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  Tests for lwIP's sock_tcp port
  ==============================
  
  This tests the `sock_tcp` port of lwIP. There is no network device needed since
  a [virtual device](http://doc.riot-os.org/group__sys__netdev__test.html) is
  provided at the backend.
  
  These tests test both IPv4 and IPv6 capabilities. They can be activated by
  the `LWIP_IPV4` and `LWIP_IPV6` environment variables to a non-zero value.
  IPv6 is activated by default:
  
  ```sh
  make all test
  # or
  LWIP_IPV6=1 make all test
  ```
  
  To just test IPv4 set the `LWIP_IPV4` to a non-zero value (IPv6 will be
  deactivated automatically):
  
  ```sh
  LWIP_IPV4=1 make all test
  ```
  
  To test both set the `LWIP_IPV4` and `LWIP_IPV6` to a non-zero value:
  
  ```sh
  LWIP_IPV4=1 LWIP_IPV6=1 make all test
  ```
  
  Since lwIP uses a lot of macro magic to activate/deactivate these capabilities
  it is advisable to **test all three configurations individually** (just IPv4,
  just IPv6, IPv4/IPv6 dual stack mode).