Added example for ESP8266

Author: flouk19

examples/modbusTCPlib_esp8266/modbusTCPlib_esp8266.ino

@@ -0,0 +1,116 @@
+/*
+  This is Modbus test code to demonstrate all the Modbus functions with
+  with Ethernet IC WIZNET W5100
+
+  ModbusTCP is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  ModbusTCP is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with ModbusTCP.  If not, see <http://www.gnu.org/licenses/>.
+
+  Adopted from ModbusMaster for RTU over RS-485 by Doc Walker
+  Modified by Narendra Dehury for TCP.
+  Modified by Florian K for ESP8266.
+  copyright @ phoenixrobotix.com
+
+*/
+#define ESP8266 1
+
+unsigned int param_value_int[7];
+#include <Ethernet.h>
+
+IPAddress ModbusDeviceIP(10, 10, 108, 211);  // Put IP Address of PLC here
+IPAddress moduleIPAddress(10, 10, 108, 23);  // Assign Anything other than the PLC IP Address
+
+byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xE1 };
+
+
+#include <ModbusTCP.h>
+
+ModbusTCP node(1);                            // Unit Identifier.
+
+void setup()
+{
+
+  pinMode(4, OUTPUT);
+  digitalWrite(4, HIGH);                      // To disable slave select for SD card; depricated.
+
+  Serial.begin(9600);
+  delay(1000);
+  Ethernet.begin(mac, moduleIPAddress);
+  node.setServerIPAddress(ModbusDeviceIP);
+  delay(6000);                                // To provide sufficient time to initialize.
+
+}
+
+
+void loop()
+{
+  uint8_t result;
+
+  node.setTransactionID(random(100));           // Not necessary; but good to distinguish each frame individually.
+  result = node.readHoldingRegisters(1, 12);    // Read Holding Registers
+
+  Serial.println(result, HEX);
+  if(result != 0)
+  {
+    Serial.println("TimeOut");
+
+    delay(6000);
+  }
+
+  int len = node.getResponseBufferLength();
+  Serial.println("Response Length: " + String(len));// See the length of data packet received.
+  for (byte j = 0; j < len; j++)
+  {
+    Serial.print(node.getResponseBuffer(j));       // Inspect the data.
+    Serial.print(" ");
+  }
+  Serial.println();
+  node.clearResponseBuffer();
+  delay(100);
+
+
+
+
+  node.writeSingleRegister(5, 3);                  // Write single register
+  Serial.println(result, HEX);
+  delay(500);
+
+
+
+  for (byte i = 0; i < 5; i++)
+  {
+    node.setTransmitBuffer(i, (i+100));
+  }
+  node.writeMultipleRegisters(2, 5);               // Write multiple register
+  Serial.println(result, HEX);
+  delay(500);
+
+
+
+  node.writeSingleCoil(20, 1);                     // Write Single coil
+  delay(500);
+
+
+
+  node.setTransmitBuffer(0, 0b1010101001010101);
+
+  node.writeMultipleCoils(20, 16);                 // Write multiple coils
+  delay(500);
+  result = node.readCoils(20, 18);
+  len = node.getResponseBufferLength();
+  Serial.println("Response Length: " + String(len));
+  Serial.println(node.getResponseBuffer(0), BIN);
+
+
+  node.clearResponseBuffer();
+  delay(5000);
+}