Listing 1. Function used to calculate the RSSI accuracy.
1	/*
2	* Calculates the accuracy of RSSI value considering txPower
3	* https://developer.radiusnetworks.com/2014/12/04/fundamentals-
4	* beacon-ranging.html
5	*/
6	protected static double calculateRating(int txPower, double rssi) {
7	if (rssi == 0) {
8	return -1.0; // if we cannot determine accuracy, return -1.
9	}
10
11	double ratio = rssi*1.0/txPower;
12	if (ratio < 1.0) {
13	return Math.pow(ratio,10);
14	}
15	else
16	return (0.89976)*Math.pow(ratio,7.7095) + 0.111;
17	}