Fixed LWIPStack socket_sendto member to fail if interface IP4/6 version differ from destination adress IP version

Author: tymoteuszblochmobica

features/lwipstack/LWIPStack.cpp

@@ -34,6 +34,7 @@
 #include "lwip/dns.h"
 #include "lwip/udp.h"
 #include "lwip/raw.h"
+#include "lwip/netif.h"
 #include "lwip/lwip_errno.h"
 #include "lwip-sys/arch/sys_arch.h"
 
@@ -493,7 +494,16 @@ nsapi_size_or_error_t LWIP::socket_sendto(nsapi_socket_t handle, const SocketAdd
     if (!convert_mbed_addr_to_lwip(&ip_addr, &addr)) {
         return NSAPI_ERROR_PARAMETER;
     }
-
+    struct netif *netif_ = netif_get_by_index(s->conn->pcb.ip->netif_idx);
+    if (!netif_) {
+        netif_ = &default_interface->netif;
+    }
+    if (netif_) {
+        if ((addr.version == NSAPI_IPv4 && !get_ipv4_addr(netif_)) ||
+                (addr.version == NSAPI_IPv6 && !get_ipv6_addr(netif_))) {
+            return NSAPI_ERROR_PARAMETER;
+        }
+    }
     struct netbuf *buf = netbuf_new();
 
     err_t err = netbuf_ref(buf, data, (u16_t)size);