IWaypointMissionManager#pushKMZFileToAircraft fails

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Alexis Glass

• 2023年01月20日 13:37

When calling pushKMZFileToAircraft IWaypointMissionManager for a kmz file located in the app's specific storage (i.e., no special permissions required to access - although in any case, external storage permissions have been granted), the following error is reported with SDK v5.2.0:

description: Mission file operate failed . Please check permission 
code: GENERATE_MISSION_FILE_FAILED

What permission is the error referring to? What must be done to successfully push a KMZ? No SDK permissions are being blocked, and as mentioned previously, external storage permissions are granted. Testing with SDK v5.1.1, the same operation was also failing, although in that case with "file not exist" appearing in the logs.

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  Alexis Glass

  • 2023年01月20日 17:25

  I have tested the same kmz using the (somewhat hidden) `JNIWPMZManager`'s `checkWPMZValid()` method, and no problems were reported.

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  DJI Developer Support

  • 2023年01月21日 07:04

  This is because from the Android 10, the permission of Android storage has been change. When I am testing, I just copy the kmz file into the root directory of my RC. You can check online about the Android 10 storage location change log on Google.

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  Alexis Glass

  • 2023年01月23日 10:45

  Thank you for the response.
  
  I am placing the kmz at a file location similar to what follows:

  /storage/emulated/0/Android/data/com.aaaa.bbbbbb/files/Some/Directory/Names/bbbbbb-60ef215f898b05870daf2f3f89173685.kmz

  The application with the package name `com.aaaa.bbbbbb` should need no special permissions to access this file on Android 10; likewise for any code in Mobile SDKv5. Is it nevertheless necessary for the file to be located at a location where permissions would be required?

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  DJI Developer Support

  • 2023年01月24日 07:03

  It should be fine because you have put it into Android/data section. Try move the kmz to the root directory and see what's going on to ensure if the issue comes from the Android read/write permissions. I normally test undet the root directory.

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  Alexis Glass

  • 2023年01月24日 08:16

  Thank you for your response.
  
  I had created the kmz after following these instructions in the FAQ:
  
  

  Q: Wju the kmz file contains both kml and wpml files and their functionalities are similar?

  A: If you are using DJI Pilot 2, your kmz must contain the template.kml file, you don't need the waylines.wpml file. The DJI Pilot 2 app will translate the template.kml file to the waylines.wpml file. The firmware will execute the waylines.wpml file only. If you are using MSDK V5, your kmz file must contain the waylines.wpml file. The firmware will execute the waylines.wpml file after the upload event. If you want to run your kmz file in both DJI Pilot 2 and MSDK V5 app, your kmz file must contain both template.kml and waylines.wpml files.

   

  I understood this to mean that for MSDKV5 applications, only the waylines.wpml was necessary - template.kml would only be required if the same kmz file was expected to be opened with DJI Pilot 2. However, we have succeeded in uploading the kmz from our Android/data section by placing a template.kml file in the kmz. Is it correct to assume that the drone firmware will otherwise ignore the template.kml file?

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  DJI Developer Support

  • 2023年01月24日 08:43

  The firmware still needs to check the existance of template.kml. So for MSDK app you can only write an empty template.kml file. Please read this article, https://sdk-forum.dji.net/hc/en-us/articles/12560010128153-How-to-write-an-empty-template-kml-file-

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  Alexis Glass

  • 2023年01月24日 09:27

  I missed that article - thank you. I think it would be helpful to clarify the  FAQ on this point.

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