Implementation of Network Coding in an ad-hoc android network

[bengal....@gmail.com]

Hello,

As part of our final project (B.sc electrical engineering, BGU Israel), my colleague and I are currently searching for a way to implement a dynamic ad-hoc network on android devices. We have come across your project which is quite impressive.

Our project's purpose is to increase the throughput over the network using Network coding (http://en.wikipedia.org/wiki/Linear_network_coding). previous projects implemented on simple networks (peer-to-peer through relay) have proved to increase the throughput dramatically. 

Is the serval project open source? We would very much like to learn from your infrastructure and perhaps use it as a basis to our implementation.

Lots of respect for the work done so far,

Thanks,

Gal Paikin.

[Jeremy Lakeman]

Getting a true adhoc network running on android is difficult.
Firstly it's unlikely that you'll manage to get adhoc working at all on any android 4.0+ devices. On earlier versions of android we have had some success on various models of phones.
We've had a fair amount of success on the devices we've had physical access to but we can't guarantee that getting adhoc working will be possible on every android 2.x device.

That said, the core of our routing daemon can run on just about any linux hardware. We compile and test on linux, Mac OSX and sometimes solaris. So for example, you could build a mesh network of cheap openwrt routers, running both adhoc and access point network interfaces. With android devices connected to the AP's.

All of our source code is available on github under a GPL license;
https://github.com/servalproject/serval-dna
https://github.com/servalproject/batphone

We have recently started experimenting with network coding as well. I've started building some rudimentary network coding for the unicast 915Mhz radio's we using for longer range communications. And I also plan to include network coding in a TCP-like connected unicast stream.

The core of our software stack replaces the traditional OSI networking stack. Using 1-hop unicast or broadcast UDP packets, or other radio links, as a link layer between nodes running our daemon. All packet routing and network addressing is handled by our software. We don't modify the underlying IP network routes at all.

While there are many aspects of our current implementation that could be improved, I think our solution could be a very interesting platform for further research.

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[bengal....@gmail.com]

Hey Jeremy,

Our main goal is to show a proof of concept regarding network coding algorithm. We want to show it based upon a dynamic ad-hoc android network.

Our thought was to use the serval infrastructure and to implement ourselves the network coding part.

From your understanding of the Serval project, do you think it can supply us the infrastructure we need? [ Our network is going to be a small 4-6 devices, with a network coding algorithm working only on one connection ]

[ Our plan is to edit packet headers and data using C language ]

Thanks a lot for your help,

Gal

Ben Gurion University of the Negev,

Department of Computers and Electrical engineering.

בתאריך יום שישי, 8 בנובמבר 2013 14:05:03 UTC+2, מאת Jeremy Lakeman:

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[Jeremy Lakeman]

Yeah, it should be fairly straight-forward to cut out some of the link layer packet handling from our code and replace it with something else.

It's mainly the "ad-hoc network on android" part of this solution that can be difficult to get working. Some phones we can deal with already and will work provided they are rooted. Some phones may be possible to get working with only minor tweaking, and we'd be happy to help if we can. Some are going to be impossible without building your own kernel and custom android rom.

And then you may run into wifi compatibility issues between different pairs of devices.

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[Dan Staples]

I'd also recommend checking out Martin Hundebøll's work on implementing
network coding within the BATMAN-Adv mesh protocol. He presented on it
at this past year's BattleMesh gathering and it was quite interesting.

https://www.google.com/search?q=Martin+Hundeb%C3%B8ll+network+coding

> https://github.com/__servalproject/serval-dna
> <https://github.com/servalproject/serval-dna>
> https://github.com/__servalproject/batphone

> <https://github.com/servalproject/batphone>
>
> We have recently started experimenting with network coding as
> well. I've started building some rudimentary network coding for
> the unicast 915Mhz radio's we using for longer range
> communications. And I also plan to include network coding in a
> TCP-like connected unicast stream.
>
> The core of our software stack replaces the traditional OSI
> networking stack. Using 1-hop unicast or broadcast UDP packets,
> or other radio links, as a link layer between nodes running our
> daemon. All packet routing and network addressing is handled by
> our software. We don't modify the underlying IP network routes
> at all.
>
> While there are many aspects of our current implementation that
> could be improved, I think our solution could be a very
> interesting platform for further research.
>
>
>
>
>
> On Fri, Nov 8, 2013 at 9:03 PM, <bengal....@gmail.com> wrote:
>
> Hello,
> As part of our final project (B.sc electrical engineering,
> BGU Israel), my colleague and I are currently searching for
> a way to implement a dynamic ad-hoc network on android
> devices. We have come across your project which is quite
> impressive.
>
> Our project's purpose is to increase the throughput over the
> network using Network coding

> (http://en.wikipedia.org/wiki/__Linear_network_coding
> <http://en.wikipedia.org/wiki/Linear_network_coding>).

