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IPC预览与对讲

约 5287 字大约 18 分钟

2026-10-16

本页包含已接线核心流程及可选扩展；具体子能力必须按设备、平台与用户授权求交集。参见支持范围、场景索引和命令手册。图中S编号只用于本文定位，不放入实际JSON。

前置条件

已授权观看者主动打开预览；产品配置 admission=direct 或 accept。摄像头隐私、物理遮挡和资源不足均可拒绝；每个观看者拥有独立会话、Peer 和令牌。

图中P代表经鉴权的平台业务控制器和媒体节点，不要求同一进程；A是用户应用，D是设备。控制图描述一种合法顺序，跨通道不承诺严格同序。

完整时序

报文索引

编号按图阅读；编号保留历史引用，不要求数值连续。字段定义以命令链接为准。

编号发送→接收Topic/接口方法及契约应答/等待状态或作用
S07-M01A→PAPP↑interaction.openHTTP受理；随后 interaction.result；10秒平台验证目标、策略和能力后邀请设备；接收 HTTP202 不是接通。
S07-M02P→AAPP↓interaction.result—；不等待经 WS interaction.event 发给原操作者，原 token；设备通知不能充当应用请求应答。
S07-M03P→DSIG↓sessionInvitesessionAccept 或 sessionReject；30秒/到期平台邀请；humanCall 固定 accept；direct 也必须设备确认资源和隐私状态，不能跳过 sessionAccept。
S07-M04D→PSIG↑sessionAcceptrequestAck；10秒沿用邀请 msgToken。邀请答复本身是需确认的请求，等待平台 ACK 后协商媒体。
S07-M05P→DSIG↓requestAck—；不等待原邀请 token；确认接听有效，不携带 SDP、不宣告已接通。
S07-M06D→PSIG↑mediaOffermediaAnswer；15秒设备为自身 Peer 的 offerer；初始与重协商同一方法，只允许一个在途 offer。
S07-M07P→DSIG↓mediaAnswer—；不等待完成 SDP 交换，仍需 ICE/DTLS 连通与 mediaState，不直接 established。
S07-M08D→PSIG↑mediaStaterequestAck；10秒报告设备实际传输状态。WebRTC 需 ICE/DTLS 成功；UDP 需有效会话媒体探测且平台也收到有效包。
S07-M09P→DSIG↓requestAck—；不等待仅确认状态上报；平台须独立验证自身连通状态。
S07-M10A→PAPP↑interaction.mediaOfferHTTP受理；随后 interaction.result；10秒应用 Peer 自己协商；设备完成 SDP 不代替应用 Peer。
S07-M11P→AAPP↓interaction.result—；不等待经 WS interaction.event 发给原操作者，原 token；设备通知不能充当应用请求应答。
S07-M12A→PAPP↑interaction.mediaStateHTTP受理；随后 interaction.result；10秒应用报告 ICE/DTLS 状态；平台需独立校验。
S07-M13P→AAPP↓interaction.result—；不等待经 WS interaction.event 发给原操作者，原 token；设备通知不能充当应用请求应答。
S07-M14P→DSIG↓sessionEstablished—；不等待平台确认所需参与端媒体已连通后通知；不等于已收到首包或扬声器起播。
S07-M15P→DSIG↓trackControl反方向 trackState；10秒publish/stop 控制源轨；subscribe/unsubscribe 仅本参与端订阅；pause/resume 只作用本端发布或订阅，不关闭其他观看者。请求不等于实际生效。
S07-M16D→PSIG↑trackState—；不等待双向实际状态；应答同 token 和 code，主动报告独立 token。设备失联只能标 unknown，不能假报 stopped。
S07-M17A→PAPP↑interaction.openHTTP受理；随后 interaction.result；10秒平台验证目标、策略和能力后邀请设备；接收 HTTP202 不是接通。
S07-M18P→AAPP↓interaction.result—；不等待经 WS interaction.event 发给原操作者，原 token；设备通知不能充当应用请求应答。
S07-M19P→DSIG↓sessionInvitesessionAccept 或 sessionReject；30秒/到期平台邀请；humanCall 固定 accept；direct 也必须设备确认资源和隐私状态，不能跳过 sessionAccept。
S07-M20D→PSIG↑sessionAcceptrequestAck；10秒沿用邀请 msgToken。邀请答复本身是需确认的请求，等待平台 ACK 后协商媒体。
