Avoid duplicate code: share code between read/write and readasync/writeasync
Avoid duplicate code: share code between read/write and readasync/writeasync

peace2048/h-opc,hylasoft-usa/h-opc,coassoftwaresystems/h-opc,coassoftwaresystems/h-opc,hylasoft-usa/h-opc,peace2048/h-opc