Arduino sending data with checksum CRC16

Projects Programming
38

Copy and paste did not work because of the squares you can see in the picture. I have tried it several times!
No!? I am not mixing print and write. Write I use for sending the data in bytes to the other Arduino (Master) and print I have used to show it on the serial monitor as readable text to see it better for comparison.

This with the String variable I have tried to understand, but have no idea how to change that or make it with another thing. Can you help me please?

I am not really sure if it is meant this way to go with the c string example:

const byte bufferSize {10};
char serialBuffer[bufferSize+1] {""};

...

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void command(serialBuffer) {
  memset(serialBuffer, 0, sizeof serialBuffer);
  sendToUART(serialBuffer);
}


void sendToUART (buffer)
  {
  const size_t characters {strlen(buffer)};
  Serial.print("laenge: "); Serial.println(characters);

  for(byte index = 0; index < characters; index++){            //create the checksum for the array data[i] with 0 <= i <= 3
        crc16(buffer[index]);                                  //call the function crc16
      }
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