> previous projects implemented on simple networks
> (peer-to-peer through relay) have proved to increase the
> throughput dramatically.
>
> Is the serval project open source? We would very much like
> to learn from your infrastructure and perhaps use it as a
> basis to our implementation.
>
> Lots of respect for the work done so far,
> Thanks,
> Gal Paikin.
>
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[Jeremy Lakeman]

We've got some documentation on our current network packet format here;
http://developer.servalproject.org/dokuwiki/doku.php?id=content:tech:overlay_network
http://developer.servalproject.org/dokuwiki/doku.php?id=content:tech:mdp

We start parsing incoming packets in packetOkOverlay();
https://github.com/servalproject/serval-dna/blob/development/overlay_packetformats.c#L326

You could add a new packet version and encapsulation so that your new packets can co-exist with the existing packet formats while you are experimenting.

We start assembling an outgoing packet from our QoS packet queues in overlay_send_packet();
https://github.com/servalproject/serval-dna/blob/development/overlay_queue.c#L528

[JUGAL SHAH]

hello

I am too trying to create an adhoc network in android 

my project is to setup an adhoc network and use it for sending short sms 

I have gone through the net and found various implementation but couldn't get them running

Their is video too of one of the student from same BGU unversity who has implemented adhoc in mobile

can you please provide me some guidance 

thank you for any help

[Paul Gardner-Stephen]

Hello,

This simply works with the latest Alpha version of Serval Mesh from Google Play. There is nothing more that you need to do than to install it, enable Mesh Services in the App, and enable BlueTooth.

Paul.

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[JUGAL SHAH]

Thank you Paul for the reply

I have still some questions

 I downloaded the serval mesh software from google play

1) when pressing on connect button it provides me with the options of wifi ,wifi hotspot and adhoc

    if I use wifi then I need to connect to a  wireless router and the user must be on same network with whom I want to commuicate but during disaster router may not be available    also I wont be able to send a message to a person out of range of network. Wifi hotspot too has its range limit like wifi.

2) I also installed serval mesh on 2 rooted phones and used ad-hoc mode the testing was successful but still it shows 0 peers that is not detecting other handset.

    I read the issue of adhoc wifi not supported by google. With adhoc wifi will it be possible to implement a working adhoc. 

 

3) I read another paper "Digital Telegram: A fully distributed, infrastructure-independent SMS capability for the Serval mesh telephony platform" supervised by you. In the implementation part of the paper a link is given for installing batphone-sms apk (consisting of the connector for websms within it) can you exactly specify which apk i need to install which has connector for websms.

Thank you for all the help

On Thursday, March 10, 2016 at 3:01:20 AM UTC+5:30, Paul Gardner-Stephen wrote:

Hello,

This simply works with the latest Alpha version of Serval Mesh from Google Play. There is nothing more that you need to do than to install it, enable Mesh Services in the App, and enable BlueTooth.

Paul.

On Thu, Mar 10, 2016 at 6:41 AM, JUGAL SHAH <shah.j...@gmail.com> wrote:

hello

I am too trying to create an adhoc network in android 

my project is to setup an adhoc network and use it for sending short sms 

I have gone through the net and found various implementation but couldn't get them running

Their is video too of one of the student from same BGU unversity who has implemented adhoc in mobile

can you please provide me some guidance 

thank you for any help

On Friday, November 8, 2013 at 4:03:27 PM UTC+5:30, bengal....@gmail.com wrote:

Hello,

As part of our final project (B.sc electrical engineering, BGU Israel), my colleague and I are currently searching for a way to implement a dynamic ad-hoc network on android devices. We have come across your project which is quite impressive.

Our project's purpose is to increase the throughput over the network using Network coding (http://en.wikipedia.org/wiki/Linear_network_coding). previous projects implemented on simple networks (peer-to-peer through relay) have proved to increase the throughput dramatically. 

Is the serval project open source? We would very much like to learn from your infrastructure and perhaps use it as a basis to our implementation.

