[Applause]
my name is Greg from chain Save Eric
we've got Eric over here and Dean need
some status with chain safe we're going
to present to you guys something that we
worked on as a hack and realizing that
there's a lot of actual like application
to it and it's a little tree lightning
so quick outline we're just gonna kind
of like over everything and give you
guys a basically the code walkthrough we
have a full we have a sorry we do have
like a running surface TK that works but
it's it only supports bluetooth
currently in minutes a working progress
on the Wi-Fi direct if we want me to
show you guys how to integrate it
directly into like a sub tab right now
we can be like outdoors
we're gonna turn the TV music so you
know they have this slide is kind of
cheeky like this Wi-Fi a good luck
downloading Xcode so over doing the Code
walkthrough not an actual integration
but if you have Xcode we can do that's
like four games kind of like results are
like me where did it happen so we were
in New York and basically we have this
crazy idea that we were gonna transmit
offline theorem transactions over
bluetooth and Wi-Fi direct and we did it
but you know very naively put we started
working on from that and then a
dimension proceeded into
you know dude go
they were like whoa these by pnina
there's no support for Bluetooth and
these languages you know on like public
and we're like less problems and then we
realized there's no support for certain
function either bluetooth on you know
only on iPhones or Android devices so
everything we realized really quickly
that like the ecosystem itself within
Bluetooth even white button wasn't
submitted so we ended up moving more
towards a swift and because you know
basically what is ultimately we're a
transport agnostic Manning so mobile ad
hoc network for sending arbitrary data
over the wire basically what that means
is we don't really care whether you use
bluetooth whether you use Wi-Fi direct
whether you're using like you know hard
code it really doesn't matter what we're
trying to is we're trying to find a way
to actually communicate over your
networks that are we don't care about
really the topology we like we only care
about how you're transmitting data from
one period to another peer and when you
don't have a stable connection that's
like basically the idea - it's like how
can we actually make that work and how
can we do it in the future and to do so
we can actually like do kind of like
relay with your transactions and or just
any transaction really in a very
unstable environment we'll get into the
get inside show so quickly about minutes
so man refers to continues
self-configuring
infrastructure list
of mobile devices on that date let's see
that's a lot of buzzwords I have very
little interactive thing I'm going to
show you guys are not to make the
difference so it kind of sounds like a
mesh network and I want a different
different you know make the explain the
difference quite clearly so a mesh
network you can think of like a bunch of
IOT devices that don't move is your
camera movement all right probably not
your cameras like staying still and
there it's gonna be our camera you know
same apply your your toaster your
toaster probably doesn't move for that
stove that's like all connected that's a
machine or even your brother you know
those Google like little rubber modulus
like they're staying in one place and
typically not moving and they're
relaying this whatever the data is like
in a very static way do you know what
here's me a thumb and I'm gonna be there
yeah it's nice you know this is
technology that's sending that it's very
low-power
doesn't need a lot of work and can
actually like will work on this up so in
our example we are static we're not
moving we're a match but as steam starts
to move around
crystal transmitting data to oh and
somehow this camera is actually moving
or not moving so as a picture right this
can move to this
this is a mesh network and we're chance
winning today like Jane hi Jean hi hi
ping and then wait team is gonna go
through this wall where there's no
connectivity where it's still a minute
no I'm saying hi team
hi Dean he's the messages are in queue
Erik did you see my hi team you saw I
mean
oh hi team hi hi so right there you know
these messages when he comes back
because yes we have some like kind of
we've got some issues I get up two ways
that we can filter no traffic to hop
path of least amount of hops and then we
do that using like more centralized will
be layers so some needed connect talk
about that we'll get to the any
mandatory special questions just wanna
make sure we have the yeah why is this
super useful let's think about this for
a second
so this is kind of this photo drink it's
kind of when you're in yeah we're like
totally cut off we're talking like zero
internet how do you communicate with my
number you can do it
these are like non sensible tools that
our disposal you know going over data
and connecting to the carrier that sense
right because they can completion in a
large crowd all you need are a few
people with devices going and you have a
full-blown
network and where you can communicate
with somebody potential on the other
side of the world as long one person is
internet then we can be funneling all
