logo
down
shadow

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 :


Share : facebook icon twitter icon
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.
Related Posts Related Posts :
  • Artefact in shader for iOS
  • Make async request in table view delegate method
  • (iOS) Escaping single quote in XML
  • Change the UIButton Image when tapped multiple times
  • Convert string JSON response to a boolean using Swift 4 Decodable
  • [iOS]renew push certificate but don't have certificateSigningRequest file
  • How to change src value in UIWebView?
  • Inserting into Array and comparing Dates Swift iOS Code
  • IBDesignable UI is not showing in Xcode 9 with Swift
  • Ask for only Request Always Authorization, and not When-In-Use Authorization
  • "Google/Analytics.h file not found" after updating pod to GoogleAnalytics
  • Post request with HTTP header parameters
  • Managing cookies for a domain in Associated Domains
  • Array items showing error in IOS
  • Saving asynchronously downloaded files' contents to SQLITE
  • Swift 4 - animating both alpha and constraint affects other components alpha value
  • UIView animation in completion block starts with displacement
  • List all Apps and Track Internet Usage
  • Handling Back To Back HTTP Posts SWIFT 4.0
  • Azure App Service Push - registration endpoint
  • Select multiple item in a tableView
  • Apartment number / Unit number returned from google places api
  • How to align UICollectionViewCells from left to right?
  • How can I add search option on UIPickerview in ios?
  • Scenekit - physicsWorld setup to prevent kinematic nodes to intersect
  • Carthage Build Failed
  • swift 3, ios 10 - push notification firebase is not received
  • App Xcode 8 to Xcode 9 - Prevent Auto Hide Status Bar
  • How to pop back to a TableViewController?
  • Is UserDefaults thread safe in Swift? How to check it?
  • UISwitch in a table selects multiple cells when switch state on
  • iOS App with no story board (Size classes and Device type limitations)
  • AudioKit issue, mic not sensitive enough
  • send indexpath to Firebase (like button)
  • UIColor saturation brightness values different from the regular saturation luminosity values of a color
  • JSON: Extracting Data Using Alamofire and Swift 3
  • invalid_grant on OAuth2 request when obtaining access_token from SSO in App
  • ABNewPersonViewController using contact framework
  • Design iOS button scalable
  • Subclassing NSLayoutConstraint constant based on screen height
  • Migrate Realm 2.x List of Object to Realm 3.x List of String (or other primary type)
  • Backgroundcolor of NSTextfield
  • Firebase modifying uid in every view
  • How to rotate orientation?
  • Upload a new version of ios app to app store?
  • UIScrollView do not scroll down to its original position when keyboard disappear
  • What is the most effective way of tracking time/dates in an iOS/Swift application?
  • WatchKit get user's preferred handedness
  • Location permission dialog is shown and immediately disappears
  • Combine these regex expressions
  • How to save an array of HKQuantitySamples (heart rate) to a workout
  • RestKit mapping with parent key as attribute and key contains parenthesis
  • How to add UITextField programmatically to UIScrollView without breaking constraints?
  • How to make a view height grow depending on its child views contents
  • Some users experiencing NSInternalInconsistencyException crash
  • Mark successful siesta response as error
  • Using a modified PDFTron Tools Framework
  • How can I use universal links when I call openURL inside my own app?
  • NSArray of doubles iOS (Objective c)
  • Passing data from embedded PageViewController to parent View Controller
  • shadow
    Privacy Policy - Terms - Contact Us © voile276.org