If you use an OS, set NO_SYS=0 and do things as told for that case.
If you don't, set NO_SYS=1 and do things as told for that case.
You can have an OS and run in NO_SYS=1 in a single thread.
In NO_SYS=0, you can call the low-level functions, the RAW API, from
within one thread only, the one that all low-level functions run in.
http://lwip.wikia.com/wiki/LwIP_with_or_without_an_operating_system
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