our requests through that one person to
a bounce back outwards and you you know
you can be like two kilometres away as
long as there's people moving and
carrying these messages around kind of
like carrier pigeons you know like hey
this like flying flying flying
eventually get to their location where
they get deep it's kind of a similar
idea
oh yeah in buildings another really good
you say Smith's oh no no no like you
ever been in a building it's there's so
much concrete you just can't actually
communicate with anybody like your
phone's down like same concept you could
just keep relaying it until there's one
person with the internet and you can get
out and one of the things I wanted like
clear the differentiate hears like yes
this is to like do an offline set up but
it's also a way to actually get offline
devices to actually connect to the
internet and send them receive messages
so that's where the like power behind
this slick really becomes like a
powering for people is because you can
now like we can give Internet access
well messaging access to the Internet to
devices that could be a 50-story deep
with no actual active engine as long as
there's somebody who similarly you know
like in places that don't have access to
like get infrastructure whatsoever you
know we can this could set up like like
in like small communities of like to
talk to people so that's kind of like my
intro to kind of mesh and the useful
applications to them we have any
questions on that
because then we're gonna talk about like
the like cash flow like stack here
the merciless is like the best time to
ask about Li yes so you could yeah you
probably could run it again this just
managed some like we're using a mana
simply to help yeah yeah he's probably
key to run Cisco but yeah Eric's gonna
die if you guys deep into kind of like
what all this means and what we've done
thank you Greg yeah so this is kind of
our architectural diagram for ultralight
beam we have I'll go into each part
separately but kinda the flow is like if
you're sending and receiving information
like data comes into the transport it
goes to the node and if the node
supports like certain services of Emma
button this and if a node supports like
certain services that you know it you
know and it will process that
information if it doesn't it like
propagates back out to somebody else who
can potentially then you know in Reverse
so transports its we I'm not sure if
we're gonna stick with this name but it
transports in ultralight beam are it's
the communication protocol I guess so
that includes things like Bluetooth
Wi-Fi direct and radio but it could be
like literally anything as long as you
conform to like an interface that we
need to provide and the interface is
very simple this is what our interface
looks like you've implemented the
Englishman
sorry
that's our interface you basically have
to implement two functions
it's descent and listen function so I
mean theoretically like you can do that
for like any form of communication so
you can even do over ultra high
frequency low frequency radios if you
want to implement that so transports
they're interesting because in ultra
light beam we can support multiple
transports at the same time so if you
have a device that's Wi-Fi only you have
another device that's Bluetooth only you
have another device that's Wi-Fi and
Bluetooth the the devices that are like
only supporting one transport can also
talk to each other by going through the
second one and that makes it super
powerful so you can create like these
massive networks that are you know in
the macroscale or very short-range but
then it connects like larger other
methods perform like a huge magnetic
over like radio or something like that
currently for ultra light beam we
support bluetooth low esteem for short
distance communication which we will
definitely learn it but um soon we're
gonna focus on Wi-Fi direct and get that
working for Android and so like we can
do like a bunch of cool stuff yeah again
now we talk about services so currently
like ultra with gold with ultra beam is
to be able to like relay these generic
messages like these UV message payloads
but so services are things like we want
to make it so that ultra light being
conserved like specific application type
things as well so you want to be able to
like as grave said before the relay
transactions offline like on a plane or
something like that
maybe one guy's Wi-Fi because a rich in
the bodies are change state channel
you're gonna clean you can start the
offline state channels within like a
plane and send people money or you can
just doing chat messaging so these are
what like services are they defined like
how when these like how to handle these
messages if you're a node and nodes
don't have to support all services equal
support some services and they can't
support it they just like sent somebody
else who's on their peer list and maybe
they can support it just keeps going and
going yeah so relayer we have the
concept of relayer that's a node that
generally lives like on the edge of the
mesh network like for example like in
the like in a yeah like a festival or
something like that there is technically
like you know there is like cell signal
but it's like super bad but it might be
good for the guy who's like maybe a
