Add patch for Ethernet2 library

Add patch for Ethernet2 library to provide link status function link(), similar to Ethernet3

Author: khoih-prog

LibraryPatches/Ethernet2/src/Ethernet2.cpp

@@ -210,6 +210,21 @@ int EthernetClass::maintain(){
   return rc;
 }
 
+// KH add to report link status
+uint8_t EthernetClass::link() 
+{
+  return bitRead(w5500.getPHYCFGR(), 0);
+}
+
+const char* EthernetClass::linkReport() 
+{
+  if (bitRead(w5500.getPHYCFGR(), 0) == 1) 
+    return "LINK";
+  else 
+    return "NO LINK";
+}
+//////
+
 IPAddress EthernetClass::localIP()
 {
   IPAddress ret;

LibraryPatches/Ethernet2/src/Ethernet2.h

@@ -62,6 +62,11 @@ class EthernetClass {
 #endif
 
   int maintain();
+  
+  // KH add to report link status
+  uint8_t       link();           // returns the linkstate, 1 = linked, 0 = no link
+  const char*   linkReport();     // returns the linkstate as a string
+  //////
 
   // KH add to have similar function to Ethernet lib
   // Certainly we can use void macAddress(uint8_t mac[]) to read from W5x00.