[arm-allstar] Wired tethering to phone (modem) usb or ethernet

[David McGough]

Hi Terry,

Yes, you can directly attach a phone to a RPi2/3 board via USB. However, 
you've got to have the Linux drivers needed to pull this off; and what
drivers you'll need will depend on your phone.

As has already been suggested, it's easier to just to use your phone as a
WiFi hot-spot and connect using that method. I'm curious about what type
of packet loss you're experiencing??  Unless something about your phone's
"hot-spot mode" is flaky, I'd expect the WiFi connectivity to be rock
solid.

As a testament to the reliability of the RPi3 WiFi hardware, I'll mention
that I run all my "in production" RPi3 systems strictly via WiFi---not a
single Ethernet cable in sight!! And, the long term performance is
flawless. I've attached a graphic showing 30 hours of smokeping results
for one of my systems, as monitored from my office. The tower site is 22
miles away and there are 3 microwave links involved! ....Note that the
bulk of the latency and jitter is due to all the infrastructure microwave
networking.

73, David KB4FXC



On Fri, 24 Nov 2017, "Terry Bethlehem via arm-allstar" wrote:

> The opposite. Use the phone as the router so to speak. What I am curious
> about is making a physical connection between the pi and phone, so the data
> tx rx from the pi, is connected to the phone. Like some specifically made
> wireless routers, that have ethernet Jacks. I might just buy a Linux
> compatible usb to rj45 dongle and see if it works. Whether I'd need a
> crossover cable or standard, I guess I'll find out.
> 
> Back to one of my earlier questions. Does linux have the capability, like
> windoze, to plug in a phone with a data usb cable, and use it like a
> physically tethered modem?
> 
> On Nov 24, 2017 5:29 PM, Doug Crompton via arm-allstar <
> arm-allstar at hamvoip.org> wrote:
> 
> > I assume you mean using the phone as a wireless hotspot to the Pi3
> > wireless. This works fine and there should be no packet loss between theses
> > two devices located close together. I suspect your problem is packet loss
> > on your cell phone hotspot to whatever cell you are using. Hotspot
> > connections are not perfect. You can expect occasional packet loss and in
> > some areas no service. Everyone wants perfect but you are probably never
> > going to get it on a cell hotspot. VOIP is real time without buffering or
> > error correction and any disparity in the network will show up in what you
> > hear. Switching sites causes a brief dropout If you were using a web
> > browser or even streaming a movie which is buffered on your hotspot it
> > would not even show up unless you were in a totally bad area. You might ask
> > why your phone works better than the hotspot. Cell providers want the phone
> > itself to work the best and thus it gets priority. Since most Internet use
> > of a smart phone is limited to web browsing or some other service where the
> > disparities don't show up they can get away with not having perfect
> > internet.
> >
> >
> > *73 Doug*
> >
> > *WA3DSP*
> >
> > *http://www.crompton.com/hamradio <http://www.crompton.com/hamradio>*
> >
> >
> >
> > On Fri, Nov 24, 2017 at 3:05 PM, "Terry Bethlehem via arm-allstar" <
> > arm-allstar at hamvoip.org> wrote:
> >
> > > Does this distro have the ability to, like a pc, plug a phone into it,
> > usb
> > > cable, and the os of the pi can use the phone as a modem? Reason behind
> > > this is that I sometimes get packet loss when doing wireless tether. I'd
> > > like to try this and see if it fixes the problem and has better
> > > performance.
> > >
> > > I thought about using an otg adapter, then a Linux compatible usb to rj45
> > > adapter and feed the pi Internet. I've seen videos where the android
> > phone
> > > could be fed Internet this way, but haven't found any info yet about the
> > > other way around. The phone providing Internet to the pi.
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