little bit further out from like some
background and that guy's internet so
you know you might try something a
facebook message to your mom showing
like your party
but you can't kiss your like in the
middle of the festival so you send it
out through ultralight beam it goes like
through a bunch of people and then it
finally hits a guy who has internet and
he relays it to the internet gets Nessa
tracking this you know like tracing back
to you so yeah generally these things
like living on the edge of the network I
just said that yeah so we have Bluetooth
Low Energy right now you got it working
on Mac OS it should be fairly simple to
get it on iOS because we're using only
libraries that are core apple and
they're cross-platform we're going to do
Wi-Fi direct soon it's going to be
supported on Android and all that so
that's gonna be dope don't go don't go
to bed yeah yeah yeah so we were gonna
prepare a full workshop and then we got
here on the first day and we realized
that the Internet of and so getting
you guys to download packages and stuff
like that isn't going to work for us so
what we've decided to do is that we'll
do we'll try to do a quick demo live of
how one of the real ER works just to
show that this isn't completely
vaporware that we can actually send and
receive messages
did you guys download I figured you
would
if you guys actually have Xcode you guys
can pull a repo and join our network too
but yeah if anyone has a Mac with Xcode
an internet they could pretty much pull
and join you have any questions yes yes
I was learning about the Facebook
example so they start asking for
messages but can they actually initiate
communication in theory yeah but that's
like a lot of work dean of inland coding
this for like the last four months we've
been spending like 10% of our time 20%
because we have like eight jobs yeah you
could we made like design is that like
our rationale behind like our design is
like we made it generic enough such that
you can do whatever you want on it this
is like we just provide you you know
like a way to like just send messages
but you can definitely encrypt messages
you can probably build tcp on this you
probably build like into HTTP on that's
too probably there
yes yeah so it's like super generic
should wear girls it over yeah so going
back to your music festival example
thing so the guy on the periphery who
actually has serviced this we need to be
like running this I yeah so like
everyone involved in that chain of yeah
yes so we still have this yes of like
the the idea behind what we've done is
we're trying to make it as minimal as
possible because that way he any any app
could integrate this the protocol itself
as like a secondary pop as like a like a
layer on top of like an existing
messaging service right so this isn't
like we're making another chata this is
like hey please use this as a forum to
do your if to this is like this way to
like toggle like hey I want to like use
the offline mode so your existing like
Java that's kind of like the design idea
so in theory if you went into that mode
you could essentially receive messages
from other apps that support you friend
so you can have your own the same
interface like what in theory if you
know Facebook would ever adopt it you
know theory like whatsapp can
communicate with like messenger on an
offline yes
you know so you can do whatever you want
to the payload right so the message
itself we don't define how do we don't
we don't define no you do to the message
but you can encrypt it however you would
choose to to ensure that like we want to
be as less intrusive as least intrusive
as possible so you can do whatever one
that you couldn't repetition easiest is
yes just how do you so now you believe
we have this thing called the gossip
right now which is doing that we're
working Dean's been doing a lot of
research with Oscar Oscar on better
routing paths so that we can do more
efficient hops and I actually like have
less hops throughout the network itself
the problem though is that typically
what you would in a festival is a little
bit different festivals there's not
people are typically standing still so
we can actually benefit from the fact
that you know I can assume that the
device would probably last more than a
minute and roughly you know like a 5
meter radius but in a busier crowd
things get a little complicated because
what ends up happening is you have
people moving from like you can assume
like we only have connectivity for like
maybe 10 seconds before now the peer
list might be changing and drastically
changing so we have to find as a way to
do an efficient like one like a DHT
wouldn't work here because like it would
be so aggressively updating all the time
that doesn't work so you have to
maintain like a really close peerless
and finally better running hats that's
what I'm working on but if you have to
stop see yeah that's right like there's
only one guy
access to yep otherwise how do I know
the roots gets him like I look for
customized in magnets you don't know
roots yeah that's a penalty
so measurements have the efficiency that
you can pre calculate roofs and magnets
because we assume very short
liveness of things or very short
lightness of the peers we can
predetermine roofs so there are certain
ways to for every health pick the next
