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Drone Control Unavailable

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15 comments

  • Jim McAndrew

    It is possible it reached a NFZ or the edge of the max distance setting in the firmware (which you can increase in the UI or issue a command).

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  • Marian Redmann

    Dear Jim,
    I am afraid both are not possible as I based this mission on the mission I flew before. It is in the beginning a copy of the route, and this plan the Mini flew withoit a problem. First it went to an access point which was 100 m in the air. In the plan that didn't work, it flew the exact same route but stopped around 50 m.
    So I can rule out both options. I had a booster on the remote control in both plans and antennas pointed with the flat sides above. So it should have worked.
    How can I avoid this?
    Also whats the best way to handle this situtation?
    I had to stop dronelink (tryed to restart, did not work either) and switched to Litchi to fly the drone down manually.
    Best
    marian

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  • Jim McAndrew

    It is hard to say how to avoid it since we don't know the actual cause yet. Can you share a link to the mission plan so I can try it? As far as how to take back control:

    https://support.dronelink.com/hc/en-us/articles/360036830214-How-do-I-take-over-control-during-a-mission-

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  • Marian Redmann

    I have put the option on the repo to public and named it:
    Test Flights for review for Jim #1
    can you see it that way? The First was sucessfully flown (solved yesterdays issue with telemetry delayed)
    the alternative is the one that didn't work

    Yes, the controler of the mavic don not have the s button etc. so the RTH button seems to be the only option?

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  • Jim McAndrew

    Sadly yes, the RTH button is the only hardware option to take back control since DJI didn't include a flight mode switch (like every other drone they have ever released). I just ran your mission 100% success, no issues. To me that points to an environment condition (EM interference, loss of GPS (even if only temporary), etc).

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  • Marian Redmann

    It may have been interference as the Mini is Wifi based as I understand. What i do not understand is that when I switched off the controler to restart, the Mini started to come back, so that the controler and the Mini must have had some sort of connection? Why can't the controler send the dronelink commands whereas it can send a signal that its not longer activated? Do you know a reason for this?

    Also what would you suggest? Try the mission again another day? Or just change some parameters?

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  • Jim McAndrew

    If you turn off the RC, the drone knows it has become disconnected (DJI firmware) and automatically initiates RTH. The only other thing I can think of is just trying the same plan in a different area to prove that it is an environment factor.

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  • Marian Redmann

    I see, very good idea, I will try again at the weekend in another area which is outside of the city in a field and will let you know the result.

    for that the drone knows it was disconnected there had to be a connection. Why couldn't the app use this connection? Are these different connections?

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  • Marian Redmann

    I try to copy the plan and move to another location but I am not really sure how it works, is there a tutorial for this?

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  • Jim McAndrew

    On copy: https://www.youtube.com/watch?v=_Fb_3UvhY4I

    For moving, just navigate anywhere on the map with the plan open, right click, move reference, then answer move all components on the popup.

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  • Marian Redmann

    Dear Jim,

    I did as you said and runned the mission 2 times with the DJI Mavic Mini without problems. This seems to indicate that at the first location was interference?

    Then I rebootet everything and switched to my Mavic Pro. The app recognized the Mavic Pro.The Pro did start but after 30 m the app sait "Unable to Take Control" "The aircraft  is taking off". I restarted everything but it was the same result. How can I use this Mission with the DJI Mavic Pro?

    Thank you best
    Marian

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  • Jim McAndrew

    Yes, probably environment / interference.

    On the Mavic Pro, can you try starting the mission while already in the air?

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  • Marian Redmann

    I tryed that but it didn't work. It sait 11m to starting point but it was 11m wherever I went. I was in the starting zone and kept insisting in the 11m. I than let the mavic land in my hand and started the mission, It went of ass supposed but than suddenly stopped with the message "Unable to take control".

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  • Marian Redmann

    Hi Jim,
    i have tested it again with the Mavic Pro and it worked like this, I couldn't start the dronelink plan while in the air, I startet the Mavic with Dronelink, it took off till about 10 meters or more and stayed , the message appeared Drone contol unavailable, same message as last time. I dismissed it and the started the program again, the mavic went down and plew the plan till the endpoint , controller now said joystick, in the end after plan was finished it said landing, but did not land, when I pushed on button, it was landing. Repeated this twice, same procedure. Why is this happening? (Anyway it worked, but is it supposed to work like that?)
    Best

    Marian

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  • Jim McAndrew

    DJI has auto-land and auto-takeoff functions built-in to their firmware, and it sounds like those functions are not working 100% of the time on your drone for some reason. Unfortunately, Dronelink has no control over the behavior of these functions. It just blindly issues the takeoff or land command and the DJI SDK does the rest, reporting errors when they happen.

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