AgIsoStack-plus-plus

Do not send NAK to processed stateless messages (#679)

VTChangeNumericValueMessage wrong TAN byte. Must be byte 4 so Index change 7>3. (#677)

[VT Server]: Handle messages which do not require a connection with a working set master separately (#611)

Fixed VT4 reply to VT6 and missing TAN and Object ID

- Add setter for TC Device Element Object Type