Don't get me wrong, I'm not a patent troll, neither I want to sue anyone - that is against my attutude (I consider myself an old time hacker rooting from late 80s :)). I'm just a co-developer and co-holder of the patent for a device that does, among other things, exactly what topic starter described. We began developing it back in 2011 and proceeded for several years, we had been spending our free time and "pocket" money on it. In case you are interested it took us to route and assemble 22 versions of PCB prototype of the main board and 5 prototypes of a radio. We even exhibited it at one of the electronics show in Moscow. As we failed to find sufficient investment to push it to the market, we decided to freeze the project in 2015. In my initial comment that was silently and shamefully deleted, I proposed to aquire our patent, that's what might have any value today, as schematics and hardware are all outdated. As mentioned above, discussing patent details on public is not any good idea, that is why I simply pointed that I can be contacted on these matters.

I understand that hackers are strictly opposed to any sort of patents or copyright. But it is not avoidable topic once you are into business of settling or growing your own company (or a startup). And this is a startup place, isn't it ?