S07-M21P→DSIG↓requestAck—；不等待原邀请 token；确认接听有效，不携带 SDP、不宣告已接通。
S07-M22D→PSIG↑mediaOffermediaAnswer；15秒设备为自身 Peer 的 offerer；初始与重协商同一方法，只允许一个在途 offer。
S07-M23P→DSIG↓mediaAnswer—；不等待完成 SDP 交换，仍需 ICE/DTLS 连通与 mediaState，不直接 established。
S07-M24D→PSIG↑mediaStaterequestAck；10秒报告设备实际传输状态。WebRTC 需 ICE/DTLS 成功；UDP 需有效会话媒体探测且平台也收到有效包。
S07-M25P→DSIG↓requestAck—；不等待仅确认状态上报；平台须独立验证自身连通状态。
S07-M26A→PAPP↑interaction.mediaOfferinteraction.result；10秒此参与者自己的Peer独立协商，不复用别人的连接。
S07-M27P→AAPP↓interaction.result—；不等待仅完成SDP交换，尚未接通。
S07-M28A→PAPP↑interaction.mediaStateinteraction.result；10秒应用实际连通上报，平台还要校验媒体节点状态。
S07-M29P→AAPP↓interaction.result—；不等待确认状态已受理，不等于首帧显示。
S07-M30P→DSIG↓sessionEstablished—；不等待平台确认所需参与端媒体已连通后通知；不等于已收到首包或扬声器起播。
S07-M31A→PAPP↑interaction.endHTTP受理；随后 interaction.result；10秒由参与者结束其有权结束的会话；观看者只退出自己的观看会话，不终止共享源。
S07-M32P→AAPP↓interaction.result—；不等待经 WS interaction.event 发给原操作者，原 token；设备通知不能充当应用请求应答。
S07-M33P→DSIG↓sessionEnded—；不等待主动结束用原 token 和 code；其他结束用独立事件 token 与 eventSeq。ended 是唯一会话终态。
S07-M34A→PAPP↑interaction.subscribeHTTP受理；随后 interaction.result；10秒每个观看者新建独立接收会话及令牌；不能共享其他观看者令牌。
S07-M35P→AAPP↓interaction.result—；不等待经 WS interaction.event 发给原操作者，原 token；设备通知不能充当应用请求应答。
S07-M36A→PAPP↑interaction.mediaOfferinteraction.result；10秒此参与者自己的Peer独立协商，不复用别人的连接。
S07-M37P→AAPP↓interaction.result—；不等待仅完成SDP交换，尚未接通。
S07-M38A→PAPP↑interaction.mediaStateinteraction.result；10秒应用实际连通上报，平台还要校验媒体节点状态。
S07-M39P→AAPP↓interaction.result—；不等待确认状态已受理，不等于首帧显示。
S07-M40A→PAPP↑interaction.endinteraction.result；10秒第二观看者退出，只释放其Peer和订阅。
S07-M41P→AAPP↓interaction.result—；不等待源仍被第一观看者使用，不停共享视频。
S07-M42P→DSIG↓trackControl反方向 trackState；10秒publish/stop 控制源轨；subscribe/unsubscribe 仅本参与端订阅；pause/resume 只作用本端发布或订阅，不关闭其他观看者。请求不等于实际生效。
S07-M43D→PSIG↑trackState—；不等待双向实际状态；应答同 token 和 code，主动报告独立 token。设备失联只能标 unknown，不能假报 stopped。
S07-M44P→DSIG↓sessionEnded—；不等待主动结束用原 token 和 code；其他结束用独立事件 token 与 eventSeq。ended 是唯一会话终态。
S07-M45P→AAPP↓interaction.state—；不等待原操作者/参与者会话事件；与 interaction.result 独立；有 eventSeq。
S07-M46D→PSIG↑sessionRejectrequestAck；10秒沿用邀请 token；不创建媒体连接，不抢占现有前台会话。
S07-M47P→DSIG↓requestAck—；不等待成功拒绝请求的 code=200，与业务拒绝原因区分；后发独立 sessionEnded 终态通知。
S07-M48P→DSIG↓sessionEnded—；不等待主动结束用原 token 和 code；其他结束用独立事件 token 与 eventSeq。ended 是唯一会话终态。

