this https://www.espruino.com/Reference#t_l_NRF_setRSSIHandler?

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Posted at 2022-12-13 by user151646

RSSI values
With my very limited understanding of programming and reading up what you mentioned , that makes sense. So if the value / strength of the connection drops due to distance, it would trigger the vibration mode without actually disconnecting the connection.
Is there someone who could turn this into a small basic app please.?
TIA