It's a simple rather heuristic approach. Because BLE uses randomised MAC and the OSSID are not stable, nor the UUID of the service announcements, you can't just scan for the bluetooth beacons. And, to make thinks even more dire, some like Meta, for instance, use proprietary Bluetooth services and UUIDs are not persistent, we can only rely on the communicated device names for now.
场面一度有点像在挂号看医生，每个家长都希望这位红娘能替自家孩子把婚事“看”好。。业内人士推荐一键获取谷歌浏览器下载作为进阶阅读
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RSSI is short for Received Signal Strength Indication. The value is an indication for the reception field strength of wireless communication applications. Wikipedia has a quite good article about it.。im钱包官方下载对此有专业解读