[lwip-users] Query for output complete before closing TCP connection

[Marco Jakobs]

Dear all,

i'm dealing with an assert i'm getting sometimes after sending some TCP packets. In a case i caught here, i'm sending out some packets on a TCP connection, using netconn_write with "NETCONN_COPY" option. Right after sending out my last packet, i'm calling

netconn_close(conn);
netconn_delete(conn);

to close and delete the TCP connection.

But sometimes i've noticed device restarts, and just now i caught an assert:

.../Libraries/lwIP/src/core/tcp_in.c:208:tcp_input: TIM

My theory (?) is, that there may be one (or more) of the packets are still in output when i'm calling the netconn_close and netconn_delete which causes problems with lwIP? If this may cause the problems, how can i query if all packets are sent before closing and deleting the connection?

Marco