[Q] Simultaneous WiFi (no-data) & 3G (data)

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Hi there everyone,

I'm wondering if on an android device there's a way to force it to keep open a wifi connection that is not used for data, for example to a Seagate Goflex Satellite (WiFi HDD) or eye-fi (WiFi SDHC) while also being simultaneously connected to 3G for data. Obviously connecting to 2 wifi connections is out of the question, but thought maybe somewhere out there is someone who 's found a way to do what I'm looking at.

Thanks.

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Originally Posted by lufc

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Thanks

Bump

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Bump - anyone have any idea?
Thanks.

No-one has any ideas?

Even I am hunting for the same.
Check these links
http://mobisocial.stanford.edu/news/...yservice-java/
https://gist.github.com/CyanogenMod/...tyService.java

I am not sure if it will work though! Coz I find this reply more convincing..

Pallas Says:
April 13, 2012 at 5:58 am

are you sure the packets are going thru both interfaces?
I think it doesn’t work, simply because you would need two default gateways, leading to some hard problems:

- how does the system choose where to send the packets?
- for outgoing packets: unless the two connections have both statically assigned public IP addresses, which is very unlikely, you will end up with two differently NATed paths, and the client will refuse packets coming from two different ip addresses on the same connection.
- for incoming packets: to let the client send packets to both interfaces, you would need to send them from both interfaces with different source ip addresses: it will not work, the client will get confused. and anyway you would need support at the application level.

to solve all this, you’d need to:

- make an ad-hoc application which understands all this and can send chuncks to both interfaces, then merge all the returning chunks. you’d need support at the application level: for example you’d need http byte range support on both client and server
- divide “equally” the single specific connections thru the two gateways. this may work but it’s pretty hard if you do not have access to advanced routing and traffic shaping at the kernel level. may be possible on a phone with custom compiled aosp rom and modified kernel