Does IOS support wifi and 3g / 4g connection at the same time?
I have a client who has a device that has a built-in Wi-Fi hotspot and would like to connect it to an iPad 4G vie wifi and send data simultaneously over a cellular connection. Is this supported in IOS and if so can you point me to the relevant documentation. Any suggestions are greatly appreciated.
Jim
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I searched for this answer myself and ended up finding a solution here:
The solution does not contain any code and will change the settings on your iPad instead. + Change settings to connect Wi-Fi to Static instead of DHCP. In the Static settings, the Router EMPTY field. What I did was write down the IP address, subnet mask and DNS values that were used by DHCP, and then just left the Router field blank. I found a couple of other posts that suggest entering 0 or 0.0.0.0, but leaving it blank is what made it work for me.
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Compared to Android, iOS supports the simultaneous operation of multiple network adapters. You need to write C code that works with BSD sockets, enumerate, bind, and handle network interface changes.
By the way, ideologically it is very important to continue to use this built-in BSD functionality in C / C ++, otherwise, who knows, Apple may completely remove BSD socket support in 5-10 years :-)
Some examples on how to do this can be found here: https://gist.github.com/avesus/fdb465b60a4f5204845c
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