Re: [lwip-users] tcp_output doesn't flush

[address@hidden]

Thiscord wrote
> The tcpSendQueue then only hands over the size of the data to send to a
> dedicated send task.
> The send task looks like this:
>
>         uint16 payloadLength;
>         while(1)
>         {
>                 xQueueReceive( tcpSendQueue, &payloadLength, portMAX_DELAY );
>                 tcp_write(cmd.pcb, txBuffer, payloadLength, 0);
>                 xSemaphoreGive(tcpSendProtection);
>                 tcp_output(cmd.pcb);
>         }

The simple answer is what you're doing is wrong. You must not call tcp_* 
functions from any other thread than the tcpip_thread. You might want to 
use the netconn API to keep your threading setup.

Simon