Lots of respect for the work done so far,

Thanks,

Gal Paikin.

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[john whelan]

From a practical point of view you either need to use the mesh extenders to provide a meshed wifi network or I'd suggest running Astrisk on a lap top connected to a Commotion mesh network.  There in a some configuration required but FreePBX minimises this.  I'd didn't manage to configure text messaging through Astrisk but it is possible.  There has been some work using Serval with Astisk apparently.

One of the problems is that wifi works better with an antenna and smart phones don't have very large ones.

I really ought to dig out one of the laptops and drop Linux on it so I can build a couple of mesh extenders.  I have the hardware lying around.

Cheerio John

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[JUGAL SHAH]

so without specific hardware it wont be possible to send sms to someone out of my network but connected to one person present in my network?

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[john whelan]

Currently Android 4 and above do not support direct peer to peer communication so you can't build a pure mesh network just with smart phones running Android using wifi.  Google in their wisdom may change this.

Apple devices however do support direct peer to peer communication but are more difficult to work with.

The mesh extenders are fairly cheap and small but the TP-link MR3020 doesn't have enough memory so you need to add a USB stick and currently you apparently need a Linux box to flash them.  Also TP-Link in response to an FCC request relating to 5 gigahertz are now blocking flashing on many of their routers.

To get anything out of the local mesh network including an SMS message you need some sort of gateway Astrisk is often used but it does need connections and configuring.

I'm not the specialist here and these are my personal views.  I'd think in terms of a DVD that could install something on a machine such as a laptop together with some sort of mesh network.

You need to think in terms of a complete system, you need to think of what are the requirements, sending a file it not an obvious one until you think I want to send a photograph.

Cheerio John

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[JUGAL SHAH]

thank you 

so android below 4 support direct peer to peer

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[Paul Gardner-Stephen]

Hello,

For (1): You have to tell Google Play you wish to sign up for testing of Serval Mesh, then you can select the latest ALPHA build, which includes BlueTooth as a transport.

For (2): Adhoc on rooted Android phones is really only relevant for phones built before about 2012, as after that Google made it REALLY hard to use WiFi in ad-hoc mode.

For (3): MeshMS has been built into all Serval Mesh builds for years now. It is the "Messaging" feature.

Paul.

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[JUGAL SHAH]

for(1): can you give me link of latest alpha build . In the app I installed from google play I am not able to find anything about bluetooth.

for(2): can you provide some details of implementing  adhoc for phones built before 2012.

for(3): I read the paper and followed its installation step but counldn't find Digital datagram connector in websms 

Thank you Paul and John for all the replies

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[john whelan]

It might be 2.1 that allowed rooting which allowed it?  but the most common versions these days are 4 and above and they certainly don't.

Cheerio John

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[Paul Gardner-Stephen]

Hello,

Yes, but only for handsets that we are able to support, which is not all of them.

Paul.

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[Paul Gardner-Stephen]

On Fri, Mar 11, 2016 at 2:25 AM, JUGAL SHAH <shah.j...@gmail.com> wrote:

for(1): can you give me link of latest alpha build . In the app I installed from google play I am not able to find anything about bluetooth.

On Google Play, sign up for testing of the Serval Mesh app, and it will give you access to the alpha build.

 

for(2): can you provide some details of implementing  adhoc for phones built before 2012.

If you use a Samsung Galaxy S2 or Huawei U8180 or U8150, root it, and hit the "ad-hoc" button in Serval, it should just work.

 

for(3): I read the paper and followed its installation step but counldn't find Digital datagram connector in websms

I'm not sure what you are aiming to do here? SMS-like messages between devices on a mesh, or connect a mesh to the outside SMS world?

Paul.

 

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[Paul Gardner-Stephen]

Rooting isn't the problem. It is that Google castrated ad-hoc wifi support out of the kernel in later versions of Android.

Paul.

[Jeremy Lakeman]

You can manually download and sideload our alpha builds, the latest one is here;

http://developer.servalproject.org/files/alpha/Serval_Mesh-0.93-pre-55-g427a828.apk

Instructions for getting the latest alpha from google can be found here;

http://developer.servalproject.org/dokuwiki/doku.php?id=content:servalmesh:development

Note that google do make available raw stats about the number of installs, with things like which country you are in.

They also capture stack traces from any crash, which can help us to quickly fix major issues.

Text messaging is built into the apk and doesn't require any 3rd party plugins.

You should join a network with the people you wish to contact and add them to your phone book.

