Env_Serial_OPC.ino

#include <OPC.h>
#include <Bridge.h>
#include <SPI.h>
#include <Wire.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_BME280.h>

OPCSerial myArduinoMEGA;

opcAccessRights analog_status_input[1];


#define SEALEVELPRESSURE_HPA (1013.25)


Adafruit_BME280 bme; //I2C

float callbackTemperature(const char *itemID, const opcOperation opcOP, const float value){
  return bme.readTemperature();
}
float callbackPressure(const char *itemID, const opcOperation opcOP, const float value){
  return (bme.readPressure()/ 100.0F);
}
float OPCoperation(const char *itemID, const opcOperation opcOP, const float value){
  return 1;
}
float callbackHumidity(const char *itemID, const opcOperation opcOP, const float value){
  return bme.readHumidity();
}

int readwrite_analog(const char *itemID, const opcOperation opcOP, const int value) 
{
  byte port;
    
  OPCItemType aOPCItem = myArduinoMEGA.getOPCItem(itemID);                     

  port = atoi(&itemID[1]);
           
  if (opcOP == opc_opread) {
    if ((aOPCItem.opcAccessRight == opc_read) || (aOPCItem.opcAccessRight == opc_readwrite)) {
      
      if (analog_status_input[port] != opc_read) {
        pinMode(port, INPUT);
        analog_status_input[port] = opc_read;
      }
    
      return analogRead(port);
    }
  } 
  
}


const int LED=53;

void setup() {
pinMode(LED,OUTPUT); 

  bool status;

  bme.begin();

   if (! bme.begin()) {
        while (1);
    }
  Serial.begin(9600);
  myArduinoMEGA.setup(); 
  myArduinoMEGA.addItem("BME280.Temperature",opc_read, opc_float, callbackTemperature);
  myArduinoMEGA.addItem("BME280.Pressure",opc_read, opc_float, callbackPressure);
  myArduinoMEGA.addItem("BME280.Humidity",opc_read, opc_float, callbackHumidity);
  myArduinoMEGA.addItem("BME280.ArduinoOperation",opc_read, opc_float, OPCoperation);
  myArduinoMEGA.addItem("A0",opc_read, opc_int, readwrite_analog);



}

void loop() {
  digitalWrite(LED,millis()/1024%2);
  myArduinoMEGA.processOPCCommands();
}