Supported 3G/4G USB dongle

Sinamics

flyingw Can anyone suggest a method for achieving two-way communications when the LTE internet provider only gives a private IP address (like 10.192.144.68)? I can reach my GCS from the drone, but I cannot send mavlink commands to the drone.

Any ideas? Thanks, Paul

Hi
You dont need public IP for you RPI as long as you are using UDP, but you will need to port forward video and telemetry on your GCS. Changing APN will normally solve the issue of having Privat IP.
Have you tried using other APN`s?

flyingw

Bernt,
I tried another APN without result; the AT&T IoT device seems to be tied to their IoT network. I have port forwarding turned on for both the video and telemetry UDP ports. I can get streaming video at about 800Kb/s and receive telemetry, but I cannot send commands - I have a servo set up to tilt the camera but the "High/Low" command times out in Mission Planner. I still have related questions with the AT&T IoT support group that I hope to get resolved soon. I'm happy with the progress. Thanks for your groundbreaking work in this area.
Paul

flyingw

Got it working - and bi-directionally! Both telemetry and video using UDP. So far had one short but successful LTE-connected flight.
Need to make a better installation on the aircraft as the test setup had the LTE modem and antennas literally taped on.
Thanks all for your help. I'll advise with any additional learnings.
Be well,
Paul

flyingw

I'm confused by how much data I am using for streaming video. When I configure the raspivid command's -b bandwidth argument with 1,000,000, does that means one megabit per second or one megabyte per second?

Update: Raspivid is in megabits per second. Data plans come in gigabytes. 1 gigabyte is 8 gigabits. Divide gigabits quantity by megabits video rate to calculate how long it lasts.

In one flight the LTE was "on the air" for 159 seconds. My raspivid was set for 1,500,000 bits per second. The flight consumed about 36 megabytes from my data plan. This means that the system used about 1.8 megabits per second. I suppose that Mavlink at 115,200 baud plus various overheads account for the amount over 1.5 megabits used for video.

Reduced the bps in the raspivid command so it uses 1.0Mb/s. The video is still satisfactory, and now I'm using about 7.8MB per minute towards my data plan.

Thanks,
Paul

mocart

flyingw Hey Paul. What resolution and bitrate are you currently using for getreamer feed?
Just asking becuse I`m curious how others finally setup those valuses.

flyingw

mocart

Mocart,

I am currently having best results with the following video specs:

Width = 1024
Height = 768
FPS = 24
Bitrate = 1Mb/s

I can easily use 2Mb/s, 30FPS, 1600/1200 with Wifi as it gets more bandwidth than LTE.

Paul

proff

hello guys I'm trying to setup a pi zero with a 3276 huawei modem ( I took a megafon M150 on ebay witch is a huawei chip inside I checked it with ATI command)
but unfortunatly on pi I got no tty detected ... dmesg report only displays new TF card / cdrom and other mass storage devices . with a windows PC an few hours of work I tried to switch it up on modem only trought AT command ant it looks to works but only on windows and if I dont remove the bulky "megafon" modem tool that I dont want
on pi it stays only on mass storage devices
I tried to configure usb_modeswitch but I didnt succed as I have not both modem and mass storage but only mass storage
any idea ?

thank's for any help

pacertracer

Does anyone know if any of the above mentioned cards actually support LTE or 4G when used with US Cell carriers. As rma153 pointed out many of these cards drop to 3G and 2G service like the majority of Huawei's I've tested which only seem to work with Tmobile 2G in the US. If someone knows can could help me figure this out, that would be much appreciated!

Sinamics

@Chuckster1 @rma153

pacertracer Does anyone know if any of the above mentioned cards actually support LTE or 4G when used with US Cell carriers. As rma153 pointed out many of these cards drop to 3G and 2G service like the majority of Huawei's I've tested which only seem to work with Tmobile 2G in the US. If someone knows can could help me figure this out, that would be much appreciated!

rma153

My 341U Netgear modems work on Sprint's LTE/4G network, mostly at 4G speeds.

All US carrier 4G networks, by design, will fall back to 3G and even 2G in those locations where their 4G coverage is spotty.
Interestingly, I also work with international carriers ,when I am out of the country. Some of these carriers started building their networks later, using 4G only, so, no fallback on their networks (Reliance Jio, for example).

edward962

mocart
I am from Poland too, could u give me ur mail or FB to contact i porozmawiać na ten temat? 🙂

mocart

edward962 Answer for your qustion.
Test of dual modem configuration. Modems were swipped manually and please do remember it`s only ground test and I do not khow how dual modem configuration can work in real eg. flight when gsm signal can drop-down.
I do not know how to force to send communication thru modem with better signal level.

https://youtu.be/bs4hEXKADTY

mocart

Small update related cheap Huawei modems and RPI3/Pi0w Jessie edition:
Huawei E3372h - works out of box as hi-link modem ( it available as a network connection )
Huawei E3276 - works as a dialup broadband modem with networks manager (sudo apt-get install network-manager-gnome)

Sinamics

mocart That is pretty awesome. It would be nice to get both connected at the same time and just swop inbetween if one looses cell reception.

mocart

Sinamics One more clarification to this test. Whole test was done within one session ( casting software was run only at the beginning ). There are some pauses during this test but this was related manual modem switching. I was unable to disconnect mode and record same time. Overall it shows that even we change ip address on streamer device communication is still alive in the case of qground control.
This is something new for me also because I was thinking that if we change IP telemetty will lost. Reality is different it works.

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