Then you can send them text messages at any time. Your messages will be shared by everyone who is running our software, until they can be delivered.

We do have plans for spreading business cards or contact lists so that you can start to communicate with someone without needing to meet with them in person.

[JUGAL SHAH]

Paul

1) I aim to send short messages between devices on a mesh, which is possible by running serval mesh using wifi mode 

   and I also want to send short messages to a device that is not directly connected to my network.

2) Just an idea if we had the same type of packages( if possible can you provide those pacakages) of android 2.1 and then flash the same packages from the boot-loader into the recovery and mount those packages from the android terminal , then would it be possible to run the serval mesh to run the ad-hoc type connection 

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[JUGAL SHAH]

hello Jeremy 

thanks for the links will check it

and yes I know messaging is inbuild in to servel mesh but I wish to implement the project "Digital Telegram: A fully distributed, infrastructure-independent SMS capability for the Serval mesh telephony platform "  the project was supervised by paul .In this sms were send websms and sms droid and sms branch version of batphone was used to provide the connector for web sms

On Friday, March 11, 2016 at 4:52:02 AM UTC+5:30, Jeremy Lakeman wrote:

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[Jeremy Lakeman]

While I don't know why you are attempting to do this, I believe that the student who performed this work uploaded his branch of baphone here;
https://github.com/Thomas-Giraud/batphone/commits/sms

As you can see, that's a very old version of our application.

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[arch...@somaiya.edu]

hello ,
I am currently working on project to create Ad Hoc network on android phones.
i also downloaded the serval mesh app from google play, but it is not supporting the Ad Hoc mode.
i read all previous post i come to know that it requires some hardware , so can you specify the hardware requirements that will be needed and how to setup?

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[JUGAL SHAH]

hello paul

I wish to create a peer to peer network in android using which people in the

 network can send sms to each other even if they are not directly connected to each other

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[arch...@somaiya.edu]

hello
Can you name the devices that supports the Ad hoc mode?

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[Paul Gardner-Stephen]

Hello,

Only very few phones support ad-hoc mode. You should instead use the alpha pre-release of Serval Mesh 0.93 which is available via the sign up for testing mechanism on Google Play. That version can use BlueTooth instead of requiring ad-hoc WiFi.

Paul.

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[Jeremy Lakeman]

http://www.thinktube.com/android-tech/46-android-wifi-ibss

[arch...@somaiya.edu]

hi
thanks for the reply
the issue regarding the Bluetooth is that Bluetooth wont provide me the range.
and it wont be a multi hop network.
and i required the hardware specification and setup for implementing Ad Hoc on android device.

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[arch...@somaiya.edu]

hello Jeremy
thank you for the link
It provides cyanogen only for nexus devices.
i also referred the link given below

http://szym.net/2010/12/adhoc-wifi-in-android/

Can you give some sggestion on this?

http://www.thinktube.com/android-tech/46-android-wifi-ibss

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[Paul Gardner-Stephen]

Also, BlueTooth in Serval DOES do multi-hop.

Paul.

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[JUGAL SHAH]

Hello Jeremy 

Thank you for the link

referring it I got 2 phone with cyanogen 12 android lollipop

under settings->wifi->add network->advanced network

their is Adhoc IBSS mode 

but it does not create an adhoc network

on "adding network"  the network  just comes under "saved network" tag

how do i create and join adhoc network?

Thank you for any help

On Friday, March 18, 2016 at 2:08:12 PM UTC+5:30, Jeremy Lakeman wrote:

http://www.thinktube.com/android-tech/46-android-wifi-ibss

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[JUGAL SHAH]

hello paul do I need to root my phone for using alpha builds bluetooth option?

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[Paul Gardner-Stephen]

No, this is exactly the point, that it works with unrooted, unmodified, off-the-shelf Android phones.

Paul.

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[JUGAL SHAH]

hello

I have got 2 phones in which their is adhoc network option under show advanced network->add a network->Wifi

how do I create adhoc network using this adhoc feature

Thank you for all the replies

 

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[john whelan]

My understanding is you can do this with bluetooth or a wifi hub of some sort.  Two normal Android phones running Android later than 2.2 are not able to work on wifi without something else such as a router being present.

Cheerio John

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[JUGAL SHAH]

But then why the provided this feature their may be some use of it know

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[john whelan]

Because in the beginning with Android 2.2 and lower it could be used.  It's when Google played that it could no longer be used.

John

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