[lwip-users] netconn_write semantic with NETCONN_NOCOPY flag

[MaX]

Hi,

I'm looking to the netconn interface and I don't completely understand the semantic of the netconn_write.

The signature of the function is:

err netcon_write(struct netcon * aNetcon, void* aData, size_t, aSize, u8_t API_Flags);

With the NETCONN_NOCOPY flag, the data should remain unattached until it has been transmitted. 

Therefore, what mechanisms can I use to know when a sent buffer can be reused in a safe way?

Thanks,

Massimiliano

P.S. I think lwIP is really a nice project =)