What is the reason why the video intelligent analysis platform easycvr is locally controllable but the superior equipment cannot control the subordinate equipment?

As we all know EasyCVR It is a video platform that supports a wide range of protocols , Therefore, it is compatible with the advantages of many protocols , For example, support PTZ control equipment , It also supports cascading platforms through different protocols . In the near future EasyCVR During the test, it appears that the local platform can control the subordinate equipment through the PTZ , However, the superior equipment cannot control the situation of the subordinate equipment .

In view of this situation , We did packet capturing analysis .

Through packet capturing analysis , You can view the control messages sent by the superior , It is normally sent and responded to at this level , But when it is forwarded to the lower level through the current level , Subordinate replies 400 error .

At this point, the problem is found , because EasyCVR Cascaded channels and the reality of lower level devices id Dissimilarity , So when sending control commands to subordinates through superiors , You need to convert again at the lower level , Add the following code ：

gbDevID := gbsChns[0].DeviceID
sipDev := uas.Server.GetDevice(gbDevID)
if sipDev == nil {
   log.Println(" cascade MakePTZControlRequest error ")
   return
}
reqControl, _, err = uas.Server.MakeDragZoomInControlRequest(code, uas.Server.Realm, length, width, midPointX, midPointY, lengthX, lengthY)
if err != nil {
   log.Println(" cascade MakeDragZoomInControlRequest error ", err)
   return
}
err = reqControl.SendByTransport(sipDev.Transport)
if err != nil {
   log.Println(" Cascade transmission MakePTZControlRequest error ", err)
   return
}

Send the control message through the superior again , And grab the bag to check , It is found that the information can be sent normally .