not able to send new data about arduino HOT 1 OPEN

Hi archiene,

It's been a couple of months, but I have a possible answer to your question, if I undrstood it correctly.
If you check the code, in the Loop() function, in the following lines:

memcpy(com_buffer, msg, 11); // size of variable msg. In this case, 11.
 com_buffer[11] = i + '0' ; /
 if(write(com_buffer, 12) < 0){
      delay(10);
 }else{

You can see that in memcpy, the size is 11. That's because the variable msg holds the value "Hello World", which contains 11 characters.
If you want to change the message, remember to change the size in this piece of code as well. For example, if you want to send "Hello" (5 characters), the code should be as follows:

memcpy(com_buffer, msg, 5); 
 com_buffer[5] = i + '0' ; 
 if(write(com_buffer, 6) < 0){ 
      delay(10);
 }else{

I hope this answer is useful somehow, and sorry about possible English errors.

from arduino.