编解码流水线
原始 Payload → LingdianDeviceMessage → 规则 / OTA / 落库 · 下行 Encode
Downlink：Go 编码 → module → gmqtt d
Raw Payload
设备原文
Transport
MQTT · GZIP?
Parse
m/p · method
Auth / Norm
验签 · 归一化
Lingdian
DeviceMessage
标准信封
Post-process
规则 · OTA · 双轨落库
事件推送
Uplink: Raw → Transport → Parse → Auth/Norm → StdEnvelope → Rule/OTA/Store
Downlink：Go 编码 → 选 module → 标准下行帧 → gmqtt → Device
Lingdian AIoT · Codec Pipeline