The description of the NETCONN_DONTBLOCK flag in the api_lib.c source file above the functions netconn_write_partly() and netconn_write_vectors_partly() says:
@param apiflags combination of following flags : - NETCONN_DONTBLOCK: only write the data if all data can be written at once But as far as I can tell, it's quite the opposite. For a non-blocking socket, you should be aware that only part of the offered data is being sent. Regards, Harrold
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