public Short getUnitId() {
        return unitId;
    }
Get the technical address that must be used 'on the wire'
@return The address that is to be used on the wire (shifted by 1 because of the modbus spec).
plc4j/drivers/modbus/src/main/java/org/apache/plc4x/java/modbus/base/tag/ModbusTag.java