On Sun, 27 Dec 2020 16:02:27 +0000, Chris Green wrote:

> The Natural Philosopher  wrote:
>> On 27/12/2020 15:08, Joe wrote:
>> > On Sun, 27 Dec 2020 14:27:46 +0000 Chris Green  wrote:
>> >
>> >> The Natural Philosopher  wrote:
>> >
>> >>> Just use an IP capable dongle forget about 'incoming calls' and ssh
>> >>> riught in. Biggest problem will be on what IP address you appear,
>> >>>
>> >> Yes, as I said it needs a dynamic DNS service but that's all.
>> >>
>> >>
>> > It is possible to get a fixed, public IP address on a 4G SIM, but it
>> > takes a bit of finding. Even then, the actual IP address is dynamic
>> > and private, but the 4G operator runs a NAT server to accept calls on
>> > a fixed public address and route them to the SIM.
>> >
>> > It's a common requirement, and the magic codeword is 'M2M' (machine
>> > to machine). You'll probably need to go to a specialist SIM provider,
>> > the average high-street phone shop salesman won't have a clue what
>> > you're talking about.
>> >
>> That I did NOT know. That simplifies everything
>>
> I think it's quite expensive (M2M that is).

Nah, 3G/4G dongles are only as expensive as you want to make them.

A quick web search shows that they are available from eBay and Amazon.
The magic search term is "3G 4G dongle", which gets you links to 3G/4G
devices that look very similar to USB memory sticks.

Typically they use both 2.4 and 5 GHz bands and some also support
Bluetooth connectivity. Prices seem to range from around GBP 13.00
upwards to  *HOW MUCH???*. They do purely data comms, of course, and
would seem provide much the same connectivity as any mains-powered wifi
router except for being smaller, lighter, powered from whatever its
plugged into and (quite probably) only provides a single connection to
the network.

IOW it does about the same job as the wifi link on a Pi 3, 4 or Zero W
except that it preferentially connects to a 3G or 4G base station rather
than to the nearest wifi router.


--
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Martin    | martin at
Gregorie  | gregorie dot org

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