Hi DJI moderators,

Can you inform me how your drones act when flying in ATTI mode (due to some errors ect) and the connection AC<>RC gets broken? (full disconnect)

Spark > starts an autolanding after few seconds.
MA > ?
MP > ?
MPP > ?
M2 > ?

Do all your types act in the same way ? (if not, why not ?)

Thank you in advance.

cheers
JJB

Uh, not a single moderator to give some answers?

Hi DJI moderators,

Why not answering a simple question ?

cheers
JJB

Maybe they just don't know.

Montfrooij Posted at 3-26 05:44
Maybe they just don't know.

uh, i really do hope that DJI can inform me and this forum how their drones behave when this happens.
Happens not a lot,  but it does happens.

This info needed for a search plan, does it drift away in ATTI with no connection to the RC or does it starts to autoland after x seconds. ?? (guess that is bit safer than just let it drift away with 98% battery....)

BTW i have asked DJI support and 2 moderators via PM to answer....

Management wise i would expect within few days after posting a msg saying "acknowlegde your question and working on it".
Mayby i should have added a nice picture in the same posting....

cheers
JJB

JJB* Posted at 3-26 06:24
uh, i really do hope that DJI can inform me and this forum how their drones behave when this happens.
Happens not a lot,  but it does happens.

I think this behavior is undocumented, since you can't force it.

Montfrooij Posted at 3-26 06:29
I think this behavior is undocumented, since you can't force it.

true, but if a RTH can solely starts from a disconnect drone so can an autoland automatically starts when it looses connection in ATTI.

So DJI can programm this into the SW, Spark does autoland after few seconds in ATTI+Disconnect.

and the other drone types ??

JJB* Posted at 3-26 06:33
true, but if a RTH can solely starts from a disconnect drone so can an autoland automatically starts when it looses connection in ATTI.

So DJI can programm this into the SW, Spark does autoland after few seconds in ATTI+Disconnect.

Hi JJB,
Based on this experience while trying prop protectors in GPS shielded buildings and very dark rooms (see end part of vid) I believe the Mavic Pro will continue to respond to sticks and not attempt to land.
There was no stability during hover, but it did maintain a degree of altitude control. Because of the massive brick roof, no GPS was present and the darkness, well represented in the video, would prevent the sensors from working, even if they were turned on.

I hope this helps.

AlansDronePics Posted at 3-27 08:10
Hi JJB,
Based on this experience while trying prop protectors in GPS shielded buildings and very dark rooms (see end part of vid) I believe the Mavic Pro will continue to respond to sticks and not attempt to land.
There was no stability during hover, but it did maintain a degree of altitude control. Because of the massive brick roof, no GPS was present and the darkness, well represented in the video, would prevent the sensors from working, even if they were turned on.

Hi Alan,

great video, must have been hard work to control your MP!

But you were in control all the time, i would like to know what is happening in ATTI and no connection to the RC.

cheers
JJB

JJB* Posted at 3-27 08:17
Hi Alan,

great video, must have been hard work to control your MP!

Ah yes! Sorry, I have not had that experience.

JJB* Posted at 3-26 06:33
true, but if a RTH can solely starts from a disconnect drone so can an autoland automatically starts when it looses connection in ATTI.

So DJI can programm this into the SW, Spark does autoland after few seconds in ATTI+Disconnect.

I'm not sure if they can.
Lot's of variables that have an influence on how the drone reacts.

Montfrooij Posted at 3-28 02:26
I'm not sure if they can.
Lot's of variables that have an influence on how the drone reacts.

Hi Montfrooij,

Only 2 variables in this,  drone in : 1) ATTI mode 2) Lost Connection to RC.

Spark does autoland in ATTI+NoConnection.
I will test my MA out this way.

So why does DJI not answering this simple question?

Cheers
JJB

JJB* Posted at 3-28 02:57
Hi Montfrooij,

Only 2 variables in this,  drone in : 1) ATTI mode 2) Lost Connection to RC.

My thoughs about that are simple:
There are too many variables in ATTI mode that are untested. (software behaves different if the sensors give wrong or NO information)
So there is much risk if they give a statement about that. (since they don't test all these combinations)

Just look at the HSL and the recent update Bombardier had to make.
That was even in normal conditions.
Companies usually only test the situations that are supposed to happen when it comes to software.
Otherwise there is simply too much time needed and they rather spend that time making new products than eliminating all the possible errors that can occur...

