例如，设备代理可能会在捕获或接收数据时发布事件消息，指示已经触发了动作传感器或已经读取了RFID标签。
For example, a device agent might publish an event message whenever it captures or receives data indicating a motion sensor has been triggered or that an RFID tag has been read.
这个常见的错误消息指示所接收或发送的数据不是所预期的数据。
This common error message indicates that the data being received or sent is not what is expected.
由于现在已经从服务器接收完数据，请求就完成了，可以关闭网络活动指示器了，如清单4所示。
Because you are done receiving data from the server at this point, your request is complete and you can turn off the network activity indicator, as listing 4 demonstrates.
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