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libraries/ArduinoModbus/examples/TCP/WiFiModbusServerLED/WiFiModbusServerLED.ino

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+/*
+  WiFi Modbus TCP Server LED
+
+  This sketch creates a Modbus TCP Server with a simulated coil.
+  The value of the simulated coil is set on the LED
+
+  Circuit:
+   - MKR1000 or MKR WiFi 1010 board
+
+  created 16 July 2018
+  by Sandeep Mistry
+*/
+
+#include <SPI.h>
+#include <WiFiNINA.h> // for MKR WiFi 1010
+// #include <WiFi101.h> // for MKR1000
+
+#include <ArduinoRS485.h> // ArduinoModbus depends on the ArduinoRS485 library
+#include <ArduinoModbus.h>
+
+#include "arduino_secrets.h"
+///////please enter your sensitive data in the Secret tab/arduino_secrets.h
+char ssid[] = SECRET_SSID;        // your network SSID (name)
+char pass[] = SECRET_PASS;    // your network password (use for WPA, or use as key for WEP)
+int keyIndex = 0;                 // your network key Index number (needed only for WEP)
+
+const int ledPin = LED_BUILTIN;
+
+int status = WL_IDLE_STATUS;
+
+WiFiServer wifiServer(502);
+
+ModbusTCPServer modbusTCPServer;
+
+void setup() {
+  //Initialize serial and wait for port to open:
+  Serial.begin(9600);
+  while (!Serial) {
+    ; // wait for serial port to connect. Needed for native USB port only
+  }
+
+  Serial.println("Modbus TCP Server LED");
+
+  // attempt to connect to WiFi network:
+  while (status != WL_CONNECTED) {
+    Serial.print("Attempting to connect to SSID: ");
+    Serial.println(ssid);
+    // Connect to WPA/WPA2 network. Change this line if using open or WEP network:
+    status = WiFi.begin(ssid, pass);
+
+    // wait 10 seconds for connection:
+    delay(10000);
+  }
+
+  // you're connected now, so print out the status:
+    printWifiStatus();
+
+  // start the server
+  wifiServer.begin();
+
+  // start the Modbus TCP server
+  if (!modbusTCPServer.begin()) {
+    Serial.println("Failed to start Modbus TCP Server!");
+    while (1);
+  }
+
+  // configure the LED
+  pinMode(ledPin, OUTPUT);
+  digitalWrite(ledPin, LOW);
+
+  // configure a single coil at address 0x00
+  modbusTCPServer.configureCoils(0x00, 1);
+}
+
+void loop() {
+  // listen for incoming clients
+  WiFiClient client = wifiServer.available();
+  
+  if (client) {
+    // a new client connected
+    Serial.println("new client");
+
+    // let the Modbus TCP accept the connection 
+    modbusTCPServer.accept(client);
+
+    while (client.connected()) {
+      // poll for Modbus TCP requests, while client connected
+      modbusTCPServer.poll();
+
+      // update the LED
+      updateLED();
+    }
+
+    Serial.println("client disconnected");
+  }
+}
+
+void updateLED() {
+  // read the current value of the coil
+  int coilValue = modbusTCPServer.coilRead(0x00);
+
+  if (coilValue) {
+    // coil value set, turn LED on
+    digitalWrite(ledPin, HIGH);
+  } else {
+    // coild value clear, turn LED off
+    digitalWrite(ledPin, LOW);
+  }
+}
+
+void printWifiStatus() {
+  // print the SSID of the network you're attached to:
+  Serial.print("SSID: ");
+  Serial.println(WiFi.SSID());
+
+  // print your WiFi shield's IP address:
+  IPAddress ip = WiFi.localIP();
+  Serial.print("IP Address: ");
+  Serial.println(ip);
+
+  // print the received signal strength:
+  long rssi = WiFi.RSSI();
+  Serial.print("signal strength (RSSI):");
+  Serial.print(rssi);
+  Serial.println(" dBm");
+}