Dear Valentina,
Thank you for reviewing.
> > For this, export function, connection is established from
device-side
> machine to application-side machine.
> >
> > Following use cases are supposed for the export function.
> > 1) Server application or cloud service serves distributed ubiquitous
> devices.
> > 2) Dedicate devices to server application or cloud service.
> >
> > To connect to cloud service, it needs to connect from inside of
firewall.
> >
>
> Could you please provide some more detailed examples of use cases for
this
> feature?
OK. In figure below,
Home/SOHO/Intranet Internet
+--------+ +--------+
+------+ +------+ |Router, | |Internet|
+|device|---|Linux |-----|proxy, |------------|service |
|+------+ +------+ |firewall| |on Linux|
+------+ controller +--------+ +--------+
ex)
Device Service
sensors ................................... environment analysis
cameras ................................... monitoring, recording
ID/biometric readers ...................... authentication
Connection from outside firewall is usually blocked.
So existing import request sent with attach command doesn't work.
(blocked)|| <--------- # usbip attach
Firewall opens some ports, usually HTTP(80) and HTTPS(443), from inside.
Then export request sent with new connect command works.
# usbip connect ------------------------------>
(passed)
Also, router doesn't route raw IP packets to outside. Some application
protocols are needed. DNS client is needed and proxy may be used.
Firewall or proxy may check application protocol. HTTP is the most
usual accepted application protocols.
Succeeding patches allow to wrap raw TCP packets with WebSocket which
are commonly used to encapsulate packets in HTTP connection. The last
patch introduces WebSocket including DNS client and proxy.
NOTE: I posted v2 of this series of patches on 14 Apr 2015.
Thanks,
n.iwata
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