cod esp8266

  • boolean setup_ESP(){//returns a ‘1’ if successful
     
      ESP8266.print(“ATrn”);// Send just ‘AT’ to make sure the ESP is responding
      //this read_until_… function is used to find a keyword in the ESP response – more on this later and in the function itself
      if(read_until_ESP(keyword_OK,sizeof(keyword_OK),5000,0))//go look for keyword “OK” with a 5sec timeout
        Serial.println(“ESP CHECK OK”);
      else
        Serial.println(“ESP CHECK FAILED”);
      serial_dump_ESP();//this just reads everything in the buffer and what’s still coming from the ESP

       ESP8266.print(“AT+RSTrn”);// Give it a reset – who knows what condition it was in, better to start fresh
      if(read_until_ESP(keyword_OK,sizeof(keyword_OK),5000,0))//go look for keyword “Ready” – takes a few seconds longer to complete
        Serial.println(“ESP RESET OK”);//depneding on the FW version on the ESP, sometimes the Ready is with a lowercase r – ready
      else
        Serial.println(“ESP RESET FAILED”);
      serial_dump_ESP();

     
       ESP8266.print(“AT+CWMODE=”);// set the CWMODE
       ESP8266.print(CWMODE);//just send what is set in the constant
       ESP8266.print(“rn”);
      if(read_until_ESP(keyword_OK,sizeof(keyword_OK),5000,0))//go look for keyword “OK”
        Serial.println(“ESP CWMODE SET”);
      else
        Serial.println(“ESP CWMODE SET FAILED”); //probably going to fail, since a ‘no change’ is returned if already set – would be nice to check for two words
      serial_dump_ESP(); 
      
       //Here’s where the SSID and PW are set
       ESP8266.print(“AT+CWJAP=””);// set the SSID AT+CWJAP=”SSID”,”PW”
       ESP8266.print(SSID_ESP);//from constant
       ESP8266.print(“”,””);
       ESP8266.print(SSID_KEY);//form constant
       ESP8266.print(“”rn”);
      if(read_until_ESP(keyword_OK,sizeof(keyword_OK),10000,0))//go look for keyword “OK”
        Serial.println(“ESP SSID SET OK”);
      else
        Serial.println(“ESP SSID SET FAILED”);  
      serial_dump_ESP();
     
      //This checks for and stores the IP address
      Serial.println(“CHECKING FOR AN IP ADDRESS”);
      ESP8266.print(“AT+CIFSRrn”);//command to retrieve IP address from ESP
      if(read_until_ESP(keyword_rn,sizeof(keyword_rn),10000,0)){//look for first rn after AT+CIFSR echo – note mode is ‘0’, the ip address is right after this
      if(read_until_ESP(keyword_rn,sizeof(keyword_rn),1000,1)){//look for second rn, and store everything it receives, mode=’1′
        //store the ip adress in its variable, ip_address[]
        for(int i=1; i<=(scratch_data_from_ESP[0]-sizeof(keyword_rn)+1); i++)//that i<=… is going to take some explaining, see next lines
           ip_address[i] = scratch_data_from_ESP[i];//fill up ip_address with the scratch data received
    //i=1 because i=0 is the length of the data found between the two keywords, BUT this includes the length of the second keyword, so i<= to the length minus
    //size of teh keyword, but remember, sizeof() will return one extra, which is going to be subtracted, so I just added it back in +1
        ip_address[0] = (scratch_data_from_ESP[0]-sizeof(keyword_rn)+1);//store the length of ip_address in [0], same thing as before
        Serial.print(“IP ADDRESS = “);//print it off to verify
        for(int i=1; i<=ip_address[0]; i++)//send out the ip address
        Serial.print(ip_address[i]);
        Serial.println(“”);
      }}//if first rn
      else
      Serial.print(“IP ADDRESS FAIL”);
      serial_dump_ESP();

       ESP8266.print(“AT+CIPMUX=”);// set the CIPMUX
       ESP8266.print(CIPMUX);//from constant
       ESP8266.print(“rn”);
      if(read_until_ESP(keyword_OK,sizeof(keyword_OK),5000,0))//go look for keyword “OK” or “no change
        Serial.println(“ESP CIPMUX SET”);
      else
        Serial.println(“ESP CIPMUX SET FAILED”);
      serial_dump_ESP();

     //that’s it!  Could be done by nesting everything together, so if one thing fails, it returns ‘0’, and if it gets all the way through it returns ‘1’…oh well
     
     
    }//setup ESP

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