逐条JSON

S07-M01 · interaction.open

{
  "msgToken": "s07-98",
  "method": "interaction.open",
  "params": {
    "purpose": "ipcLiveView",
    "cameraId": "front"
  },
  "target": {
    "productID": "p-demo",
    "deviceName": "device-demo"
  }
}

S07-M02 · interaction.result

{
  "msgToken": "s07-98",
  "method": "interaction.result",
  "sessionId": "s07-session",
  "code": 200,
  "data": {
    "operation": "interaction.open",
    "state": "invited",
    "sessionId": "s07-session"
  }
}

S07-M03 · sessionInvite

{
  "msgToken": "s07-99",
  "method": "sessionInvite",
  "sessionId": "s07-session",
  "eventSeq": 1,
  "params": {
    "purpose": "ipcLiveView",
    "admission": "direct",
    "cameraId": "front",
    "transport": "webrtc",
    "tracks": [
      {
        "trackId": "video-1",
        "kind": "video",
        "sourceId": "front",
        "direction": "sendonly",
        "codec": "H264",
        "state": "requested"
      }
    ],
    "expiresAt": 1900000000000
  }
}

S07-M04 · sessionAccept

{
  "msgToken": "s07-99",
  "method": "sessionAccept",
  "sessionId": "s07-session",
  "params": {
    "acceptedTracks": [
      "video-1"
    ]
  }
}

S07-M05 · requestAck

{
  "msgToken": "s07-99",
  "method": "requestAck",
  "sessionId": "s07-session",
  "code": 200,
  "data": {
    "requestMethod": "sessionAccept",
    "result": {
      "state": "negotiating"
    }
  }
}

S07-M06 · mediaOffer

{
  "msgToken": "s07-100",
  "method": "mediaOffer",
  "sessionId": "s07-session",
  "params": {
    "mediaRevision": 1,
    "webrtc": {
      "iceMode": "complete",
      "sdp": "<SDP offer>"
    }
  }
}

S07-M07 · mediaAnswer

{
  "msgToken": "s07-100",
  "method": "mediaAnswer",
  "sessionId": "s07-session",
  "code": 200,
  "data": {
    "mediaRevision": 1,
    "webrtc": {
      "iceMode": "complete",
      "sdp": "<SDP answer>"
    }
  }
}

S07-M08 · mediaState

{
  "msgToken": "s07-101",
  "method": "mediaState",
  "sessionId": "s07-session",
  "params": {
    "mediaRevision": 1,
    "state": "connected"
  }
}

S07-M09 · requestAck

{
  "msgToken": "s07-101",
  "method": "requestAck",
  "sessionId": "s07-session",
  "code": 200,
  "data": {
    "requestMethod": "mediaState",
    "result": {
      "mediaRevision": 1,
      "state": "connected"
    }
  }
}

S07-M10 · interaction.mediaOffer

{
  "msgToken": "s07-102",
  "method": "interaction.mediaOffer",
  "sessionId": "s07-session",
  "params": {
    "mediaRevision": 1,
    "webrtc": {
      "iceMode": "complete",
      "sdp": "<SDP viewer offer>"
    }
  }
}

S07-M11 · interaction.result

{
  "msgToken": "s07-102",
  "method": "interaction.result",
  "sessionId": "s07-session",
  "code": 200,
  "data": {
    "operation": "interaction.mediaOffer",
    "state": "negotiating",
    "mediaRevision": 1,
    "webrtc": {
      "iceMode": "complete",
      "sdp": "<SDP viewer answer>"
    }
  }
}

S07-M12 · interaction.mediaState

{
  "msgToken": "s07-103",
  "method": "interaction.mediaState",
  "sessionId": "s07-session",
  "params": {
    "mediaRevision": 1,
    "state": "connected"
  }
}

S07-M13 · interaction.result

{
  "msgToken": "s07-103",
  "method": "interaction.result",
  "sessionId": "s07-session",
  "code": 200,
  "data": {
    "operation": "interaction.mediaState",
    "state": "connected",
    "mediaRevision": 1
  }
}

S07-M14 · sessionEstablished

{
  "msgToken": "s07-104",
  "method": "sessionEstablished",
  "sessionId": "s07-session",
  "eventSeq": 2,
  "data": {
    "state": "established",
    "mediaRevision": 1
  }
}

