NTRIP RTK Listeners break when vehicle is power cycled

[AdamWardVGP]

Hello,

I'm writing to inquire about recommended steps for application cleanup. I have a specific use case where the Pilot 2 app behaves different from mine, so I'm hoping for some guidance since the pilot 2 is performing better.

The place where I notice a difference is using NTRIP RTK connections.

In Pilot 2, I can enable RTK, set it to NTRIP provider, save NTRIP settings, and pilot 2 will connect, with FIX positioning.

Where I notice an issue is if I power off and back on the drone once in this state, when I do so Pilot 2 sometimes doesn't reconnect and positioning never becomes fixed.

The simplest way around this is to close Pilot 2 by swiping away, and then reopen. I can then see RTK FIX re-establish after some time.

In my app, I can follow these same steps but with API calls:

RTKCenter.setAircraftRTKModuleEnabled(true, ...)
RTKCenter.setRTKReferenceStationSource(NTRIP_NETWORK_SERVICE, ...)
RTKCenter.customRTKManager.customNetworkRTKSettings = ...
RTKCenter.customRTKManager.startNetworkRTKService(...)

When I monitor RTKCenter.customRTKManager.addNetworkRTKServiceInfoListener I reach state RTKServiceState.TRANSMITTING
and rtkCenter.addRTKLocationInfoListener will have RTKLocation.positioningSolution of FIXED_POINT

If I then power off and on the vehicle sometimes I get stuck in RTKServiceState.DISCONNECTED just like in Pilot 2.

However closing my app does not fix this, subsequent app sessions will still show RTKServiceState.DISCONNECTED state.

I've tried invoking the following APIs when my app is closed

    rtkCenter.customRTKManager.destroy()
    rtkCenter.destroy()
    // and
    SDKManager.getInstance().destroy()

This however doesn't seem to fix the issue. Can you please advice what calls Pilot 2 could be making that help with the resolution of this issue?

[dji-dev]

Agent comment from YIGUI LIU in Zendesk ticket #140704:

Dear Developer,

The Pilot 2 APP doesn't integrate the MSDK, so we can't know their implementation method.
You can try to add a retry mechanism. For example, close the RTK service via stopNetworkRTKService and then start it again via startNetworkRTKService.

Best Regards,
DJI Innovations SDK Technical Support Team

°°°

[AdamWardVGP]

Hello, I already have similar retry logic in this code in an attempt to work around but it will still remain in DISCONNECTED state.

…

On Wed, Apr 23, 2025 at 12:19 AM DJI ***@***.***> wrote: Agent comment from YIGUI LIU in Zendesk ticket #140704 <https://djisdksupport.zendesk.com/agent/tickets/140704>: Dear Developer, The Pilot 2 APP doesn't integrate the MSDK, so we can't know their implementation method. You can try to add a retry mechanism. For example, close the RTK service via stopNetworkRTKService and then start it again via startNetworkRTKService. Best Regards, DJI Innovations SDK Technical Support Team *°°°* — Reply to this email directly, view it on GitHub <#553 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAEQSOPQRFMQ7JO3AMZX2G32245GLAVCNFSM6AAAAAB3UWVITCVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDQMRTGMYDAMZXGY> . You are receiving this because you authored the thread.Message ID: ***@***.***> *dji-dev* left a comment (dji-sdk/Mobile-SDK-Android-V5#553) <#553 (comment)> Agent comment from YIGUI LIU in Zendesk ticket #140704 <https://djisdksupport.zendesk.com/agent/tickets/140704>: Dear Developer, The Pilot 2 APP doesn't integrate the MSDK, so we can't know their implementation method. You can try to add a retry mechanism. For example, close the RTK service via stopNetworkRTKService and then start it again via startNetworkRTKService. Best Regards, DJI Innovations SDK Technical Support Team *°°°* — Reply to this email directly, view it on GitHub <#553 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAEQSOPQRFMQ7JO3AMZX2G32245GLAVCNFSM6AAAAAB3UWVITCVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDQMRTGMYDAMZXGY> . You are receiving this because you authored the thread.Message ID: ***@***.***>

[AdamWardVGP]

Just checking in for a followup.

• Removing listeners and adding them again does not fix this issue
• Calls to destroy do not fix it
• stopNetworkRTKService/startNetworkRTKService do not fix this either
• General calls to disable/enable RTK do not resolve this either.

If you have any other suggestions I'm happy to try them but this appears to be a bug internal to the SDK. Do you know if this is something on your teams backlog to fix in an upcoming release of the MSDK?

[dji-dev]

Agent comment from YIGUI LIU in Zendesk ticket #140704:

Dear Developer,

The MSDK only forwards the data of the RTK module for display. At present, the MSDK team does not consider this to be a bug that needs to be fixed.

After enabling the RTK service through the MSDK interface, usually, you can only wait for the RTK module itself to establish a connection and return the status. What can be done at the MSDK level is to add a retry mechanism for enabling and disabling the RTK service. Thank you for your understanding and support.

Best Regards,
DJI Innovations SDK Technical Support Team

°°°