NY  wrote:
> "Chris Green"  wrote in message
> news:83cmbh-3vl4.ln1@esprimo.zbmc.eu...
> > Are there any simple 3G/4G add-ons for a Pi that will allow it to
> > power up into a mode where it has the ability to be connected to via
> > the mobile data connection?
> >
> > I want a system that I can connect to from my home desktop/laptop on
> > demand.
> >
> > Sort of 'thinking out loud' about this:-
> >
> >    I suppose a USB 3G/4G dongle could provide the hardware required
> >    to make a mobile connection to the PI, recommendations?
> >
> >    It has to 'connect on demand' dialling *to* the Pi, it can't keep
> >    the line open all the time, very expensive!
> >
> >    So, is there software for Linux (and thus for the Pi) which will
> >    handle incoming calls to allow ssh login?
> >
> >    How does one manage the other end?  Is there Linux desktop
> >    software to allow one to dial up a remote system and then squirt
> >    ssh down the connection?
> >
> > Any/all ideas would be very welcome.
> >
> > I'm happy with fairly low-level stuff, I am a retired software
> > engineer, grew up with Unix (solaris) command line and I'm also quite
> > into home-build electronics projects.
>
> As I understand it, data connections (as opposed to voice connections) are
> permanently on and don't accrue connection charges. You get a standard
> amount of data per month that can be transferred over the connection, which
> varies according to the tariff.
>
Yes, I don't think I realised this and it makes a big difference!  Do
they care which direction the data goes?

Does it have to be a 'data only' SIM for this to work or would any SIM
with included data work OK?

> So you need a USB mobile data device and a SIM with a suitable data tariff.
> Then you need a means of connecting to the Pi, in the same way that you
> would if it was connected by Ethernet/wifi to your home network. VNC Server
> on the Pi and VNC Client on the computers that will connect to the Pi will
> give you a remote desktop. There maybe ways of doing it with PuTTY or other
> ssh terminal apps, though I'm not sure how those handle you being connected
> by a public WAN rather than LAN: I've only used Juice SSH on my mobile phone
> for connecting to my Pi over my private LAN.
>
I use ssh and command line for everything.  Once both ends are
connected to the internet it 'just works', that's what I want.


> Since you will be running the Pi headless, one little hint (in case you
> haven't discovered this already) with the Pi 4: you need to tell the Pi to
> boot even if it can't find a monitor connected by HDMI and to set the video
> mode which would normally be negotiated between Pi and monitor at boot time.
>
Yes, I know, I run several Pis headless.  It's a good reminder though,
plus the real killer, the ssh daemon isn't enabled by default.


--
Chris Green
·

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