Add generic IP calculations

Add:
calculateNetworkID(IPAddress ip, IPAddress subnet) => Calculate the network id using the ip and subnet (e.g. 192.168.0.0)
calculateBroadcast(IPAddress ip, IPAddress subnet) => Calculate the broadcast ip using the ip and subnet (e.g. 192.168.0.255)
calculateSubnetCIDR(IPAddress subnetMask) => Calculate the subnet CIDR using the subnet (e.g. 24)

Author: a7md0

libraries/WiFi/src/WiFiGeneric.cpp

@@ -656,3 +656,45 @@ int WiFiGenericClass::hostByName(const char* aHostname, IPAddress& aResult)
     return (uint32_t)aResult != 0;
 }
 
+IPAddress WiFiGenericClass::calculateNetworkID(IPAddress ip, IPAddress subnet) {
+	IPAddress networkID;
+
+	for (size_t i = 0; i < 4; i++)
+		networkID[i] = subnet[i] & ip[i];
+
+	return networkID;
+}
+
+IPAddress WiFiGenericClass::calculateBroadcast(IPAddress ip, IPAddress subnet) {
+    IPAddress broadcastIp;
+    
+    for (int i = 0; i < 4; i++)
+        broadcastIp[i] = ~subnet[i] | ip[i];
+
+    return broadcastIp;
+}
+
+uint8_t WiFiGenericClass::calculateSubnetCIDR(IPAddress subnetMask) {
+	uint8_t CIDR = 0;
+
+	for (uint8_t i = 0; i < 4; i++) {
+		if (subnetMask[i] == 0x80)  // 128
+			CIDR += 1;
+		else if (subnetMask[i] == 0xC0)  // 192
+			CIDR += 2;
+		else if (subnetMask[i] == 0xE0)  // 224
+			CIDR += 3;
+		else if (subnetMask[i] == 0xF0)  // 242
+			CIDR += 4;
+		else if (subnetMask[i] == 0xF8)  // 248
+			CIDR += 5;
+		else if (subnetMask[i] == 0xFC)  // 252
+			CIDR += 6;
+		else if (subnetMask[i] == 0xFE)  // 254
+			CIDR += 7;
+		else if (subnetMask[i] == 0xFF)  // 255
+			CIDR += 8;
+	}
+
+	return CIDR;
+}

libraries/WiFi/src/WiFiGeneric.h

@@ -108,6 +108,10 @@ class WiFiGenericClass
   public:
     static int hostByName(const char *aHostname, IPAddress &aResult);
 
+    static IPAddress calculateNetworkID(IPAddress ip, IPAddress subnet);
+    static IPAddress calculateBroadcast(IPAddress ip, IPAddress subnet);
+    static uint8_t calculateSubnetCIDR(IPAddress subnetMask);
+
   protected:
     friend class WiFiSTAClass;
     friend class WiFiScanClass;