PPP over Serial

[lePereT]

Missing feature

As far as I can see, it's not possible to make PPPoS connection from NodeMCU. The ESP IDF contains support for this connection type https://github.com/espressif/esp-idf/tree/v4.3.1/examples/protocols/pppos_client

Justification

Please see the following issue #3019 for the uses (for connecting to certain modems, for using UART as a comms bus...)

Workarounds

Bitbanging such a feature would be cumbersome and inefficient.

I'm not that great a C programmer but if the team can provide pointers around difficulty/ease of porting and a steer then I would be prepared to have a stab!