Decouple from Ethernet, introduce "l2" #3370
Merged
+1,723
−780
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mip_test passes, even for IPv6 (unit tests)
mip_tap_test passes for IPv4 (live network tests)
Further tests need to be done (ping, actual packet sniffing, multicast, ...) before merging
PPP is provided just as an example, to be filled after decoupling from AT commands (the latter will become itself a driver)
PPPoE and IPv6 over PPP/PPoE is a stone throw away from that
Minimum changes to net_builtin, no API changes, "complexity" encapsulated in l2.c (decision tree --> table lookup)
G031 test fails because there's no room in flash, to be analyzed