问题：bluetooth low energy ble beacons
答案：
Bluetooth Low Energy (BLE) beacons are small, battery-powered wireless transmitters that periodically broadcast short data packets using the BLE protocol. They operate in the 2.4 GHz ISM band and are designed for low-power, short-range communication. Beacons typically use a standardized advertising format (such as iBeacon, Eddystone, or AltBeacon) to transmit identifiers, which nearby devices (e.g., smartphones) can detect to trigger location-based actions, proximity notifications, or indoor navigation. The key characteristics include very low energy consumption (allowing years of operation on a coin cell battery), support for one-way broadcasting (no pairing required), and a typical range of up to 100 meters (depending on environment and transmit power).
（注：以上内容基于蓝牙技术通用知识，参考资料中未直接定义BLE beacon，但Silicon Labs和ESP32文档均涉及BLE低功耗特性与SoC支持，可作为技术背景补充。）
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