Hi there,
So I've researched this a bit and I'm having trouble finding real examples. PPP over serial is - I gather - how early dial-up modems worked.. the computer handled the PPP transaction itself. PPP over some manner of serial (usually SPI) is still used for ethernet and cellular interfaces, but it appears the PPP transaction is done in the interfacing chip itself (ethernet controller or cellular controller) which spares us mere mortals having to deal with any more layers of the OSI model than we absolutely need to.
But.. if I want to do PPP (and, by extension, lwIP) over conventional RS-232 or RS-485 from a Teensy, does such a library exist, or is it hiding in an existing library and I just haven't uncovered it yet?
Thanks in advance..
So I've researched this a bit and I'm having trouble finding real examples. PPP over serial is - I gather - how early dial-up modems worked.. the computer handled the PPP transaction itself. PPP over some manner of serial (usually SPI) is still used for ethernet and cellular interfaces, but it appears the PPP transaction is done in the interfacing chip itself (ethernet controller or cellular controller) which spares us mere mortals having to deal with any more layers of the OSI model than we absolutely need to.
But.. if I want to do PPP (and, by extension, lwIP) over conventional RS-232 or RS-485 from a Teensy, does such a library exist, or is it hiding in an existing library and I just haven't uncovered it yet?
Thanks in advance..