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    What causes error codes 135 and 207009 when a device is going online?
    What are the differences in features between the new versions of SmartLife App SDK (v4.0 and later) and legacy SDKs (earlier than v4.0)?
    What are the differences between the development edition and official edition of SmartLife App SDK v5.x?
    Is there a 100-user limit for SDK version 3.x?
    Is there an additional charge for integrating Amazon Alexa and Google Assistant using the Smart App SDK? What are the fee items?
    Do I need to register and log in first to use the features in the SmartLife SDK?
    If I purchase the official edition of SmartLife App SDK and upgrade to v5.x, will the normal running of the app developed based on v3.x be affected?
    After modifying the package name of the App SDK, is it still necessary to rebuild the SDK?
    Does SDK have a function to determine whether this account has been registered before obtaining the verification code?
    Can a user UID log in on multiple devices?

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