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File Management

Last Updated on : 2022-12-14 07:10:35download

File management allows connected devices to upload and download general files to and from the storage space on the Tuya IoT Development Platform over MQTT.

This topic describes the topics and data format for file management.

The storage space provides device-based access isolation, protecting data from unauthorized access.
The download URL is valid for a limited time. After it expires, the device should request the download URL again.

Upload a file

Device sends messages

The device requests a presigned URL for upload and then uploads a file using the returned presigned URL.

A file should not exceed 16 MB in size.

Topic: tylink/${deviceId}/ext/file/upload/request

{
    "msgId":"45lkj3551234***",
  	"time":1626197189638,
	"data":{
        "bizType":"FILE",
        "fileName":"apple.png"
    }
}

Parameter description

Parameter	Type	Description	Required	Remark
${deviceId}	String	Device ID	Yes	If this is a sub-device, the `deviceId` should be the ID of the sub-device.
version	String	Protocol version	No	The protocol version defaults to 1.0, which is the only valid value currently.
msgId	String	Message ID	Yes	A string up to 32 characters in length. A message ID is used to correlate responses and requests.
time	Number	Message timestamp	Yes	The Unix timestamp when a message is sent, in seconds (10-digit value) or milliseconds (13-digit value).
data	Object	Time service parameters	Yes	Get the time service parameters.
data.bizType	String	Business type	Yes	The supported file types. The default value is `FILE`.
data.fileName	String	File name	Yes	For example, `apple.png`.

Device receives messages

The device receives a presigned URL for upload.

Topic: tylink/${deviceId}/ext/file/upload/response

{
    "msgId":"45lkj3551234***",
  	"time":1626197189638,
	"data":{
        "bizType":"FILE",
        "url":"https://tuya-temp-fileupload-1254153901.cos.ap-shanghai.myqcloud.com/iot-platform-tmp/bay1617694933431vh5n/1631015173bbb14756aa2.png?sign=q-sign-algorithm%3Dsha1%26q-ak%3DAKIDopcCYgw0qRoyV5qfKjvg2pPkqESnb5zI%26q-sign-time%3D1631015173%3B1631018773%26q-key-time%3D1631015173%3B1631018773%26q-header-list%3D%26q-url-param-list%3D%26q-signature%3D4670e7d3cf500f9210a0f2d5bc9e98d6e*****a6"
    }
}

Parameter description

Parameter	Type	Description	Required	Remark
${deviceId}	String	Device ID	Yes	If this is a sub-device, the `deviceId` should be the ID of the sub-device.
version	String	Protocol version	No	The protocol version defaults to 1.0, which is the only valid value currently.
msgId	String	Message ID	Yes	A string up to 32 characters in length. A message ID is used to correlate responses and requests.
time	Number	Message timestamp	Yes	The Unix timestamp when a message is sent, in seconds (10-digit value) or milliseconds (13-digit value).
data	Object	Time service parameters	Yes	Get the time service parameters.
data.bizType	String	Business type	Yes	The supported file types. The default value is `FILE`.
data.url	String	The presigned URL to upload a file.	Yes	The presigned URL to upload a file to the cloud.

Download a file

Device sends messages

The device requests the URL to download the specified file from the cloud.

Topic: tylink/${deviceId}/ext/file/download/request

{
    "msgId":"45lkj3551234***",
  	"time":1626197189638,
	"data":{
        "bizType":"FILE",
        "fileName":"apple.png"
    }
}

Parameter description

Parameter	Type	Description	Required	Remark
${deviceId}	String	Device ID	Yes	If this is a sub-device, the `deviceId` should be the ID of the sub-device.
version	String	Protocol version	No	The protocol version defaults to 1.0, which is the only valid value currently.
msgId	String	Message ID	Yes	A string up to 32 characters in length. A message ID is used to correlate responses and requests.
time	Number	Message timestamp	Yes	The Unix timestamp when a message is sent, in seconds (10-digit value) or milliseconds (13-digit value).
data	Object	Time service parameters	Yes	Get the time service parameters.
data.bizType	String	Business type	Yes	The supported file types. The default value is `FILE`.
data.fileName	String	File name	Yes	For example, `apple.png`.

Device receives messages

The device receives the URL to download the specified file.

Topic: tylink/${deviceId}/ext/file/download/response

{
    "msgId":"45lkj3551234***",
  	"time":1626197189638,
	"data":{
        "bizType":"FILE",
        "fileName": "apple.png",
        "url":"https://tuya-temp-fileupload-1254153901.cos.ap-shanghai.myqcloud.com/iot-platform-tmp/bay1617694933431vh5n/1631015173bbb14756aa2.png?sign=q-sign-algorithm%3Dsha1%26q-ak%3DAKIDopcCYgw0qRoyV5qfKjvg2pPkqESnb5zI%26q-sign-time%3D1631015173%3B1631018773%26q-key-time%3D1631015173%3B1631018773%26q-header-list%3D%26q-url-param-list%3D%26q-signature%3D4670e7d3cf500f9210a0f2d5bc9e98d6******a6",
        "expirationMillis": 1656319250000
    }
}

Parameter description

Parameter	Type	Description	Required	Remark
${deviceId}	String	Device ID	Yes	If this is a sub-device, the `deviceId` should be the ID of the sub-device.
version	String	Protocol version	No	The protocol version defaults to 1.0, which is the only valid value currently.
msgId	String	Message ID	Yes	A string up to 32 characters in length. A message ID is used to correlate responses and requests.
time	Number	Message timestamp	Yes	The Unix timestamp when a message is sent, in seconds (10-digit value) or milliseconds (13-digit value).
data	Object	Time service parameters	Yes	Get the time service parameters.
data.bizType	String	Business type	Yes	The supported file types. The default value is `FILE`.
data.url	String	The presigned URL to download a file.	Yes	The presigned URL to download a file. A presigned URL expires after a set timeout, which is specified in the parameter `expirationMillis`.
data.expirationMillis	Long	Expiration time of the download URL, in milliseconds	Yes	The time when the download URL will expire, for example, `1656319250000`.

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