Tello WIFI channel selection
- Thread starter raulvolador
- Start date
Hi,
For your information
...
Some weeks ago I bought an ESP8266 WIFI chip ESP8266 - Wikipedia
I can confirm it's a very interesting low-cost investment.
In my case, I am trying to use it to get Tello choosing WIFI channel that I want.
My plan is writing a little script for flooding neighbour WIFI channels with fake data, letting free only the channel I want Tello use for comunications. Once Tello make its channel decission I'll switch off ESP8266 for no WIFI disturbance.
That's my idea. I´ll keep you informed
All the best.
For your information
...Some weeks ago I bought an ESP8266 WIFI chip ESP8266 - Wikipedia
I can confirm it's a very interesting low-cost investment.
In my case, I am trying to use it to get Tello choosing WIFI channel that I want.
My plan is writing a little script for flooding neighbour WIFI channels with fake data, letting free only the channel I want Tello use for comunications. Once Tello make its channel decission I'll switch off ESP8266 for no WIFI disturbance.
That's my idea. I´ll keep you informed
All the best.
Last edited:
I just had an idea.
Parrot Bebop has a "wifi country" selector where you set the country you are in. This affects the available & preferred channels and Wifi trx power to stay within legal limits.
There is a significant difference in trx power between US and DE for the Bebop (I read around 7x the power but never bothered to check).
Tello has e region setting, too. I don't know what its used for, but I read out mine and it's correctly set to "DE". So it has been set, I guess during initial setup with the stock app. I doubt that Tello has to crop the trx power to be legal, but at least the wifi channel selection could be affected.
I have yet to check which command set the region.
Parrot Bebop has a "wifi country" selector where you set the country you are in. This affects the available & preferred channels and Wifi trx power to stay within legal limits.
There is a significant difference in trx power between US and DE for the Bebop (I read around 7x the power but never bothered to check).
Tello has e region setting, too. I don't know what its used for, but I read out mine and it's correctly set to "DE". So it has been set, I guess during initial setup with the stock app. I doubt that Tello has to crop the trx power to be legal, but at least the wifi channel selection could be affected.
I have yet to check which command set the region.
GREAT idea @volate!lo playing with region setting.
As you know, allowable WIFI channels changes depending on the country. USA wifi channels go from one to eleven, rest of the world includes channel 12 and 13 and Japan can use special channel 14. As more exotic the channel used by Tello, better the transmission will be
Problem is I have no idea about how to change region setting. Can you give us any clue ?
Thanks a lot.
raul
I suppose it is somehow set when you connect to the drone for the first time. The Ryze Tello App will just pick the region you are currently in.
If I find the time I can look into the data exchange during installation.
If I find the time I can look into the data exchange during installation.
Hi,
I got it !
I have achieved Tello starting in desired WIFI channel or nearby. Let me explain my method:
First, you need to take a look this hacking project spacehuhn/esp8266_deauther As you can read, its based into esp8266 WIFI chip and focused on "Scan for WiFi devices, block selected connections, create dozens of networks and confuse WiFi scanners". We don't want bothering anyone, just create some fake networks and forcing tello to choose a free WIFI channel.
I bought one of recomended pre-build Deauther board at Maltronics web store. I choose the simplest and cheapest, It seems a common USB stick: WiFi Deauther USB
As soon as you feed Deauther Stick using a powerbank it starts working autonomously, but if you plan to program it you will need plugging it into a computer/smartphone USB port and opening a serial communication window. Here a typical session:
Typing command "add ssids x -cl 9" you prepare 9 fake wifi networks called "x" at channels one to nine
After that, typing "attack beacon" fake networks creation starts.
At the end, "stop all" quits.
For simplicity I wrote a simple auto-executable script autostart.txt that automatically starts as soon as you plug Deauther Stick into a powerbank:
And here you can see how it works. Notice fake "x" WIFI networks at one to nine channel:
Now, switching on Tello he refuses connect those busy low channels, in this case Tello chooses channel nine. After switching off Deauther Stick you will get something like this:
We got it !. As you know, if we were not using WIFI deauther Tello would have choosen one of the first free channels, surely channel three or four.
Now we only need turning this experiment into something more practical, but at least it has proven that the concept is valid.
Take into account is not a perfect tool. Sometimes it fails. I suposse "fake wifis" are not simultaneously created and sometimes Tello see a free channel "gap" spoiling the whole process.
I hope it helps.
raul
----
I got it !
I have achieved Tello starting in desired WIFI channel or nearby. Let me explain my method:
First, you need to take a look this hacking project spacehuhn/esp8266_deauther As you can read, its based into esp8266 WIFI chip and focused on "Scan for WiFi devices, block selected connections, create dozens of networks and confuse WiFi scanners". We don't want bothering anyone, just create some fake networks and forcing tello to choose a free WIFI channel.
I bought one of recomended pre-build Deauther board at Maltronics web store. I choose the simplest and cheapest, It seems a common USB stick: WiFi Deauther USB
As soon as you feed Deauther Stick using a powerbank it starts working autonomously, but if you plan to program it you will need plugging it into a computer/smartphone USB port and opening a serial communication window. Here a typical session:
Typing command "add ssids x -cl 9" you prepare 9 fake wifi networks called "x" at channels one to nine
After that, typing "attack beacon" fake networks creation starts.
