message: modify byte instead of always writing the same
diff: @@ -9,6 +9,7 @@ EXEC_NAME = "build/eeprom-tool"
  BACKUP_FILE = "backup.bin"
  ALTERED_BACKUP_FILE = "altered_backup.bin"
  READBACK_FILE = "readback.bin"
  +BYTE_TO_ALTER_INDEX = 100
  class ConnectionType(Enum):
  USB = 1
  @@ -46,11 +47,13 @@ def test_readback(connection_type):
  print("[TESTER] error while backing up content via " + connection_type.name)
  return False
  - # copy and modify alter backup file
  + # copy and modify backup file
  copyfile(BACKUP_FILE, ALTERED_BACKUP_FILE)
  with open(ALTERED_BACKUP_FILE, 'r+b') as f:
  - f.seek(5)
  - f.write(b'a')
  + f.seek(BYTE_TO_ALTER_INDEX)
  + c = f.read()[0]
  + f.seek(BYTE_TO_ALTER_INDEX)
  + f.write(bytes(c + 1))
  #write the same values
  status = run_eeprom_tool(connection_type, CommandType.WRITE, ALTERED_BACKUP_FILE)
  