What exactly is txPower for Bluetooth LE and how is it used?

Question

I am trying to understand what exactly txPower is and how to use it, since I am planning to develop and Android app that uses Beacons.

I have seen 2 definitions onl

Answer 1

Check that issue maybe it helps: Get Tx Power of BLE Beacon in Android also you could check out some devBytes from Google about BLE https://www.youtube.com/watch?v=vUbFB1Qypg8

If you are using specific BLE beacons you need to referenced the datasheet and check how tx power is measured. As you already mentioned there is different definitions for it. During my dev I found that most suitable is that : txPower is measured in some distance from transmitter with way without obstacles. So if there is a wall for example txpower will be lower. Consider that.