best by acquiring their peers right
before the hall but like if there is
like 50 people between you and the
internet you can do that right so I cast
like potentially to like a list that's
that's how it works in the worst case in
the best case what we have right now is
that you try to first linked to the
peers who have a specific service that
you need and then hop further on like
the worst cases is having thing yeah
yeah validation every message is like is
there a pattern no they go sale let's
say I realized somebody else's message
especially on a stove yeah so we've
talked about the idea of kind of like an
act where you know once we've seen it we
acknowledge we like to catch of it so
like we're not gonna like push this if
we receive it one more time we're gonna
like ignore it filter problem being is
some what that does is if the context
that if you're local if the one if
you're man that disconnects from like a
larger group you end up pushing that
really quickly and then the message gets
dropped
so we've played with the idea of kind of
like expiry times and stuff like that
but it's still kind of a big open
question until we can actually deploy
this in a bit of a blur and a larger
scale to actually like kind of see like
how long does the message survive you
know until it can actually get to its
end user one of the problems we've had
right now as well as testing anything
Bluetooth is Pichet they will be optimal
if we could like use something like
white blockers spin up all our notes and
run it but that's close to impossible
because of how Bluetooth works Bluetooth
the way it works is like it's driver
dependent it's operating system
dependent and then those operating
systems implement different api's and so
like our Mac implementation would be
really nice if we could just spin up
fake Macs and test it but we can't do
that because us so you can't spit out
magnet VMs because it doesn't exist
unless you spend on packing Tosh's which
then usually don't have the proper
Bluetooth drivers so the entire testing
of this requires us to actually get
together physically and test it which
has been kind of hard considering daily
living
yeah we're gonna work on something
better yeah if you have any mac books
you will donate we'll take them
so here what happened is we're both
running a real heir with just a basic
service that implements just normal
messaging between Eric and I it's a
essentially it's a terminal chat up that
just spends a main channel its cents to
a service directly so that anyone who
would be connected to this channel would
now just be receiving these messages and
our Pro Cemetery which is pretty cool
next thing I'm going to do is I'm going
to show you the code does some of this
stuff this pump is also too small
you guys know how to use your any
questions while dc2 message replay they
give the prettiest partitions and then
reconstructed you replay messages yes
message to retransmission by yes if you
like exactly yeah so right now what
happens is a message will walk around in
a network for quite a time until you
know it's no longer choose to retransmit
it it's a passive it's a very naive
sending algorithm which I will show you
here here we go that's some so this is
essentially the same function and what
happens in the first check is we ensure
that the message I there has a recipient
which is a device or a service which is
like a characteristic like if you're in
transactions or whatever the recipient
is a identifier is identified by a
public key so that one recipient can
have multiple transports attached to it
kind of how multi addresses work in the
p2p and then what we do is we try to
serialize a message because it's a
protocol buffer that's not really that
important and then we get to we iterate
over our transports and our transports
have specific peers and what we first do
is we check if that if our recipient
isn't empty we try to find a peer to
send to that that has that
specific PR ID and if we do that we
return we've done a successful set we
don't need to send it to anyone anymore
what we do otherwise is we look for all
the peers which implement that specific
service and we then flood that message
to every single member who implements
that service and when we do a flood send
we ensure that we're not sending a
message to the person we received it
from where the person who originally
sent it so if for example Eric sends
Greg a message and then great passes
that home to me I won't send it to any
one of those anymore but for example if
America sends Greg a message and there's
someone between right and I Greg may
receive that message again because we
don't have the entire sentence to really
have the first because that's the
original sender and the latest because
that's the person we thought of from
their optimizations we computed this and
then we count how many peers we sent it
to because with if we sent it to none
now this is part of our naive approach
we end up just letting it to every one
of our peers which is kind of ugly but
it works for our current implementation
news case so that's pretty much
architectural E versus what like Iraq
with the geographical range talk about
you have different
listen there's other mechanisms yeah
there will be different like ways up
because for Bluetooth as well you do the
