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// ----------------------------------------------
// ESP8266/ARDUINO : Relay/Relais Pin 7 
// H000 - H255     : PWM Pin 6
// DynDNS/GOIP     : Global Control (IoT)
// http://hjberndt.de/soft/ardesp8266goip.html
// ----------------------------------------------

#define LED 7 // Relais/Relay
#define SLD 6 // Helligkeit/Brightness
#define RTIME   180000 //TRIGGER ESP every  RTIME ms (3 Min)
#define RRTIME  900000 //RESTART ESP every RRTIME ms (15 Min) 
#define GOTIME  (8*RRTIME) //GOIP-Refresh 2 hour interval
#define URL "goip.de"
#define DOMAIN "GET http://www.goip.de/setip?....\r\n"

char *startup[]={"ATE0","AT+CWMODE=3","AT+CIPMUX=1",
                 "AT+CIPSERVER=1","AT+CIPSTATUS"};

unsigned long t0,t1,tg;

void espReset()
{if(analogRead(A0)==0 || millis()>(t1+RRTIME))
 {Serial.println("AT+RST");delay(2000);espReadLine(1000);
  t1=millis();}
 for(int i=0;i<5;i++)
 {Serial.println(startup[i]);espReadLine(0);}
}

void goip()
{char s[80];
 String cmd="AT+CIPCLOSE=4";// disconnect #4 if con
 Serial.println(cmd);espReadLine(0);
 cmd="AT+CIPSTART=4,\"TCP\",\"";cmd+=URL;cmd+="\",80";
 Serial.println(cmd);espReadLine(1000);
 cmd=DOMAIN;sprintf(s,"AT+CIPSEND=4,%d",cmd.length());
 Serial.println(s);  espReadLine(1000);
 Serial.print(cmd);  espReadLine(1000);
}

void setup()
{pinMode(LED,OUTPUT); Serial.begin(9600); 
 t0=millis();t1=t0;tg=t0;
 espReset();
}
 
char *espReadLine(int ms)
{char t[20],s[80]; //buffer
 if(ms)delay(ms);
 int len=Serial.readBytesUntil('\n',s,sizeof(s)-4); s[len]=0;
 return s;
}  

void loop()
{int id,len;char t[10],s[80]; 
 if(3==sscanf(espReadLine(0),"+IPD,%d,%d:%s",&id,&len,s))
 {switch (s[0])
  {case '0':digitalWrite(LED,LOW);break;
   case '1':digitalWrite(LED,HIGH);break;
   case 'H':analogWrite (SLD,(atoi(strncpy(t,&s[1],3))));break;
  }
  sprintf(s,"AT+CIPSEND=%d,12",id);// +\r\n
  Serial.println(s);espReadLine(0);// message to id
  Serial.println(digitalRead(LED)?"LED is ON ":"LED is OFF");
 }
 if(millis()>(t0+RTIME)){espReset();t0=millis();}
 if(millis()>(tg+GOTIME)){goip();tg=millis();}
}