Xtend Module - PPP - AX.25 - IP

We are developing a product that uses the Xtend MESH drop in modules. The base interface for this is serial, so I was wondering is there is a stack available to send IP traffic over it. I was thinking PPP or AX.25. Has anyone had success with this? Does anyone have some code examples for implementing something like this?

Sorry but I don’t think there is any sample code available for that one.