Hello Marco, On Wed, Feb 04, 2015 at 05:43:49PM +0100, Marco Jakobs wrote: > Hi, > > I need to make an interface for LwIP to realize a communication via > non-IP capable radio link. > > We have an existing implementation for cellular systems which supports > IP communication via PPP (like GPRS) which works good, we can > transport IP data from customer devices (RTU's etc.) via the WAN PPP > link using NAT. > > The challenge now is that I need to use a radio link which does not > support PPP as it has no centralized SwMi (let's say it's a > peer-to-peer connection). > > What I think may be the best way is to create a kind of custom "NetIF" > with a "virtual" IP address which is set as the standard gateway - so > from the behavior like the PPP does. I should get the IP data (header > and payload) as a "raw char array" out of this NetIF and can send this > via the radio link. > > All stations which receive these data will then "restore" them in the > custom NetIF (as PPP does with incoming data) and find their way back > into the LwIP of the receiving devices where they'll be treated in a > normal way like any incoming IP data via Ethernet or PPP. > > Is this concept a reasonable way? If yes, is there any documentation > which might help me to write such a "customer NetIF"? If no ... what > would be a better option?
Why can't you use PPPoS over your radio link ? There is also a SLIP implementation in lwIP which have a lot less overhead than PPPoS, but I don't known its current status, it probably wasn't used for a while. Sylvain
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