// Тестировалось на Arduino IDE 1.8.7, Windows 7
#include "Wire.h"

String InString_;
String WriteByte_ = "WriteByte";
String WriteInt16_ = "WriteInt16";
String ReadByte_ = "ReadByte";
String ReadInt16_="ReadInt16";
String ReadString_="ReadString";
String INIT="";
String Function="";

byte InByte_;
byte OutByte_;
int OutInt_=0,OutIntCom_=0;
int InInt16_=0;
byte Length_=6;
char ch_;
void setup() 
{
Serial.begin(9600);  // COM Port 
Wire.begin();        // I2C
do    // connect to program
{
Serial.println("ARDUINO"); // write to COM Port
delay(500);
INIT=ReadStringCom();      // read answer
}
while(INIT != "INIT");  // connect to program
}
/////////////////////////////////////
void loop() 
{
delay(500);
if(Serial.available()>0)    //data from COM Port available
{
Function = ReadStringCom();  //read string (command) from COM Port

//delay(500);
if(Function=="WriteByte")    //  send command (byte) (0х00)
{
Function="";
delay(1000);
if(Serial.available()>0)
 { 
InByte_=(byte)(Serial.parseInt());  // read byte from COM Port
SendByte(InByte_);                  // Send byte to SM Bus
 }
}
else if(Function==ReadByte_)    //  read (byte) (0х00)
{
Function="";
OutByte_= ReadDataByte();  // read byte from SM Bus
Serial.println(OutByte_);  // Send byte to COM Port
}

else if(Function==ReadInt16_)   //  read (int16) (0х0000)
{
Function="";
OutIntCom_= ReadDataInt16();  // read int16 from SM Bus
Serial.println(OutIntCom_);   // Send int16 to COM Port
}
else if(Function==ReadString_)     //  read string( Length = (0-255))
{
Function="";
byte b=5;
//delay(500);
//b=(byte)(Serial.parseInt());      // get Length from COM Port 
Length_=b;
Function=ReadDataString(Length_); // read string from SM Bus
delay(500);
Serial.print(Function);           // write string to COM Port
}
else if(WriteInt16_==Function)     //  send (int16) (0х00)
{
Function="";
if(Serial.available()>0)
InInt16_=Serial.read();       // read int16 from COM Port
SendInt16(InInt16_);          //  send (int16) to SM Bus
} 

}// end if(Serial.available()>0)

}// end loop

///////////Functions\\\\\\\\\\\

void SendByte (byte Command_) //function send byte to SM Bus
{
Wire.beginTransmission(0x0B);
delay(100);
Wire.write(byte(Command_));
delay(100);
Wire.endTransmission();
}

void SendInt16 (int Command_) //function send int16 to SM Bus
{
Wire.beginTransmission(0x0B);
Wire.write(int(Command_));
Wire.endTransmission();
}

byte ReadDataByte() //function read byte from SM Bus
{
byte b;
Wire.beginTransmission(0x0B);
Wire.requestFrom(0x0B, 1);
b = Wire.read(); 
Wire.endTransmission(); 
return b;
}

int ReadDataInt16() //function read int16 from SM Bus
{
OutInt_=0;
int tmp=0;
Wire.beginTransmission(0x0B);
Wire.requestFrom(0x0B, 2);
tmp=Wire.read();
 delay(100);
OutInt_+=Wire.read();
OutInt_=OutInt_<<8;
OutInt_+=tmp;
Wire.endTransmission(); 
return OutInt_;
}

String ReadDataString(int Length) //function read string from SM Bus
{
String str="";
Length=5;
delay(50);
Wire.beginTransmission(0x0B);
Wire.requestFrom(0x0B, Length);
while(Length-->0)
{
str+=(char)Wire.read();
}
Wire.endTransmission();
return str; 
}

void  WriteStringCom(String OutStringCom_) //function write string to COM Port
{ 
  Serial.println(OutStringCom_);
}

void  WriteByteCom(byte OutByteCom_) //function write byte to COM Port
{
   Serial.println(OutByteCom_);
}

void  WriteInt16Com(int Out_) //function write int16 to COM Port
{  
  Serial.println(Out_);
}

String  ReadStringCom() //function read string from COM Port
{
  if(Serial.available()>0)
  {
InString_="";
while(Serial.available()>0)
InString_+=(char)Serial.read();
return InString_;
  }
}