Using BLE RSSI value for connect-by-proximity

Using BLE RSSI value for connect-by-proximity

By : Ingelbert
Date : November 20 2020, 03:01 PM
Hope that helps RSSI is signal strength and signal strength usually correlates with distance. However, the assumption made is all devices are transmitting with the same amount of power. If you're using a variety of devices you may run into issues due to different transmit powers. I guess you need to find out how much difference there is between devices' transmit power and how much that affects RSSI at different distances. There may not be much difference in power since BLE is intended for lower power usage.
Also, I'm pretty sure RSSI changes over distance are not linear. So it may be easier to distinguish between 2 devices at 1ft and 3 ft then 2 devices at 6 ft and 12 ft. I'm not really sure of the details, though, and again that's assume both devices are transmitting at the same power level. If you do some searching you might be able to find the formula used for iBeacon distance calculations based on RSSI.
code :

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Bluetooth LE RSSI for proximity detection iOS

Bluetooth LE RSSI for proximity detection iOS

By : M.Leo
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , The experience of Matthew Griffin matches mine. However - when we can measure for a fair period of time two things have helped us calibrate this better.
We did have to wrap a simple (kalman) filter on the antenna orientation and the IMU to get a rough running commentary though - and this is not very CPU or battery light.
Estimating beacon proximity/distance based on RSSI - Bluetooth LE

Estimating beacon proximity/distance based on RSSI - Bluetooth LE

By : itsTheJaguar
Date : March 29 2020, 07:55 AM
Hope that helps It is unclear whether your inability to read the "txPower" or "measuredPower" calibration constant is due to the AdRecord class or due to the information being missing from the advertisements you are trying to parse. It doesn't look to me like that class will parse a standard iBeacon advertisement. Either way, there is a solution:
SOLUTION 1: If your beacons send a standard iBeacon advertisement that includes the calibration constant, you can parse it out using code in the open source Android iBeacon Library's IBeacon class here.
code :
HashMap<String,Integer> txPowerLookupTable = new HashMap<String,Integer>();
txPowerLookupTable.put("a5:09:37:78:c3:22", new Integer(-65));
txPowerLookupTable.put("d2:32:33:5c:87:09", new Integer(-78));
String macAddress = device.getAddress();
Integer txPower = txPowerLookupTable.get(macAddress);
Did iOS 7.1 break 4S iBeacon support? Proximity is always CLProximityUnknown on 4S and RSSI is always zero. Please help,

Did iOS 7.1 break 4S iBeacon support? Proximity is always CLProximityUnknown on 4S and RSSI is always zero. Please help,

By : luvzlabz
Date : March 29 2020, 07:55 AM
Hope this helps CoreLocation still works in 7.1 on the iPhone 4S. See my detailed test results here, which were done on a 4S. So this is most likely an issue with your test setup, either the phone, the beacon or a combination of both.
First, do a reboot to see if the problem still persists as @gokhan-karaca suggests. Then try another iBeacon (what kind are you using now?), ideally an iOS-based one if you have a second device to test with. It may be that a software filter on the RSSI is rejecting the value measured by the bluetooth chip for some reason.
Beacon found but RSSI is 0, Accuracy -1 and Proximity unknown

Beacon found but RSSI is 0, Accuracy -1 and Proximity unknown

By : Chris
Date : March 29 2020, 07:55 AM
help you fix your problem This typically happens when the power calibration constant is incorrectly set in the beacon. This constant should be set to the measured RSSI at one meter. A typical value is -59. You may wish to see if you can configure this value in the Gimbal admin console.
It is also possible that the battery is low in the beacon and the signal is very weak. Replacing the battery may resolve the issue.
Bluetooth device proximity using RSSI

Bluetooth device proximity using RSSI

By : Tebbutt
Date : March 29 2020, 07:55 AM
will help you What you should really do is use the Android Beacon Library, it will work the distance out for you.
The actual calculation is very complex and this Library has been used by a lot of people since Radius Networks created it. The link is for the website downloads, but you can use gradle too.
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