ibeacon distance calculate
protected static double calculateAccuracy(int txPower, double rssi) {
if (rssi == 0) { return -1.0; //
if we cannot determine accuracy, return -1. }
double ratio = rssi*1.0/txPower;
if (ratio < 1.0) { return Math.pow(ratio,10);
} else { double accuracy = (0.89976)*Math.pow(ratio,7.7095) + 0.111;
return accuracy; }
}
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