Long story, but my guess is that DJI will never give a official statement about that.
Otherwise they would have included an ATTI button on all of their drones.  

Montfrooij Posted at 3-28 03:17
My thoughs about that are simple:
There are too many variables in ATTI mode that are untested. (software behaves different if the sensors give wrong or NO information)
So there is much risk if they give a statement about that. (since they don't test all these combinations)

i am afraid you are right about DJI not giving an answer....

But its like 1 - 0 - 1 logic. ATTI is there or not. Connection is also a Y / N.

DJI has implemented this in the SPARK, would surprise me if they have not done the same for their others types

JJB* Posted at 3-28 03:50
i am afraid you are right about DJI not giving an answer....

But its like 1 - 0 - 1 logic. ATTI is there or not. Connection is also a Y / N.

I'm not sure how familiar you are with software programming?
Something that looks simple, usually has many more consequences than you expect.
I test software on a daily basis (my own and from other programmers)
It is usually not that simple.

But then again, if DJI finds this important, they sure could!

Montfrooij Posted at 3-28 03:56
I'm not sure how familiar you are with software programming?
Something that looks simple, usually has many more consequences than you expect.
I test software on a daily basis (my own and from other programmers)

i have some knowlegde about software programming....

JJB* Posted at 3-28 03:59
i have some knowlegde about software programming....

Nice.

Wait, you were the one with the log program right?

Montfrooij Posted at 3-28 04:03
Nice.

Wait, you were the one with the log program right?

yep, FRAP is programmed by me

JJB* Posted at 3-28 04:19
yep, FRAP is programmed by me

Then you know how that works!

Montfrooij Posted at 3-28 04:25
Then you know how that works!

yeah, 20-80 rule ; 20% is simple (it works), 80% for exceptions.....(&!@#$&!#^$)  

JJB* Posted at 3-28 04:31
yeah, 20-80 rule ; 20% is simple (it works), 80% for exceptions.....(&!@#$&!#^$)

Hahahahahaha.
Very much like that.
Wait for a real user to test it.....

Montfrooij Posted at 3-28 04:35
Hahahahahaha.
Very much like that.
Wait for a real user to test it.....

and than make the money.....with all the wishes wich were not in the project plan...

JJB* Posted at 3-28 05:55
and than make the money.....with all the wishes wich were not in the project plan...

Yeah, I know.
Or the ones you did not understood correctly

Montfrooij Posted at 3-28 05:57
Yeah, I know.
Or the ones you did not understood correctly

sssttt  don`t tell them...

JJB* Posted at 3-28 06:01
sssttt  don`t tell them...

I won't   

I only know that the dji spark will not just autoland but also return to home point.
I only know what will happen to the dji spark but don't know about other drones.

Hi JJB, I will take a look on the parametrics (FW) in the MP, to see if I can find the behaviour on ATTI lost connection.
Cheers
Jos

MavSpa_user Posted at 4-3 23:17
Hi JJB, I will take a look on the parametrics (FW) in the MP, to see if I can find the behaviour on ATTI lost connection.
Cheers
Jos

thanks,  i try to fly in my house (in ATTI) with my MA. No problem.
But i have to secure MA when switching the RC off.....

I managed just about, seems that after some seconds starts to autoland, but have to to it more in a controlled way

cheers
JJB

JJB* Posted at 3-28 04:31
yeah, 20-80 rule ; 20% is simple (it works), 80% for exceptions.....(&!@#$&!#^$)

Hadn't heard of 20-80 rule with 20% is simple.  One I heard was 80/20 rule.  Going something like this...

You can satisfy 80% of your customers with only 20% investment in resources (time / costs).
To satisfy remaining 20% of your customers requires additional 80% investment.

Leading those advised by bean-counters to forget the 20%.  

For MP/spark I found in firmware:
g_config_fail_safe_rc_lost_action_time        3
g_config_mode_wifi_rc_cfg_rc_lost_action_time        20

I know when you are in GPS and lost connection, 3 seconds it's start to iniate fail safe and go in RTH.
Maybe the other one 20 seconds is in ATTI /landing???

MavSpa_user Posted at 4-4 07:15
For MP/spark I found in firmware:
g_config_fail_safe_rc_lost_action_time        3
g_config_mode_wifi_rc_cfg_rc_lost_action_time        20

can you connect a MP only to a mobile device?
Looks like this value is a general value used when connected to a mob device only

Yes you can, a switch  on the mavic.
Here you can find the parametrics
https://dji.retroroms.info/howto/parameterindex