S07-M15 · trackControl

{
  "msgToken": "s07-105",
  "method": "trackControl",
  "sessionId": "s07-session",
  "eventSeq": 3,
  "params": {
    "trackId": "video-1",
    "operation": "publish",
    "mediaRevision": 1
  }
}

S07-M16 · trackState

{
  "msgToken": "s07-105",
  "method": "trackState",
  "sessionId": "s07-session",
  "code": 200,
  "data": {
    "trackId": "video-1",
    "state": "active",
    "mediaRevision": 1
  }
}

S07-M17 · interaction.open

{
  "msgToken": "s07-106",
  "method": "interaction.open",
  "params": {
    "purpose": "ipcTalk",
    "cameraId": "front",
    "callId": "existing-im-call"
  },
  "target": {
    "productID": "p-demo",
    "deviceName": "device-demo"
  }
}

S07-M18 · interaction.result

{
  "msgToken": "s07-106",
  "method": "interaction.result",
  "sessionId": "s07-talk",
  "code": 200,
  "data": {
    "operation": "interaction.open",
    "state": "invited",
    "sessionId": "s07-talk"
  }
}

S07-M19 · sessionInvite

{
  "msgToken": "s07-107",
  "method": "sessionInvite",
  "sessionId": "s07-talk",
  "eventSeq": 1,
  "params": {
    "purpose": "ipcTalk",
    "admission": "direct",
    "transport": "webrtc",
    "tracks": [
      {
        "trackId": "mic-1",
        "kind": "audio",
        "sourceId": "mic",
        "direction": "sendonly",
        "codec": "opus",
        "state": "requested"
      },
      {
        "trackId": "speaker-1",
        "kind": "audio",
        "sourceId": "speaker",
        "direction": "recvonly",
        "codec": "opus",
        "state": "requested"
      }
    ],
    "expiresAt": 1900000000000,
    "cameraId": "front"
  }
}

会议绑定和IM发言资格由后端以可信身份保存、持续复核，不由设备上传成员权限或借用预览会话。此独立对讲邀请仅请求麦克风发布和扬声器接收，不附加视频、AI交互模式或AI取帧授权。当前契约与准入已实现，持久对讲Owner及C++实际媒体仍待接入，见支持范围。

S07-M20 · sessionAccept

{
  "msgToken": "s07-107",
  "method": "sessionAccept",
  "sessionId": "s07-talk",
  "params": {
    "acceptedTracks": [
      "mic-1",
      "speaker-1"
    ]
  }
}

S07-M21 · requestAck

{
  "msgToken": "s07-107",
  "method": "requestAck",
  "sessionId": "s07-talk",
  "code": 200,
  "data": {
    "requestMethod": "sessionAccept",
    "result": {
      "state": "negotiating"
    }
  }
}

S07-M22 · mediaOffer

{
  "msgToken": "s07-108",
  "method": "mediaOffer",
  "sessionId": "s07-talk",
  "params": {
    "mediaRevision": 1,
    "webrtc": {
      "iceMode": "complete",
      "sdp": "<SDP offer>"
    }
  }
}

S07-M23 · mediaAnswer

{
  "msgToken": "s07-108",
  "method": "mediaAnswer",
  "sessionId": "s07-talk",
  "code": 200,
  "data": {
    "mediaRevision": 1,
    "webrtc": {
      "iceMode": "complete",
      "sdp": "<SDP answer>"
    }
  }
}

S07-M24 · mediaState

{
  "msgToken": "s07-109",
  "method": "mediaState",
  "sessionId": "s07-talk",
  "params": {
    "mediaRevision": 1,
    "state": "connected"
  }
}

S07-M25 · requestAck

{
  "msgToken": "s07-109",
  "method": "requestAck",
  "sessionId": "s07-talk",
  "code": 200,
  "data": {
    "requestMethod": "mediaState",
    "result": {
      "mediaRevision": 1,
      "state": "connected"
    }
  }
}

S07-M26 · interaction.mediaOffer

{
  "msgToken": "s07-talk-peer-3",
  "method": "interaction.mediaOffer",
  "sessionId": "s07-talk",
  "params": {
    "mediaRevision": 1,
    "webrtc": {
      "iceMode": "complete",
      "sdp": "<SDP talk offer>"
    }
  }
}

