stm32: Support optional lwIP mDNS responder.

ports/stm32/main.c

@@ -39,6 +39,7 @@
 
 #if MICROPY_PY_LWIP
 #include "lwip/init.h"
+#include "lwip/apps/mdns.h"
 #include "drivers/cyw43/cyw43.h"
 #endif
 
@@ -479,6 +480,9 @@ void stm32_main(uint32_t reset_mode) {
     // because the system timeout list (next_timeout) is only ever reset by BSS clearing.
     // So for now we only init the lwIP stack once on power-up.
     lwip_init();
+    #if LWIP_MDNS_RESPONDER
+    mdns_resp_init();
+    #endif
     systick_enable_dispatch(SYSTICK_DISPATCH_LWIP, mod_network_lwip_poll_wrapper);
     #endif
 

ports/stm32/modnetwork.c

@@ -44,6 +44,7 @@
 #include "lwip/timeouts.h"
 #include "lwip/dns.h"
 #include "lwip/dhcp.h"
+#include "lwip/apps/mdns.h"
 #include "extmod/network_cyw43.h"
 #include "drivers/cyw43/cyw43.h"
 
@@ -188,6 +189,10 @@ mp_obj_t mod_network_nic_ifconfig(struct netif *netif, size_t n_args, const mp_o
             mp_hal_delay_ms(100);
         }
 
+        #if LWIP_MDNS_RESPONDER
+        mdns_resp_netif_settings_changed(netif);
+        #endif
+
         return mp_const_none;
     } else {
         // Release and stop any existing DHCP
@@ -202,6 +207,9 @@ mp_obj_t mod_network_nic_ifconfig(struct netif *netif, size_t n_args, const mp_o
         ip_addr_t dns;
         netutils_parse_ipv4_addr(items[3], (uint8_t*)&dns, NETUTILS_BIG);
         dns_setserver(0, &dns);
+        #if LWIP_MDNS_RESPONDER
+        mdns_resp_netif_settings_changed(netif);
+        #endif
         return mp_const_none;
     }
 }