Start lwIP UDP in a Task

Hi, I’ve been trying for hours to run a simple UDP example from the lwIP documentation in a FreeRTOS task. My application does not return from the method call netconn_connect(). Although it is likely to be a lwIP problem I am not sure if I can use the netconn/netbuf methods in FreeRTOS. Does anybody have experience with this? Is there an example available which also uses netconn_recv()? The task function looks as follows: portTASK_FUNCTION(vNTPClient, pvParameters) {    struct netconn *conn;    struct netbuf *buf;    struct ip_addr addr;    char *data;    char text[] = "A static text";    int i;    portTickType xLastWakeTime;    // Initialize with current tick count    xLastWakeTime = xTaskGetTickCount();    // Task loop    for (;;) {       // Check if interface is ready       if (netif_is_up(&MACB_if)) {          /* create a new connection */     conn = netconn_new(NETCONN_UDP);     /* set up the IP address of the remote host */     addr.addr = htonl(0x0a000001);     /* connect the connection to the remote host */     netconn_connect(conn, &addr, 7000);     /* create a new netbuf */     buf = netbuf_new();     data = netbuf_alloc(buf, 10);     /* create some arbitrary data */     for(i = 0; i < 10; i++)        data[i] = i;     /* send the arbitrary data */     netconn_send(conn, buf);     /* reference the text into the netbuf */     netbuf_ref(buf, text, sizeof(text));     /* send the text */     netconn_send(conn, buf);     /* deallocate connection and netbuf */     netconn_delete(conn);     netbuf_delete(buf);       }       else {          print_dbg("Waiting for IP…n");       }       // Delay the task       vTaskDelayUntil(&xLastWakeTime, ntpclientTICK_RATE);    } } Thanks for your help. Regards, Mathias