S07-M27 · interaction.result

{
  "msgToken": "s07-talk-peer-3",
  "method": "interaction.result",
  "sessionId": "s07-talk",
  "code": 200,
  "data": {
    "operation": "interaction.mediaOffer",
    "state": "negotiating",
    "mediaRevision": 1,
    "webrtc": {
      "iceMode": "complete",
      "sdp": "<SDP talk answer>"
    }
  }
}

S07-M28 · interaction.mediaState

{
  "msgToken": "s07-talk-peer-4",
  "method": "interaction.mediaState",
  "sessionId": "s07-talk",
  "params": {
    "mediaRevision": 1,
    "state": "connected"
  }
}

S07-M29 · interaction.result

{
  "msgToken": "s07-talk-peer-4",
  "method": "interaction.result",
  "sessionId": "s07-talk",
  "code": 200,
  "data": {
    "operation": "interaction.mediaState",
    "state": "connected",
    "mediaRevision": 1
  }
}

S07-M30 · sessionEstablished

{
  "msgToken": "s07-110",
  "method": "sessionEstablished",
  "sessionId": "s07-talk",
  "eventSeq": 2,
  "data": {
    "state": "established",
    "mediaRevision": 1
  }
}

S07-M31 · interaction.end

{
  "msgToken": "s07-111",
  "method": "interaction.end",
  "sessionId": "s07-talk",
  "params": {
    "reason": "userStopped"
  }
}

S07-M32 · interaction.result

{
  "msgToken": "s07-111",
  "method": "interaction.result",
  "sessionId": "s07-talk",
  "code": 200,
  "data": {
    "operation": "interaction.end",
    "state": "ended"
  }
}

S07-M33 · sessionEnded

{
  "msgToken": "s07-112",
  "method": "sessionEnded",
  "sessionId": "s07-talk",
  "eventSeq": 3,
  "data": {
    "state": "ended",
    "reason": "userStopped"
  }
}

S07-M34 · interaction.subscribe

{
  "msgToken": "s07-113",
  "method": "interaction.subscribe",
  "sessionId": "s07-session",
  "params": {
    "trackId": "video-1"
  }
}

S07-M35 · interaction.result

{
  "msgToken": "s07-113",
  "method": "interaction.result",
  "sessionId": "s07-viewer-b",
  "code": 200,
  "data": {
    "operation": "interaction.subscribe",
    "state": "negotiating",
    "sessionId": "s07-viewer-b",
    "playbackToken": "<viewer-b-only-token>"
  }
}

S07-M36 · interaction.mediaOffer

{
  "msgToken": "s07-viewer-b-peer-7",
  "method": "interaction.mediaOffer",
  "sessionId": "s07-viewer-b",
  "params": {
    "mediaRevision": 1,
    "webrtc": {
      "iceMode": "complete",
      "sdp": "<SDP second viewer offer>"
    }
  }
}

S07-M37 · interaction.result

{
  "msgToken": "s07-viewer-b-peer-7",
  "method": "interaction.result",
  "sessionId": "s07-viewer-b",
  "code": 200,
  "data": {
    "operation": "interaction.mediaOffer",
    "state": "negotiating",
    "mediaRevision": 1,
    "webrtc": {
      "iceMode": "complete",
      "sdp": "<SDP second viewer answer>"
    }
  }
}

S07-M38 · interaction.mediaState

{
  "msgToken": "s07-viewer-b-peer-8",
  "method": "interaction.mediaState",
  "sessionId": "s07-viewer-b",
  "params": {
    "mediaRevision": 1,
    "state": "connected"
  }
}

S07-M39 · interaction.result

{
  "msgToken": "s07-viewer-b-peer-8",
  "method": "interaction.result",
  "sessionId": "s07-viewer-b",
  "code": 200,
  "data": {
    "operation": "interaction.mediaState",
    "state": "connected",
    "mediaRevision": 1
  }
}

S07-M40 · interaction.end

{
  "msgToken": "viewer-b-end",
  "method": "interaction.end",
  "sessionId": "s07-viewer-b",
  "params": {
    "reason": "userStopped"
  }
}

S07-M41 · interaction.result

{
  "msgToken": "viewer-b-end",
  "method": "interaction.result",
  "sessionId": "s07-viewer-b",
  "code": 200,
  "data": {
    "operation": "interaction.end",
    "state": "ended"
  }
}

