Serial.dumpPrint()
Dumps data as one byte hexadecimal values. For example for string "12345" the output will be "31 32 33 34 35". This function is very helpful for debug purposes.
Serial.dumpPrint(b, count)
Serial.dumpPrint(b, count, line_size)
b: Pointer to needed memory area. count: Size of area in bytes. line_size: The number of bytes in one line. By default is 10.
The number of printed symbols.