Do smart phones support "LE Long Range (Coded PHY, S=8)" Perplexity says it can transmit up to a 1km in ideal conditions. Otherwise it's 10-30m indoor.
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First responders have awesome tools. But in tough situations, even common folks need to help.
After what happened in Myanmar, we need something like this that works properly.
It has only been tested in controlled environments. It can also be improved; I know BLE is not _that_ effective under rubble.
If you have any feedback or can contribute, don't hold back.
Ideal conditions is likely open spaces with no interference. Walls and concrete lower that as you mentioned.
I'm hoping it can help if people are standing right next to the rubble, whether BLE or the "siren" sound.
I have no guarantees though. I haven't properly tested because I haven't thought of a low cost option yet.