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            Help Center/IoT/FAQs/Secondary Development/FAQs About Application Development/Calling APIs
            Updated on 2022-02-24 GMT+08:00
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            Calling APIs

            • Authentication API of the IoT Platform Is Successfully Called Locally But Fails to Be Called on Application Servers
            • Error Occurs When an NA Calls an API
            • Online Application Simulator Fails to Deliver Commands
            • Command Is Successfully Delivered Using the Simulator But Fails to Be Delivered by Calling the API
            • Application Server Fails to Deliver Commands and Receives Error Code 403
            • How Does an Application Server Deliver a Cache Command
            • What Does an Expired Command Mean
            • Does the IoT Platform Support Command Resending
            • What Does a Timeout Command Mean
            • Can the IoT Platform Deliver Commands in Batches
            • Are the APIs of the IoT Platform Called Only Using Java
            • What Are the Command States on the IoT Platform
            • Failed to Call the Calling the Registering Directly Connected Devices API
            • APIs Fail To Be Called After a Period of Time While Parameters Remain Unchanged
            • Commands Fail to Be Sent After a Period of Time While the Previous Commands Are Successfully Sent
            • Historical Data Is Not Returned When the Querying Historical Device Data API Is Called
            • Devices Registered with the IoT Platform Are Deleted After a Period of Time
            Parent topic:FAQs About Application Development

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