Yes! I am absolutely interested in an interface to your ad-hoc
Right now, our client program calls the net-snmp program 'snmpget' to
access individual MIB table entries. Mainly we just use 'link quality'.
However, a C library based on the net-snmp library might be just perfect
for accessing the MIB cleanly and easily. Then this C library could be
linked into either a client program or the Player server if we want a
Player interface / driver. The nice part about linking it into Player is
that we could build models in Stage and Gazebo using the same interface!
And I guess that is what Player/Stage is all about.
----- Original Message -----
From: "Josh Bers" <jbers@...>
Date: Thursday, November 6, 2003 6:55 am
Subject: RE: [Playerstage-developers] Gazebo Truth
> Hi, I work with Jason Redi on enhancing ad-hoc networks for use
> with robots.
> We have developed an extended interface for sharing status of the
> network (topolgy, link costs, etc) with a robot controller. So far
> we have
> built an SNMP MIB and Java client access to the info. We are
> thinking about
> building a Player interface/driver to the data as well. Would there be
> interest in this?
> > -----Original Message-----
> > From: playerstage-developers-admin@...
> > [mailto:playerstage-developers-admin@...]
> > On Behalf Of Nathan M. Farrington
> > Sent: Wednesday, November 05, 2003 6:28 PM
> > To: Pranav
> > Cc: playerstage-developers@...;
> > bpg@...; redi@...
> > Subject: Re: [Playerstage-developers] Gazebo Truth
> > Hi Pranav,
> > I remember Ben Grocholsky <bpg@...> was
> > interested in simulating wifi in Gazebo. Have you talked to him?
> > Our group is also interested in a wifi simulation. The
> > question is now, to what extent do you want to simulate it?
> > For instance, we are using BBN's ad-hoc network routing
> > software developed by Jason Redi <redi@...>. Ideally, we
> > would like to simulate not only the 802.11b radios we are
> > using, but also BBN's ad-hoc networking algorithms.
> > If you just want to simulate a regular 802.11b (or g) radio,
> > then the task is much simpler, but still tricky depending on
> > what exactly you want. For simulating the signal strength of
> > the radio, you could use an empirical formula based on a
> > model of 2.4GHz communications. For instance, the signal
> > strength has a sharp dip at a distance where multipath
> > reflections off of the ground destructively interfere with
> > the line-of-sight transmission from the transmitter to the
> > receiver. The problem should be more pronounced when there
> > are more objects to reflect off of, especially inside of a tunnel.
> > An improvement would be to drop packets in proportion to the
> > degradation in signal strength, to the point where robots can
> > no longer communicate with each other! And what about
> > collisions caused by multiple radios in the same area? I'm
> > not an expert in networking or wireless networking like Dr.
> > Redi, but I imagine that wireless network simulation has
> > numerous issues. Anyway, its not an easy problem but I think
> > it would be very useful to lots and lots of people.
> > Also, we should find out what other wifi simulators are out
> > there and see if we can incorporate any of those efforts into
> > Regards,
> > Nathan Farrington
> > ----- Original Message -----
> > From: Pranav <pranav@...>
> > Date: Wednesday, November 5, 2003 11:42 am
> > Subject: [Playerstage-developers] Gazebo Truth
> > > Hi guys,
> > >
> > > Just exploring the possibility of having some kind of wifi
> > > simulation ( a
> > > bare-bones one ) in gazebo. For that i think i would need to
> > > all the
> > > other wifi devices ( which i would have to write) in the
> > > anyonehave any ideas on this?
> > >
> > > thanks
> > > p
> > >