Add generic IP utilities

Add:
broadcastIP() => Retrieve the network id (e.g. 192.168.0.0)
networkID() => Retrieve the broadcast IP (e.g. 192.168.0.255)
subnetCIDR() => Retrieve the subnet CIDR (e.g. 24)

Author: a7md0

libraries/WiFi/src/ETH.cpp

@@ -197,6 +197,33 @@ IPAddress ETHClass::dnsIP(uint8_t dns_no)
     return IPAddress(dns_ip.u_addr.ip4.addr);
 }
 
+IPAddress ETHClass::broadcastIP()
+{
+    tcpip_adapter_ip_info_t ip;
+    if(tcpip_adapter_get_ip_info(TCPIP_ADAPTER_IF_ETH, &ip)){
+        return IPAddress();
+    }
+    return WiFiGenericClass::calculateBroadcast(IPAddress(ip.gw.addr), IPAddress(ip.netmask.addr));
+}
+
+IPAddress ETHClass::networkID()
+{
+    tcpip_adapter_ip_info_t ip;
+    if(tcpip_adapter_get_ip_info(TCPIP_ADAPTER_IF_ETH, &ip)){
+        return IPAddress();
+    }
+    return WiFiGenericClass::calculateNetworkID(IPAddress(ip.gw.addr), IPAddress(ip.netmask.addr));
+}
+
+uint8_t ETHClass::subnetCIDR()
+{
+    tcpip_adapter_ip_info_t ip;
+    if(tcpip_adapter_get_ip_info(TCPIP_ADAPTER_IF_ETH, &ip)){
+        return (uint8_t)0;
+    }
+    return WiFiGenericClass::calculateSubnetCIDR(IPAddress(ip.netmask.addr));
+}
+
 const char * ETHClass::getHostname()
 {
     const char * hostname;

libraries/WiFi/src/ETH.h

@@ -79,6 +79,10 @@ class ETHClass {
         IPAddress gatewayIP();
         IPAddress dnsIP(uint8_t dns_no = 0);
 
+        IPAddress broadcastIP();
+        IPAddress networkID();
+        uint8_t subnetCIDR();
+
         uint8_t * macAddress(uint8_t* mac);
         String macAddress();