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实现设备影子（Device Shadow）模式

未完成

示例

输入
solve()
期望输出
Device shadow delta analysis:
  RPI-001 v4: in_sync=False delta={'alarm_threshold': {'desired': 80.0, 'reported': 75.0}}
  RPI-002 v5: in_sync=False delta={'alarm_threshold': {'desired': 80.0, 'reported': 75.0}}
  ARD-001 v5: in_sync=False delta={'alarm_threshold': {'desired': 80.0, 'reported': 75.0}}
  ARD-002 v4: in_sync=False delta={'alarm_threshold': {'desired': 80.0, 'reported': 75.0}}
  ARD-003 v2: in_sync=False delta={'alarm_threshold': {'desired': 80.0, 'reported': 75.0}}
  ESP-001 v4: in_sync=False delta={'status': {'desired': 'online', 'reported': 'warning'}, 'alarm_threshold': {'desired': 80.0, 'reported': 75.0}}
  ESP-002 v3: in_sync=False delta={'status': {'desired': 'online', 'reported': 'error'}, 'alarm_threshold': {'desired': 80.0, 'reported': 75.0}}
  GW-001 v2: in_sync=False delta={'alarm_threshold': {'desired': 80.0, 'reported': 75.0}}
  RPI-003 v3: in_sync=False delta={'alarm_threshold': {'desired': 80.0, 'reported': 75.0}}
  PLC-001 v1: in_sync=False delta={'status': {'desired': 'online', 'reported': 'maintenance'}, 'alarm_threshold': {'desired': 80.0, 'reported': 75.0}}
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