Broadcasts a message to online devices of a product. You can specify all online devices or only the online devices that subscribe to a specific topic.
Usage notes
You can set TopicFullName in the request to specify the devices to which you want to broadcast the message. For more information, see the description of the TopicFullName parameter in this topic.
QPS limits
You can call this operation up to 1 time per second per account to broadcast a message to online devices that subscribe to a specific topic.
You can call this operation up to 1 time per minute per account to broadcast a message to all online devices of a product.
The Resource Access Management (RAM) users of an Alibaba Cloud account share the quota of the account.
Debugging
Request parameters
Parameter | Type | Required | Example | Description |
Action | String | Yes | PubBroadcast | The operation that you want to perform. Set the value to PubBroadcast. |
MessageContent | String | Yes | aGVsbG93b3JsZA | The message content that you want to send. The size of a message cannot exceed 64 KB. To generate the message content, convert the raw message into binary data and perform Base64 encoding. Note IoT Platform decodes data by using the Base64 algorithm and then sends the decoded message to the device. This way, the device does not need to decode the Base64-encoded data. |
ProductKey | String | Yes | aldeji3***** | The ProductKey of the product to which the devices belong. The ProductKey is a unique identifier issued by IoT Platform to the product. You can view the information about all products within the current Alibaba Cloud account in the IoT Platform console or by calling the QueryProductList operation. |
IotInstanceId | String | No | iot_instc_pu****_c*-v64******** | The instance ID. You can view the instance ID on the Overview page in the IoT Platform console. Important
For more information, see Overview. |
TopicFullName | String | No | /broadcast/UPqSxj2vXXX/xxx | The topic name.
Note
|
In addition to the preceding operation-specific request parameters, you must specify common request parameters when you call this operation. For more information, see Common parameters.
Response parameters
Parameter | Type | Example | Description |
Code | String | iot.system.SystemException | The error code returned if the request failed. For more information, see the Error codes section of this topic. |
ErrorMessage | String | A system exception occurred. | The error message returned if the request failed. |
MessageId | Long | 1234291569964771840 | The message ID that is generated by IoT Platform when the message is sent. |
RequestId | String | BB71E443-4447-4024-A000-EDE09922891E | The request ID. |
Success | Boolean | true | Indicates whether the request was successful. Valid values:
|
Examples
Sample requests
https://iot.cn-shanghai.aliyuncs.com/?Action=PubBroadcast
&ProductKey=al**********
&TopicFullName=/broadcast/UPq****/xxx
&MessageContent=aGVsbG93b3JsZA
&<Common request parameters>
Sample success responses
XML
format
<PubBroadcastResponse>
<RequestId>BB71E443-4447-4024-A000-EDE09922891E</RequestId>
<MessageId>1234291569964771840</MessageId>
<Success>true</Success>
</PubBroadcastResponse>
JSON
format
{
"RequestId":"BB71E443-4447-4024-A000-EDE09922891E",
"MessageId":1234291569964771840,
"Success":true
}
Error codes
For a list of error codes, see Service error codes.