limits itself on to eight peers so we
need to optimize that we're hearing with
best possible peers of a specific time
with Wi-Fi direct you don't really have
that you can start direct connections
with I think almost like 16 or 17
devices at the same time bluetooth
you're limited to eight so the way we
appear right now very naive but there's
open research issues on how to best
appear with other members so because of
the limitations of all these things like
we have naive implementations but we
know of course that we need to have
better implementations and discovery and
routing will be different based on
device of course like if I have finding
etc but yeah that's pretty much the
entire scent function and this is pretty
much the hardest part of ultralight
being like when you implement a
transport you don't need to care about
this when you met a service you don't
need to care about this we take care of
that then I'll quickly show how
[Music]
transports work should in a very rough
way because there's a lot of ugly code
on top of it what happens is a transport
asset implements this sending this
listing function and they then have
callback functions which is like the
transport received certain data which is
which the node implements so that when
data is received the node tries to
unpack it checks if it is supposed to
handle that data and then passes it one
layer up which would be for example your
application so the node does all that
checking for you so if you implement
electrolyte beam you can be certain that
you're only receiving packets that you
know how to handle or that were sent to
you directly and are not just packet
- forward because right now what we have
ultralight beam notes are all have a
forward capability so that we can have
this strong network so even like if you
were building a chat app and someone
else is building a game for example and
those both implement butcher light beam
what will happen is your chat app might
actually really someone else's game at
packets and that way you can build like
a really strong network like just
imagine in New York City or blog set and
both telegram had all fine messaging you
never waste data again minutes you just
walk through it at this point so yeah
that's pretty much what we have I'm
gonna show the real layer code as well a
lot of this code which we have external
and the layer is going to become no
native code later on that's an open pool
request right now but real layers are
really simple as well what happens is it
checks if we have that specific service
and then that message is processed by
specific service so in the case of our
chat app it was really just decoding the
data that we had in our packet I don't
know if I have that person joined it
I don't have internet oh yeah see if we
had a multi being you see it though it
certainly the real Ayres will just be
having a much three that they find in
frustrating they were like opt-out so
this is kind of there's this so what
we're thinking of right now is like an
accounting model and then we do some
form of tit-for-tat that you wouldn't
continue relaying messages through for
someone given that they have used up all
their bandwidth unless they for example
start paying but the second we have some
naive accounting model we can figure out
the incentive models on top of that so
that's why we started it as New York
because we thought about this would be
cool for you that also have payment
channels on top of it so that's someone
like you pay for relays which we can do
and it might be it would probably end up
being she preferred than having to get
data into certain places yeah exactly
[Music]
are there any questions
not yet like we're very early stage in
spam attacks amendments are relatively
hard to solve
it's called laser so we were looking
into more traditional amendment routing
protocols and there's three of those
essentially that are used for amendments
because the problem the problem with a
lot of these routing protocols is that
they don't work the second you have any
aspect of connections made very
short-lived side of a quasar thank you
yeah midnight routing is hard it's
there's like as Dean said there's like
three different kinds there's obviously
trade-offs in like processing speed
early yeah you can either have like very
accurate routing or you can have where
you would have to do a lot a lot of
computations so yeah one of our next
steps is going to be investigating like
building out all of these different ones
and do the actual artist testing them
out and obviously doing original
research on that I can see if we could
talk about something better as well and
also with when it comes to the real
layers to kind of address like your
question I like that ideally in a sales
falling like an ER
here is an example of an official it's a
little bit easier you can probably get
away with like with just like a mobile
phone or a tablet you know kind of doing
that and in against city or in a much
more dense area let's say let's use the
protest fine then right like a protest
that goes on we have like a lot of
people are running around ideally what
you could do in those situations is kind
of set up like actual devices that are
meant to be real layers it could be as
simple as like you know battery packs in