At the end, "stop all" quits.
For simplicity I wrote a simple auto-executable script autostart.txt that automatically starts as soon as you plug Deauther Stick into a powerbank:
Code:
stopap
set beaconChannel true
attack beaconAnd here you can see how it works. Notice fake "x" WIFI networks at one to nine channel:
Now, switching on Tello he refuses connect those busy low channels, in this case Tello chooses channel nine. After switching off Deauther Stick you will get something like this:
We got it !. As you know, if we were not using WIFI deauther Tello would have choosen one of the first free channels, surely channel three or four.
Now we only need turning this experiment into something more practical, but at least it has proven that the concept is valid.
Take into account is not a perfect tool. Sometimes it fails. I suposse "fake wifis" are not simultaneously created and sometimes Tello see a free channel "gap" spoiling the whole process.
I hope it helps.
raul
----
Could you elaborate on the X Nano Youth router? It's not portable is it? Do you use it for around home? I think it's discontinued as I couldn't find information about it.
If you are interested I found this article on Tello's Marvell WiFi chip.
Marvell Helps to Bring HD Video Capabilities to New Entry-Level Drone - Marvell - Blog
The MARVELL 88w8801 WiFi control chip, 1M FlashROM integrated and 512K RAM, supports the 802.11n wireless protocol in the 2.4Ghz
Marvell Helps to Bring HD Video Capabilities to New Entry-Level Drone - Marvell - Blog
The MARVELL 88w8801 WiFi control chip, 1M FlashROM integrated and 512K RAM, supports the 802.11n wireless protocol in the 2.4Ghz
I understand what you say, but believe me I'm not doing too much! I just wanted to report this information to the forum that maybe someone might be interested in.
For the distance, Porto Tello over 300 meters without problems, thanks to the extension with a parabola.
I understand that for many this drone is just a toy, but I don't see it that way ... without offense it's just my thought.
This was the only modification made to Tello to improve the cooling of two important components.
system overheating on landing
ok guys....I did not read the entire thread so bear with me as I share so hopefully useful real world experience.....mainly with a Spark.
im in USA and a very rural area
if I fly toward town my range drops....I believe the homes with routers interfering.
if I fly away over Forrest and farm land....oh my...1.2 to 1.4 is common....by stick or litchi
forget 5.8..here......
use 2.4....prefer to lock on Chanel...but still ok if it scans 2:4
very little WiFi over the farm and Forrest land.
I have a Titan command case that we are about to use with the P4 and spark.....
to do any thing more than educated guess work you need a 2.4 ghz spectrum analyzer....
im not talking about the app based analyzers......they just show the tip of the iceberg.....
RC immersion has a mini spectrum analyzer for Fpv racers that is far from communications grade but has use....it’s about a hundred bucks.....I have one and am waiting to calibrate it with a communications grade analyzer .....
it can tell you a lot.....
part 2 is your antenna......if it is not matched impedance wise....any power coming from controller or booster is to some degree bounced back into the controller.....that burns up the finals in your controller......and in my opinion a lot of the cheap amplifiers sold burn up fast because of this mismatch.....
you need to tune the antenna to match the controller.....that’s not guess work.....you need some device to measure the mismatch , reflected back to controller power ....
some people call these SWR meters....
I welcome those of you who have some experience with such equipment in a 2.4 or 5.8 real world environment to help bring me up to speed.
most of my communications background was at HF vhf and uhf frequency’s....
This isn’t ment to discourage anyone....it’s ment to encourage using proven instruments to fine tune our birds.
im in USA and a very rural area
if I fly toward town my range drops....I believe the homes with routers interfering.
if I fly away over Forrest and farm land....oh my...1.2 to 1.4 is common....by stick or litchi
forget 5.8..here......
use 2.4....prefer to lock on Chanel...but still ok if it scans 2:4
very little WiFi over the farm and Forrest land.
I have a Titan command case that we are about to use with the P4 and spark.....
to do any thing more than educated guess work you need a 2.4 ghz spectrum analyzer....
im not talking about the app based analyzers......they just show the tip of the iceberg.....
RC immersion has a mini spectrum analyzer for Fpv racers that is far from communications grade but has use....it’s about a hundred bucks.....I have one and am waiting to calibrate it with a communications grade analyzer .....
it can tell you a lot.....
part 2 is your antenna......if it is not matched impedance wise....any power coming from controller or booster is to some degree bounced back into the controller.....that burns up the finals in your controller......and in my opinion a lot of the cheap amplifiers sold burn up fast because of this mismatch.....
you need to tune the antenna to match the controller.....that’s not guess work.....you need some device to measure the mismatch , reflected back to controller power ....
some people call these SWR meters....
I welcome those of you who have some experience with such equipment in a 2.4 or 5.8 real world environment to help bring me up to speed.
most of my communications background was at HF vhf and uhf frequency’s....
This isn’t ment to discourage anyone....it’s ment to encourage using proven instruments to fine tune our birds.
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