Example for Ethernet added

Author: otti

examples/Ethernet/README.md

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+# Example with Ethernet (no WIFI)
+
+LAN8720 is used as Ethernet PHY.  
+Please adjust the "ETH_xxxx" defines to fit for your hardware

examples/Ethernet/main.cpp

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+#include <ETH.h>
+#include <EspAdsLib.h>
+
+// The SrcAmsAddr can be set here. But we will change it to the current
+// IP with the function SrcAmsAddr.Change() in the setup() function
+ADS::AmsAddr SrcAmsAddr((char*)"1.1.1.1.1.1", 43609);  // Dummy
+
+// Set AMS Addr of the TwinCAT machine here
+ADS::AmsAddr DestAmsAddr((char*)"5.16.3.178.1.1", AMSPORT_R0_PLC_TC3);
+ADS::Ads Ads;
+
+// Set IP/Name of your PLC
+char IpOfPlc[] = "192.168.0.42";
+
+// Set ethernet phy configuration for your board
+#define ETH_ADDR                  1
+#define ETH_RESET                 12
+#define ETH_MDC_PIN               23
+#define ETH_MDIO_PIN              18
+#define ETH_TYPE                  ETH_PHY_LAN8720
+#define ETH_CLOCK_MODE            ETH_CLOCK_GPIO17_OUT
+
+void setup()
+{
+  String PlcIp;
+  String Ip;
+
+  // Serial
+  Serial.begin(115200);
+  Serial.println("Starting up ...");
+
+  // Ethernet
+  ETH.begin(ETH_ADDR, ETH_RESET, ETH_MDC_PIN, ETH_MDIO_PIN, ETH_TYPE, ETH_CLOCK_MODE);
+  ETH.setHostname("Hostname: ESP_ADS");
+  //ETH.config(local_ip, gateway, subnet, dns1, dns2); // Static IP, leave without this line to get IP via DHCP
+  while(!((uint32_t)ETH.localIP())){}; // Waiting for IP from DHCP
+
+  Ip = ETH.localIP().toString();
+  Serial.println("IP: " + Ip);
+
+  Ip = Ip + ".1.1";
+  SrcAmsAddr.Change((char*)Ip.c_str(), 43609);
+  Serial.println("SrcAmsAdr: " + Ip);
+
+  Ads.SetAddr(&SrcAmsAddr, &DestAmsAddr, IpOfPlc);
+  Ads.Connect();
+  Serial.println("ADS connected");
+}
+
+
+uint16_t u16MyVar = 0;
+void loop()
+{
+  Serial.println("Write PLC variable: " + String(u16MyVar));
+  Ads.WritePlcVarByName("Main.u16MyVar", &u16MyVar, sizeof(uint16_t));
+
+  Ads.ReadPlcVarByName("Main.u16MyVar", &u16MyVar, sizeof(uint16_t));
+  Serial.println("Read  PLC variable: " + String(u16MyVar));
+
+  u16MyVar++;
+  delay(2000);
+}