DNS server IP getter dnsIP()

src/WiFi.cpp

@@ -266,6 +266,16 @@ IPAddress WiFiClass::gatewayIP()
 	return ret;
 }
 
+IPAddress WiFiClass::dnsIP(int n)
+{
+  if (n > 1)
+    return IPAddress(0,0,0,0);
+  IPAddress dnsip0;
+  IPAddress dnsip1;
+  WiFiDrv::getDNS(dnsip0, dnsip1);
+  return n ? dnsip1 : dnsip0;
+}
+
 const char* WiFiClass::SSID()
 {
     return WiFiDrv::getCurrentSSID();

src/WiFi.h

@@ -178,6 +178,14 @@ class WiFiClass
      */
    IPAddress gatewayIP();
 
+   /*
+    * Get the DNS server IP address.
+    * param n: index of the DNS server
+    * return: DNS server IP address value
+    * requires firmware version > 1.5.0
+    */
+   IPAddress dnsIP(int n = 0);
+
     /*
      * Return the current SSID associated with the network
      *

src/utility/wifi_drv.cpp

@@ -418,6 +418,39 @@ void WiFiDrv::getIpAddress(IPAddress& ip)
 	ip = _gatewayIp;
  }
 
+ void WiFiDrv::getDNS(IPAddress& dnsip0, IPAddress& dnsip1)
+ {
+   uint8_t ip0[WL_IPV4_LENGTH] = {0};
+   uint8_t ip1[WL_IPV4_LENGTH] = {0};
+
+   tParam params[PARAM_NUMS_2] = { {0, (char*)ip0}, {0, (char*)ip1}};
+
+   WAIT_FOR_SLAVE_SELECT();
+
+   // Send Command
+   SpiDrv::sendCmd(GET_DNS_CONFIG_CMD, PARAM_NUMS_1);
+
+   uint8_t _dummy = DUMMY_DATA;
+   SpiDrv::sendParam(&_dummy, sizeof(_dummy), LAST_PARAM);
+
+   // pad to multiple of 4
+   SpiDrv::readChar();
+   SpiDrv::readChar();
+
+   SpiDrv::spiSlaveDeselect();
+   //Wait the reply elaboration
+   SpiDrv::waitForSlaveReady();
+   SpiDrv::spiSlaveSelect();
+
+   // Wait for reply
+   SpiDrv::waitResponseParams(GET_DNS_CONFIG_CMD, PARAM_NUMS_2, params);
+
+   SpiDrv::spiSlaveDeselect();
+
+   dnsip0 = ip0;
+   dnsip1 = ip1;
+ }
+
 const char* WiFiDrv::getCurrentSSID()
 {
 	WAIT_FOR_SLAVE_SELECT();

src/utility/wifi_drv.h

@@ -181,6 +181,13 @@ class WiFiDrv
      */
     static void getGatewayIP(IPAddress& ip);
 
+    /*
+     * Get the DNS servers IP addresses.
+     *
+     * return: copy the DNS servers IP addresses into IPAddress objects
+     */
+    static void getDNS(IPAddress& dnsip0, IPAddress& dnsip1);
+
     /*
      * Return the current SSID associated with the network
      *

src/utility/wifi_spi.h

@@ -56,6 +56,7 @@ enum {
 	SET_AP_PASSPHRASE_CMD = 0x19,
 	SET_DEBUG_CMD		= 0x1A,
 	GET_TEMPERATURE_CMD = 0x1B,
+	GET_DNS_CONFIG_CMD = 0x1E,
 	GET_REASON_CODE_CMD = 0x1F,
 
 	GET_CONN_STATUS_CMD	= 0x20,