[lwip-users] link down and netconn problem

[Martin Velek]

Hello,

my EMAC driver is capable to detect link down(unplugging eth. cable).
This situation is returned in low_level_output by ERR_IF and
netif->flags &= ~NETIF_FLAG_LINK_UP. This is a normal behavior,
netconn_sendto returns ERR_IF.

However after plugging cable and sending next packet, this operation
fails also with ERR_IF. I have tried to trace programm and this is a
sequence of called functions:

netconn_sendto
netconn_send
do_send - return.

The first line of do_send function contains "if
(!ERR_IS_FATAL(msg->conn->err)) " that causes return without checking
the line status.

Does it mean, that before any netconn_sendto I should set conn->err to ERR_OK?

Martin


P.S.
I am using only one struct netconn per task.