Why does the device binding state show NOT_REQUIRED?

The logic of device binding to activate the SDK has been abandoned in MSDK V4, so now the status obtained through getAircraftBindingState is NOT_REQUIRED.

The activation process of the SDK in MSDK V4 is as follows:

1. Apply for an APP_KEY, where the packageName needs to be the same as the applicationId of the project;
2. Fill in the APP_KEY at the corresponding location, the filling location can be referenced in the sample code: https://github.com/dji-sdk/Mobile-SDK-Android/blob/master/Sample%20Code/app/src/main/AndroidManifest.xml#L47；
3. Call com.secneo.sdk.Helper.install when the App starts, the call location can be referenced in the sample code: https://github.com/dji-sdk/Mobile-SDK-Android/blob/master/Sample%20Code/app/src/main/java/com/dji/sdk/sample/internal/controller/DJISampleApplication.java#L77；
4. Call DJISDKManager.getInstance().registerApp to verify the APP_KEY;
5. After successful verification in step 4, call DJISDKManager.getInstance().startConnectionToProduct to start recognizing the device.