Posts made by groupo

@bendraper One idea I had is to change the bands of the modem so that it will only search for signals on specific 5G bands. I did this with my modem for LTE B3 through the use at AT commands. I linked a post where I provided a way to use these commands on the drone

https://forum.modalai.com/topic/3738/monitor-sierra-wireless-5g-signal/11

I would go to Sierra Wireless website and download the AT command reference guide to understand how to use them. there are probably some other commands that could help you too, but the BAND one sticks out to me. Sierra also has a really good forum I would recommend.

@tom , this is the 3rd/4th I've linked the AT commands post to forum users. Is there any expected AT command support for the EM9291 like with previous modems? It is a functional workaround, but could save people a lot of time/trouble if it was available upfront. It really 'unlocks' the modem for more configurability, don't you think?

@buem799 Hi, no worries, I am also very new to this space. ffplay is separate thing, part of the ffmpeg program, not something inside VLC. This is the reddit link that I posted in the thread I listed above

https://www.reddit.com/r/reolink/comments/yzhlxp/found_a_solution_for_rtsp_blackno_video_in_vlc/#:~:text=In VLC%2C under the Tools,video stream in VLC player

If you read through it, the fix was for a windows machine, which I was using at the time. It states further down in the reddit post that live555 support was removed in newer versions of ubuntu (linux operating system). From your screenshots, it looks like you are using ubuntu, so it could make sense that VLC may not work. I believe it is more a ubuntu issue rather than VLC. Don't try to dig into that, especially if you are new to linux. I would install ffmpeg on your system and try to access the RTSP stream using that. I just asked ChatGPT for the commands to do that and will paste below:

sudo apt install ffmpeg

Id recommend asking Chat how to access an RTSP stream using ffplay, or read the documentation

The other thing you could do, if you had a windows laptop, you could connect the windows laptop to the drone wifi and try to access the RTSP stream via VLC on windows and do the fix included in the reddit link

@Eric-Katzfey @buem799

@buem799 I had some RTSP VLC struggles a while back. Check out the link I posted at the bottom of this post here

https://forum.modalai.com/post/19409

@RSAUser1 yeah i'd probably pass to @tom . The modem is seems connected, otherwise you wouldnt see wwan0 come up. Once I had access to AT commands I ditched QMI which I think is more or less a wrapper for those commands anyway.

@RSAUser1 glad its working! You can use AT commands to confirm you can 'see' your network too

@RSAUser1 you should not need to download any drivers to do the steps I listed, in fact I almost advise against it unless you know what you're doing. I certainly didn't and still don't. I found my workaround much easier. The idea of outdated drivers is a theory I have, but modalAI never confirmed if that was the case. Probably @tom or Travis could speak more to that

@RSAUser1 That is interesting. No, I don't think so. Here is something that got me. You have to unscrew the modem board to put the SIM in on the underbelly. Did you screw it back on fully? I had not and it took embarrassingly long to realize (Tom told me). Make you you screw it back down so it connects properly. I don't see your WIFI dongle either (if you have one). That also would be knocked offline if the modem board wasnt connected properly (at least for me that was the case)

@tom Any idea when AT commands to the EM9291 will be supported by VOXL SDK?

@RSAUser1 you may want to query the modem more directly with AT commands to confirm it can 1) see your BTS 2) is able to connect on that band (it should be available on all bands by default but doesnt hurt to check)

ModalAI hasnt seemed to implement AT commands w/ the EM9291 yet but I posted a way to do it here

https://forum.modalai.com/post/19131

There is a reference guide on AT commands on the Sierra Wireless website. "AT+COPS=?" would probably be a good starting point

@Alex-Kushleyev Thank you for the detailed breakdown! I am fairly certain OP is from another team on the same project and I believe we are describing the same event. He has custody of the drone/logs so I will let him follow up with you

@Alex-Kushleyev how cold is "very"? Ours crashed in November, probably between 30-40 F at the time of flight. Had been flying for a few minutes

@briandaniels15 Hey Brian, our Sentinel also crashed. Our post-crash analysis revealed the same thing - the compass switched 180 degrees midflight

@soraminds im not sure there is any but we did what I believe you are describing in reverse. We set up a shell script on the drone that sent web requests to a server running on our network. This requests contained the GPS information from voxl-inspect-gps.

On our server, we set up a webserver using Perl and its HTTP::Server::Simple::CGI module. IIRC Perl was already on the drone so you might natively be able to do this in reverse, otherwise just install that package/module and look up some examples for it. That should get you there

Only catch might be the IP address changing. Depending on your network perhaps your webserver IP (running on drone) may not be static. You would have to account for that somehow. In our case, our server was static and this point was moot. Good luck!

@groupo traction?

@James-Strawson is this sensor on the sentinel as well?

I found a video on the forums from SDK 0.9 that shows how to change voxl-streamer from 720p to 4K. This video also showed changes to the bitrate and decimation. I am running SDK 1.3+ on a Sentinel and would like to similarly change resolutions. I see in the new SDK documentation that bitrate is ignored at least. Is changing the resolution the same procedure as described in the video? Will bitrate still be ignored if I adjust the resolution? Need I adjust the decimation?

@Zachary-Lowell-0 Are you talking about the USB-C used for ADB? (Maybe there is not the same on the Starling as there is on the Sentinel). Wouldn't that only apply if something was plugged in (i.e.) a cable for ADB

@Bernhard I also have had GPS related issues with my sentinel drone that happens to have a 5G modem. I have two drones and one does work so we havent chased the other one down much. I will be interested to hear what steps the team will have for you

thanks @Vinny !