S07-M42 · trackControl

{
  "msgToken": "s07-114",
  "method": "trackControl",
  "sessionId": "s07-session",
  "eventSeq": 4,
  "params": {
    "trackId": "video-1",
    "operation": "stop",
    "mediaRevision": 1
  }
}

S07-M43 · trackState

{
  "msgToken": "s07-114",
  "method": "trackState",
  "sessionId": "s07-session",
  "code": 200,
  "data": {
    "trackId": "video-1",
    "state": "stopped",
    "mediaRevision": 1
  }
}

S07-M44 · sessionEnded

{
  "msgToken": "s07-115",
  "method": "sessionEnded",
  "sessionId": "s07-session",
  "eventSeq": 5,
  "data": {
    "state": "ended",
    "reason": "permissionRevoked"
  }
}

S07-M45 · interaction.state

{
  "msgToken": "s07-116",
  "method": "interaction.state",
  "sessionId": "s07-session",
  "eventSeq": 6,
  "data": {
    "state": "ended",
    "reason": "permissionRevoked"
  }
}

S07-M46 · sessionReject

{
  "msgToken": "s07-99",
  "method": "sessionReject",
  "sessionId": "s07-session",
  "params": {
    "reason": "privacyEnabled"
  }
}

S07-M47 · requestAck

{
  "msgToken": "s07-99",
  "method": "requestAck",
  "sessionId": "s07-session",
  "code": 200,
  "data": {
    "requestMethod": "sessionReject",
    "result": {
      "state": "ended",
      "reason": "privacyEnabled"
    }
  }
}

S07-M48 · sessionEnded

{
  "msgToken": "s07-117",
  "method": "sessionEnded",
  "sessionId": "s07-session",
  "eventSeq": 7,
  "data": {
    "state": "ended",
    "reason": "userRejected"
  }
}

媒体与本地动作

编号路径格式与约束
S07-R01D→PWebRTC ICE + DTLS 握手；完整 SDP 不代表握手成功；只有网络连通后才报告 connected。
S07-R02A→PWebRTC ICE + DTLS；观看者连接成功后回报，不共用其他观看者 Peer。
S07-R03D→PWebRTC DTLS-SRTP H264 视频轨；设备源媒体。
S07-R04P→AWebRTC DTLS-SRTP H264 授权订阅；预览不自动开启观看者麦克风。
S07-R05D→PWebRTC ICE + DTLS 握手；完整 SDP 不代表握手成功；只有网络连通后才报告 connected。
S07-R06A→PWebRTC ICE + DTLS 握手；本参与端独立完成连通验证。
S07-R07A→DWebRTC 经媒体节点双向 Opus 音轨；应用 Peer 必须复用本页独立协商步骤；音频焦点获准后才上行，对讲能力应含AEC或按键收发策略。
S07-R08A→PWebRTC ICE + DTLS 握手；本参与端独立完成连通验证。
S07-R09P→AWebRTC H264 独立观看者订阅；由服务端授权映射共享源；一人退出不影响其他观看者。

异常、状态与资源释放

以下JSON仅为报文正文；编号、方向、说明不发送。loop下一轮需分配新token/inputId；同一次请求重试必须沿用原token。字段以命令手册为准。

路由缩写均展开于公共约定。ACT/PROP超时以产品配置为准；内部工具以工具超时为准，不套用10秒设备统一信令超时。

accept 版本将邀请 admission 改为 accept，设备必须等待真实本地确认；不支持确认则422，不降级 direct。第二观看者按独立 s07-viewer-b 执行应用 SDP/连通流程，服务端维护源轨映射；一个观看者退出仅释放自身订阅，最后订阅者退出才停共享源。撤权先撤销该用户订阅和令牌；隐私开启停所有摄像头会话和AI取帧。设备未回 stopped 时标 unknown，服务端先停止转发。对讲结束不结束预览。

能力不支持、无权限、设备拒绝、协商失败、断网、重复请求、过期会话及迟到媒体按S11共通失败流程和公共错误表处理。业务专属分支以本页为准，不因错误静默打开额外能力。

验证入口

检查本场景对应的支持范围，以及公共流程。示例可解析不等于网络、权限或硬件运行已验证。

更新日志

2026/10/16 16:04
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