{"id":5616,"date":"2020-09-17T10:49:05","date_gmt":"2020-09-17T10:49:05","guid":{"rendered":"https:\/\/www.beaconzone.co.uk\/blog\/?p=5616"},"modified":"2021-01-08T10:20:37","modified_gmt":"2021-01-08T10:20:37","slug":"social-distancing-rssi-calibration","status":"publish","type":"post","link":"https:\/\/www.beaconzone.co.uk\/blog\/social-distancing-rssi-calibration\/","title":{"rendered":"Social Distancing Bluetooth RSSI Calibration"},"content":{"rendered":"\n<p>We previously described <a href=\"https:\/\/www.beaconzone.co.uk\/blog\/how-social-distancing-wearables-work\/\">how social distance beacons differ from ordinary beacons<\/a>. Devices advertise <strong>AND<\/strong> scan rather than just advertise <strong>OR<\/strong> scan. The principle is the same with with smartphones using the <a rel=\"noreferrer noopener\" href=\"https:\/\/developers.google.com\/android\/exposure-notifications\/exposure-notifications-api\" target=\"_blank\">Apple\/Google Exposure Notification API<\/a>.<\/p>\n\n\n\n<p>The problem with smartphones is that their transmit and receive capabilities vary widely. The received signal strength (RSSI) is inconsistent across types of smartphone and you can&#8217;t determine distance reliably. Apple and Google have mitigated this problem by attempting to create a <a href=\"https:\/\/developers.google.com\/android\/exposure-notifications\/files\/en-calibration-2020-08-12.csv\" target=\"_blank\" rel=\"noreferrer noopener\">database of calibration values (csv)<\/a>.<\/p>\n\n\n\n<p>The calibration data is useful for Bluetooth developers creating solutions across devices. However, it&#8217;s of no use for 3rd party contact tracing as only Government agencies can use the Exposure Notification API and <a rel=\"noreferrer noopener\" href=\"https:\/\/developer.apple.com\/news\/?id=03142020a\" target=\"_blank\">Apple is banning Covid related apps<\/a>.<\/p>\n\n\n\n<p>Read about <a href=\"https:\/\/www.beaconzone.co.uk\/SocialDistancingContactTracing\" target=\"_blank\" rel=\"noreferrer noopener\">Beacons for Workplace Social Distancing and Contact Tracing<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>We previously described how social distance beacons differ from ordinary beacons. Devices advertise AND scan rather than just advertise OR scan. The principle is the same with with smartphones using the Apple\/Google Exposure Notification API. The problem with smartphones is that their transmit and receive capabilities vary widely. The received signal strength (RSSI) is inconsistent &hellip; <a href=\"https:\/\/www.beaconzone.co.uk\/blog\/social-distancing-rssi-calibration\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Social Distancing Bluetooth RSSI Calibration&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":5617,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[269,32,270],"tags":[],"_links":{"self":[{"href":"https:\/\/www.beaconzone.co.uk\/blog\/wp-json\/wp\/v2\/posts\/5616"}],"collection":[{"href":"https:\/\/www.beaconzone.co.uk\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.beaconzone.co.uk\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.beaconzone.co.uk\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.beaconzone.co.uk\/blog\/wp-json\/wp\/v2\/comments?post=5616"}],"version-history":[{"count":6,"href":"https:\/\/www.beaconzone.co.uk\/blog\/wp-json\/wp\/v2\/posts\/5616\/revisions"}],"predecessor-version":[{"id":5963,"href":"https:\/\/www.beaconzone.co.uk\/blog\/wp-json\/wp\/v2\/posts\/5616\/revisions\/5963"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.beaconzone.co.uk\/blog\/wp-json\/wp\/v2\/media\/5617"}],"wp:attachment":[{"href":"https:\/\/www.beaconzone.co.uk\/blog\/wp-json\/wp\/v2\/media?parent=5616"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.beaconzone.co.uk\/blog\/wp-json\/wp\/v2\/categories?post=5616"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.beaconzone.co.uk\/blog\/wp-json\/wp\/v2\/tags?post=5616"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}