Added broadcastIP method to WiFiSTA class (#7899)

Author: drzony

Diff for: libraries/ESP8266WiFi/src/ESP8266WiFiSTA.cpp

@@ -504,6 +504,18 @@ IPAddress ESP8266WiFiSTAClass::dnsIP(uint8_t dns_no) {
     return IPAddress(dns_getserver(dns_no));
 }
 
+/**
+ * Get the broadcast ip address.
+ * @return IPAddress Bradcast IP
+ */
+IPAddress ESP8266WiFiSTAClass::broadcastIP()
+{
+    struct ip_info ip;
+    wifi_get_ip_info(STATION_IF, &ip);
+
+    return IPAddress(ip.ip.addr | ~(ip.netmask.addr));
+}
+
 /**
  * Return Connection status.
  * @return one of the value defined in wl_status_t

Diff for: libraries/ESP8266WiFi/src/ESP8266WiFiSTA.h

@@ -70,6 +70,7 @@ class ESP8266WiFiSTAClass: public LwipIntf {
         IPAddress gatewayIP();
         IPAddress dnsIP(uint8_t dns_no = 0);
 
+        IPAddress broadcastIP();
         // STA WiFi info
         wl_status_t status();
         String SSID() const;