a backpack and like very powerful
computer running in their real areas
that are intended for dense areas should
not be a phone they should be something
that you know can actively take a
beating and are expected to take a
meeting so you can get the throughput we
need and again it's like specific it's
for the specifics to say I want to
contribute to this like you do have the
kind of capacity attached to it which
allows for the data any sort of yeah
yeah yeah exactly so the beauty the
beauty of all this is that you can
choose which services transports want to
use you can choose Bluetooth Wi-Fi you
can also choose what type of a node
you're running obviously in
centralization laws would be cool to
like you know
Constance is like more of like a as a
goodwill it's like a public good like
you know when you need this it should be
used i don'ts for we don't it be
beautiful if this is like running all
the time like a subway you know but in
ideal ideally and realistically speaking
this is something that should be using
like very for the use cases and like
concerts and whatnot to which like
people are going in understanding the
conditions and like knowing what like
this is just like a very viable way to
communicate yeah so ideally I didn't
you've never actually had a real ER yeah
like given there would be enough device
coverage in a place like New York City
you've never actually had a real layer
because you would just halt until the
destination was found that's also
something that like guess I glossed over
and plank you don't actually need ever
eat the internet in these use cases we
always say the internet so that it's
like way like your phone connected can
talk to people but in reality as Dean
says if like at a concert you just
trying to coordinate like where you sit
where you're standing right and like
that's what's really powerful is that
you can say like where you are kind of
like the same thing with like you know
live protests or whatever you can like
it's a lot easier to coordinate where
you are when there's like a million
people you know on the Raptors won the
NBA title I was trapped in the streets
of Toronto and literally did not know
where my friends were it was awful and
like that's kind of like where the use
of days like this becomes very powerful
and that's why I say it's very like you
stay specific I don't think
should be like widely deployed 24/7
rather like deployed agree on a location
missus you guys have any sort of like
countless mechanism besides like I guess
what really Bluetooth Low Energy hack
the device right it's like basically the
biggest I think not troll box right
because like if I'm at a concert a
million message going from filter flying
than my friends just know because so
Bluetooth Mac's often aren't exposed by
high level in the eyes because of
security reasons so what ends up being
exposed as a UUID that has changed for
every device
so there's devices have a public key
probably kind of played live p2p so you
have an identity that can be found on X
transpose okay the UID can be set so
it's you know the public/private key
cops yeah is there any information like
your the tendinous Indian your example
about the Raptors downtown trying to
find somebody else is there any
information about when you receive a
message which direction that that came
from you could potentially use this for
about our quarter naive
friends aren't saying here's what we
oughta size you're trying to get to
where that message initiated physically
because of all these like yes uh the
inferior yeah if you can do that because
a group of people I think there's two
separate groups of people one at
university one of the one of the
University of Toronto where they were
actually they're able to steer ethically
possible where they were able to
actually do in or offline GPS by
bouncing off of Wi-Fi and Bluetooth
signals to understand where they are in
proximity to the building so it's
definitely possible and I do know that
you do have access to the range and vo -
yeah I don't know yeah yeah you know if
you give some sort of bounces something
so you can it would have a size range
yes si equal zero strength
yeah but you have to do some like pretty
nifty accounting to kind of like
basically you'd have to like essentially
like retranslate the entire shape right
because you'd get some like really ugly
shape and get some zigzag and you have
to basically find click there's a
straight line somewhere along with those
joggers so bluetooth you're looking at
with 35 the tops yeah yeah you only have
like 35 feet tops you like realistically
speaking you can probably expect to get
like upwards of like 8 hops like if
you're in like close together like this
enough that's out immunes you can
probably at least get it off
see you like there's a it's a lot of
data to be also transmitting across the
wire because we don't we don't keep that
the you know say we only took the last
recipient in the first one we could pay
you mean at a counter to some degree but
you know it's also difficult yeah yeah
for sure you can like attach like a
bunch of metadata to like your your
packet based on link replay the previous
sender and then based on that you can
decide like kind of which appeared to
send it to next best right like using
like the our our SSI example I guess
