Zephyr BLE GATT Server 注册到收发调用链源码解析（NCS v3.2.1）数据来源说明：本文基于 Zephyr BLE 协议栈 Host 开源部分（subsys/bluetooth/host/gatt.c、att.c、include/zephyr/bluetooth/gatt.h）撰写。GATT/ATT 均为 Host 开源代码，可对照源码阅读。文中行号依据 NCS v3.2.1 研究文档标注，因本机联网限流（raw.githubusercontent.com 返回 429）未对每一行独立联网核对，以实际源码为准。SoftDevice Controller 部分闭源，本文不涉及