Implement dual-stack in SNMP for netconn API

src/apps/snmp/snmp_netconn.c

@@ -51,13 +51,13 @@ snmp_netconn_thread(void *arg)
   err_t err;
   LWIP_UNUSED_ARG(arg);
   
-  conn = netconn_new(NETCONN_UDP);
+  conn = netconn_new(NETCONN_UDP_IPANY);
   LWIP_ERROR("snmp_netconn: invalid conn", (conn != NULL), return;);
   
   snmp_traps_handle = conn;
   
   /* Bind to SNMP port with default IP address */
-  netconn_bind(conn, IP_ADDR_ANY, SNMP_IN_PORT);  
+  netconn_bind(conn, IP_ANY_TYPE, SNMP_IN_PORT);  
 
   do {
     err = netconn_recv(conn, &buf);