generally signal strength doesn't
necessarily mean like somebody's brother
or not but I mean sometimes it does but
like you can if you were trying to
disseminate information really quickly
right you can attach like our SSI
information to like you're getting at it
and then you try you prioritize sending
it to like the person who's furthest
away and look down on that and within
that way you can like so much
information like super quickly right
because you know that guy's far away so
that he tries sends his peers pops
Brandon
and you guys think about using radio in
one slide talk about rabies how we're
gonna do it as a troll transport you
know someone's working on it right now
actually control yeah because it's like
you know those obvious the radio of
dudes and like sent messages across
Europe embassies yeah someone is working
on a transport for that put a little
cream here you can read your goes a lot
further right yeah and you've already
established that it's like you use the
acknowledged thing you're talked about
earlier and they found each other
potentially have something within the
radio signals trigger sort of on some
sort of frequency that's all so whatever
it's very light payload and then boom
you've got a natural direct path to know
you should do going on github there's
there's research repository and if you
have any ideas like that relationship
with like any research interesting
research ideas like we're trying to get
as many people as well as possible to do
comas what's that company that does I
think they've done Bitcoin transactions
over radio yeah yeah but the difference
about their thing is you need external
devices for their mission what's do you
know the name of the company someone
keeps sending it to us
yeah we've kept team like we don't wanna
do this this is you need separate
devices okay so and it also says Bitcoin
transit okay so it's specific to their
device can you generalize no it's it's a
generalized thing that then someone
built Bitcoin stuff long but it requires
specific hardware it requires your phone
to be plugged in one at
and the list goes on yeah ten exactly oh
yeah it's patented it's closed source
that's yeah well it's the bugger spike
the main reason we're doing this yeah
there's like obviously I think the
umbrella well no now in Hong Kong
there's like because firechat used to
exist yeah when what happened there is
the developer was told by the Chinese
government to stop building on it
because he's a Chinese citizen right and
now there's like another one and they
have an SDK but it's a closed source sdk
and you need an API key weird that you
can have them in our chat and there's
like the other thing because they're
both proprietary they're closed so
that's written by us oh yeah average of
Pi yet they're closed source they cost
money to use it's like we don't want to
pay for this we want to be able to like
just download it and use it you just did
yeah I think it's what I think it's MIT
yeah it's all MIT like yes and that's
the point right
steal steal it if you run it use it like
this is a free public good for people
right this is and as you said you hate
radios that just means we can as soon as
we get any better bands and - play
further
yeah and once we get more like low
frequency bands just like think of the
possibilities here we can literally do
like because why would I want to use the
internet when it's attached to me I
speak French there's a lot of
possibilities here design space is huge
it's awesome yeah wouldn't you meet
Akash the unique idea the messages that
you're providing around if you can run
into an infinite loop with yeah yeah so
you guys are caching with you we are
caching right now in the naive
implementation but there's a discussion
by one on how we must do that oh right
there there's also a question on if we
need a build that data sync protocol on
top of it something like TCP so that we
can assert that messages are somehow
received but the question then there is
how do we do that with all the holes
that are in between two points there's a
lot of there's a lot of ideas that we
are floating around but a lot of
research that needs to be done to figure
out a solution unlike this clever
chassis to do that so if for instance
you had the ability you also have a
little frequency band we could and you
could in theory set something up where
the acknowledgments go over the low
frequency bands that everybody can
receive it and we don't actually use it
to actually just drop the network and
you go and use Wi-Fi and Bluetooth we
can send way more you know or bigger
payloads across and that that could be a
way to like cheaply do it you know when
the device receives message it goes hey
I received it like fine
thank you right but again these are all
like open questions and obviously
becomes harbor challenges and we're
trying to make it so that ideally
doesn't matter like you shouldn't have
to have hardware I'm gonna have the
challenge of like battery on a mobile
phone Bluetooth and Wi-Fi direct you
don't want that to be volume all the
time because at one point you're gonna
run out of battery yeah there's a bunch
of those technical jobs should allow
people to harvest the battery level
three layers you see that that's
actually a nice yeah
that's right all right
[Applause]