When a data point (DP) command is sent, the DP value changes will be called back. Why are the DPs in the callback method sometimes "changed DPs" and sometimes "all DPs"?
Last Updated on：2025-02-28 07:17:26
If a DP is normally sent through the Message Queuing Telemetry Transport (MQTT) channel, a "changed DP" is received. However, if the MQTT connection with the App is interrupted, the DP will be sent through the HTTP interface. After the DP sending is completed, the device information will be pulled again to notify all DPs in the device information through a callback. This is why "all DPs" appear in the callback.
Is this page helpful?
YesFeedbackMarketing Cooperation
Business Cooperation
Customer Service
Media Inquiry
Click for services and help
Help Center
Consult
(001)844-672-5646
Submit Question