Add setHostname() method to Ethernet.cpp

Author: Channel59

libraries/Ethernet/src/Ethernet.cpp

@@ -24,6 +24,11 @@ int arduino::EthernetClass::_begin(uint8_t *mac, unsigned long timeout, unsigned
   return (linkStatus() == LinkON ? 1 : 0);
 }
 
+int arduino::EthernetClass::setHostname(const char* hostname) {
+  eth_if->set_hostname(hostname);
+  return 1;
+}
+
 int arduino::EthernetClass::begin(uint8_t *mac, IPAddress ip) {
   IPAddress dns = ip;
   dns[3] = 1;

libraries/Ethernet/src/Ethernet.h

@@ -56,6 +56,9 @@ class EthernetClass : public MbedSocketClass {
   EthernetClass(EthernetInterface *_if)
     : eth_if(_if){};
 
+  // When using DHCP the hostname provided will be used.
+  int setHostname(const char* hostname);
+
   // Initialise the Ethernet shield to use the provided MAC address and
   // gain the rest of the configuration through DHCP.
   // Returns 0 if the DHCP configuration failed, and 1 if it succeeded