Set link state correctly in lwIP for interfaces that support
the NETOPT_LINK option. Interfaces that do not support it
(like tap for native arch) remain up all the time.
Netdevs that support NETOPT_LINK but do not send NETDEV_EVENT_LINK_UP/DOWN
events will end up with a mismatched link state - but DHCP would
already not start for them either.
Use netifapi to signal lwIP to do the work in its own thread.
Lists state, link type, v4/v6 addresses.
Currently read-only.
Using lwIP debug system to print addresses, to limit dependencies
and work with dual stack setup. Most other code seems to only
allow either v4 or v6 networking. For that to compile I
had to change the `SZT_F` format string due to this error:
```
error: format '%lu' expects argument of type 'long unsigned int',
but argument 2 has type 'size_t {aka unsigned int}'
```
Switching to the lwIP default format string here.
Outputs the following on my ESP32 board with Ethernet,
when both v4 and v6 are enabled in examples/paho-mqtt:
```
> ifconfig
Iface ET0 HWaddr: 24:0a:c4:e6:0e:9f Link: up State: up
Link type: wired
inet addr: 10.4.4.81 mask: 255.255.254.0 gw: 10.4.4.1
inet6 addr: fe80:0:0:0:260a:c4ff:fee6:e9f scope: link
inet6 addr: 2001:db8:1000:0:260a:c4ff:fee6:e9f scope: global
Iface ET1 HWaddr: 24:0a:c4:e6:0e:9c Link: up State: up
Link type: wireless
inet addr: 10.4.4.82 mask: 255.255.254.0 gw: 10.4.4.1
inet6 addr: fe80:0:0:0:260a:c4ff:fee6:e9c scope: link
inet6 addr: 2001:db8:1000:0:260a:c4ff:fee6:e9c scope: global
>
```
With PR #14349 the double stack mode for lwIP was activated. The ATWINC15x0 driver was provided before the changes in PR #14349 but merged after that. Therefore, the changes for the driver were not taken into account anymore and have to be applied accordingly.
IP4_ADDR_ANY is a generic address of type IPv4 when lwIP is compiled
with both IPv4 and IPv6, so we need to extract the `ip4_addr_t`
component when using with `netif_add()` as that is the expected type.
Prepare for handling pkg state with files. So it requires having the
path defined before declaring targets. In addition, it cleans up the
old git-download target.
Either the sock is provided with `sock_*_send()` or not. In the first
case the indirection is not necessary, and in the second we need to
delete the created `conn` within `lwip_sock_send()` anyway, so returning
it makes no sense.
To avoid priority conflicts with the WiFi hardware driver thread which has priority of 1, the default thread priority of lwIP's TCP/IP thread is decreased to 2.
If module log is used, log.h should be included. Otherwise, it might lead to compilation problems since LOG_ERROR macro isn't know in expansion of LWIP_PLATFORM_ASSERT macro.
From lwIP CHANGELOG
(STABLE-2.1.2):
++ Bugfixes:
2018-11-21: Jens Nielsen
* netbiosns.c: fix expecting too large packet (bug #55069)
2018-11-19: Dirk Ziegelmeier
* smtp.c: fix compiling with strict C compatibility because of strnlen (bug #55034)
2018-11-12: Simon Goldschmidt
* tcp.c: fix overflow check in tcp_recved triggering invalid assertion (bug #55015)
2018-11-12: Simon Goldschmidt
* tcp.c: fix a bug in sending RST segments (sent from port 0)
(STABLE-2.1.1):
++ Bugfixes:
2018-11-01: Joan Lledó
* sockets.c: fix bad assertion in lwip_poll_dec_sockets_used() (bug #54933)
2018-11-01: Dirk Ziegelmeier
* ip4.c: don't send 127.* to default netif (bug #54670)
2018-10-23: David Girault
* altcp_tls_mbedtls.c: fix use-after free (bug #54774)
2018-10-23: Ognjen Bjelica, Dirk Ziegelmeier
* snmp_scalar.c: Avoid NULL pointer dereference (bug #54886)
2018-10-23: Simon Goldschmidt
* Fix missing standard includes in multiple files
2018-10-17: Ivan Warren
* def.h: fix casting htonX and ntohX to u16_t (bug #54850)
2018-10-12: Simon Goldschmidt
* Revert "tcp_abandon: no need to buffer pcb->local_port" (fix that source port was 0 for RST
called when aborting a connection)
2018-10-11: Jonas Rabenstein
* tcp.c: tcp_recved: check for overflow and warn about too big values (patch #9699)
2018-10-06: Joan Lledó
* sockets.c: alloc_socket(): Check for LWIP_SOCKET_POLL when setting select-
related variables (patch #9696)
2018-10-04: Spencer
* tcp.c: Update prev pointer when skipping entries in tcp_slowtmr (patch #9694)
2018-09-27: Martine Lenders
* lowpan6.c: Fix IEEE 802.15.4 address setting (bug #54749)
