/* Libraries */
#include <ETH.h> //https://github.com/espressif/arduino-esp32

/* Ethernet hardware configuration */
#define ETH_PHY_TYPE    ETH_PHY_LAN8720
#define ETH_PHY_ADDR    1
#define ETH_PHY_POWER   16
#define ETH_PHY_MDC     23
#define ETH_PHY_MDIO    18
#define ETH_CLK_MODE    ETH_CLOCK_GPIO0_IN
#define ETH_RMII_TX_EN  21
#define ETH_RMII_TX0    19
#define ETH_RMII_TX1    22
#define ETH_RMII_RX_ER  13
#define ETH_RMII_RX0    25
#define ETH_RMII_RX1    26
#define ETH_RMII_CRS_DV 27

/* Ethernet settings */
const char* ethernetHostname = "WT32-ETH01";
IPAddress ethernetStaticLocalIp(192, 168, 178, 10);
IPAddress ethernetStaticGateway(192, 168, 178, 1);
IPAddress ethernetStaticSubnet(255, 255, 0, 0);
IPAddress ethernetStaticPrimaryDns(8, 8, 8, 8);   //DNS 1 optional
IPAddress ethernetStaticSecondaryDns(8, 8, 4, 4); //DNS 2 optional

/* Variables */
static bool ethernetConnected = false;

void setup() {
  /* Initialize UART */
  Serial.begin(115200);

  /* Initialize Ethernet */
  Network.onEvent(onNetworkEvent);
  ETH.begin(ETH_PHY_TYPE,\
            ETH_PHY_ADDR,\
            ETH_PHY_MDC,\
            ETH_PHY_MDIO,\
            ETH_PHY_POWER,\
            ETH_CLK_MODE);
  //ETH.config(); //use DHCP
  ETH.config(ethernetStaticLocalIp,\
             ethernetStaticGateway,\
             ethernetStaticSubnet,\
             ethernetStaticPrimaryDns,\
             ethernetStaticSecondaryDns); //use static IP
}

void loop() {
  /* Print Ethernet information */
  Serial.println("- - -");

  Serial.print("Ethernet MAC: ");
  Serial.println(ETH.macAddress());

  Serial.print("Ethernet ");
  Serial.println(ETH.connected() ? "connected" : "not connected");

  Serial.print("Ethernet ");
  Serial.println(ETH.linkUp() ? "link up" : "no link");

  Serial.print("Ethernet ");
  Serial.println(ETH.fullDuplex() ? "full duplex" : "half duplex");
  
  Serial.print("Speed: ");
  Serial.print(ETH.linkSpeed());
  Serial.println(" MBit/s");

  if (ETH.hasIP()) {
    Serial.print("Ethernet local IP: ");
    Serial.println(ETH.localIP());
  }
  else {
    Serial.println("No Ethernet IP");
  }

  if (ethernetConnected) {
    Serial.println(ETH);
  }

  delay(10000); //delay 10 s
}

// WARNING: function is called from another FreeRTOS task (thread)!
void onNetworkEvent(arduino_event_id_t event) {
  switch (event) {
    case ARDUINO_EVENT_ETH_START:
      Serial.println("Event: Ethernet started");
      ETH.setHostname(ethernetHostname);
      break;
    case ARDUINO_EVENT_ETH_CONNECTED:
      Serial.println("Event: Ethernet connected");
      break;
    case ARDUINO_EVENT_ETH_GOT_IP:
      Serial.println("Event: Ethernet got IP");
      ethernetConnected = true;
      break;
    case ARDUINO_EVENT_ETH_LOST_IP:
      Serial.println("Event: Ethernet lost IP");
      ethernetConnected = false;
      break;
    case ARDUINO_EVENT_ETH_DISCONNECTED:
      Serial.println("Event: Ethernet disconnected");
      ethernetConnected = false;
      break;
    case ARDUINO_EVENT_ETH_STOP:
      Serial.println("Event: Ethernet stopped");
      ethernetConnected = false;
      break;
    default: break;
  }
}