Fix compile issues with LWIP_SINGLE_NETIF (raspberrypi#515)

Fixes raspberrypi#514

Author: peterharperuk

pico_w/bt/picow_bt_example_common.c

@@ -97,7 +97,7 @@ void picow_bt_example_main(void) {
     } else {
         printf("Connected in %lus.\n", (to_ms_since_boot(get_absolute_time()) - start_ms) / 1000);
     }
-    printf("\nReady, running iperf server at %s\n", ip4addr_ntoa(netif_ip4_addr(netif_list)));
+    printf("\nReady, running iperf server at %s\n", ip4addr_ntoa(netif_ip4_addr(netif_default)));
     lwiperf_start_tcp_server_default(&iperf_report, NULL);
 #endif
 }

pico_w/bt/standalone/server_with_wifi.c

@@ -100,7 +100,7 @@ int main() {
 
     // setup iperf
     cyw43_arch_lwip_begin();
-    printf("\nReady, running iperf server at %s\n", ip4addr_ntoa(netif_ip4_addr(netif_list)));
+    printf("\nReady, running iperf server at %s\n", ip4addr_ntoa(netif_ip4_addr(netif_default)));
     lwiperf_start_tcp_server_default(&iperf_report, NULL);
     cyw43_arch_lwip_end();
 

pico_w/wifi/freertos/httpd/pico_freertos_httpd.c

@@ -158,7 +158,7 @@ void main_task(__unused void *params) {
 #endif
 #endif
 
-    printf("\nReady, running httpd at %s\n", ip4addr_ntoa(netif_ip4_addr(netif_list)));
+    printf("\nReady, running httpd at %s\n", ip4addr_ntoa(netif_ip4_addr(netif_default)));
     httpd_init();
 
     http_set_cgi_handlers(cgi_handlers, LWIP_ARRAYSIZE(cgi_handlers));

pico_w/wifi/freertos/iperf/picow_freertos_iperf.c

@@ -79,7 +79,7 @@ void main_task(__unused void *params) {
     ip4_addr_set_u32(&clientaddr, ipaddr_addr(xstr(IPERF_SERVER_IP)));
     assert(lwiperf_start_tcp_client_default(&clientaddr, &iperf_report, NULL) != NULL);
 #else
-    printf("\nReady, running iperf server at %s\n", ip4addr_ntoa(netif_ip4_addr(netif_list)));
+    printf("\nReady, running iperf server at %s\n", ip4addr_ntoa(netif_ip4_addr(netif_default)));
     lwiperf_start_tcp_server_default(&iperf_report, NULL);
 #endif
     cyw43_arch_lwip_end();

pico_w/wifi/httpd/pico_httpd.c

@@ -203,7 +203,7 @@ int main() {
     } else {
         printf("Connected.\n");
     }
-    printf("\nReady, running httpd at %s\n", ip4addr_ntoa(netif_ip4_addr(netif_list)));
+    printf("\nReady, running httpd at %s\n", ip4addr_ntoa(netif_ip4_addr(netif_default)));
 
     // start http server
     wifi_connected_time = get_absolute_time();

pico_w/wifi/iperf/picow_iperf.c

@@ -72,7 +72,7 @@ int main() {
     ip4_addr_set_u32(&clientaddr, ipaddr_addr(xstr(IPERF_SERVER_IP)));
     assert(lwiperf_start_tcp_client_default(&clientaddr, &iperf_report, NULL) != NULL);
 #else
-    printf("\nReady, running iperf server at %s\n", ip4addr_ntoa(netif_ip4_addr(netif_list)));
+    printf("\nReady, running iperf server at %s\n", ip4addr_ntoa(netif_ip4_addr(netif_default)));
     lwiperf_start_tcp_server_default(&iperf_report, NULL);
 #endif
     cyw43_arch_lwip_end();

pico_w/wifi/lwipopts_examples_common.h

@@ -51,6 +51,7 @@
 #define LWIP_NETIF_TX_SINGLE_PBUF   1
 #define DHCP_DOES_ARP_CHECK         0
 #define LWIP_DHCP_DOES_ACD_CHECK    0
+#define LWIP_SINGLE_NETIF           1
 
 #ifndef NDEBUG
 #define LWIP_DEBUG                  1

pico_w/wifi/tcp_server/picow_tcp_server.c

@@ -187,7 +187,7 @@ static err_t tcp_server_accept(void *arg, struct tcp_pcb *client_pcb, err_t err)
 
 static bool tcp_server_open(void *arg) {
     TCP_SERVER_T *state = (TCP_SERVER_T*)arg;
-    DEBUG_printf("Starting server at %s on port %u\n", ip4addr_ntoa(netif_ip4_addr(netif_list)), TCP_PORT);
+    DEBUG_printf("Starting server at %s on port %u\n", ip4addr_ntoa(netif_ip4_addr(netif_default)), TCP_PORT);
 
     struct tcp_pcb *pcb = tcp_new_ip_type(IPADDR_TYPE_ANY);
     if (!pcb) {