LwipIntfDev - linkStatus added (#2081)

libraries/lwIP_Ethernet/src/LwipIntfDev.h

@@ -50,6 +50,11 @@
 #define DEFAULT_MTU 1500
 #endif
 
+enum EthernetLinkStatus {
+    Unknown,
+    LinkON,
+    LinkOFF
+};
 
 extern "C" void cyw43_hal_generate_laa_mac(__unused int idx, uint8_t buf[6]);
 
@@ -149,6 +154,9 @@ public:
 
     wl_status_t status();
 
+    // Arduino Ethernet compatibility
+    EthernetLinkStatus linkStatus();
+
 protected:
     err_t netif_init();
     void  check_route();
@@ -442,6 +450,11 @@ wl_status_t LwipIntfDev<RawDev>::status() {
     return _started ? (connected() ? WL_CONNECTED : WL_DISCONNECTED) : WL_NO_SHIELD;
 }
 
+template<class RawDev>
+EthernetLinkStatus LwipIntfDev<RawDev>::linkStatus() {
+    return RawDev::isLinkDetectable() ? _started && RawDev::isLinked() ? LinkON : LinkOFF : Unknown;
+}
+
 template<class RawDev>
 err_t LwipIntfDev<RawDev>::linkoutput_s(netif* netif, struct pbuf* pbuf) {
     LwipIntfDev* lid = (LwipIntfDev*)netif->state;