Quality values, conforming to OPC

Macros
#define	QUALITY_MASK   0xfff
	the mask for the quality variable which contains more bits than the quality number
#define	QUALITY_GOOD   0
	value good
#define	QUALITY_CONFIGURATION_ERROR   1
	value not ok because of configuration error
#define	QUALITY_NOT_CONNECTED   2
	value not ok because of connection not exist
#define	QUALITY_DEVICE_FAILURE   3
	value not pl because of device failure
#define	QUALITY_SENSOR_FAILURE   4
	value not ok because of sensor failure
#define	QUALITY_LAST_KNOWN_VALUE   5
	last known good value (for resend from cache)
#define	QUALITY_COMM_FAILURE   6
	value not ok because of connection failure. The connection does exist
#define	QUALITY_OUT_OF_SERVICE   7
	value not ok because of device is out of service
#define	QUALITY_WAITING_INITIAL_DATA   8
	no value retrieved yet
#define	QUALITY_WRITE_PROTECTED   9
	write failed because value is read only
#define	QUALITY_CORRECTED_VALUE   10
	invalid float to min or max
#define	QUALITY_MORE_TO_COME   11
	in browse lists in last entry: call more.NoElements -> next offset
#define	QUALITY_READ_PROTECTED   12
	read failed because value is not readable
#define	QUALITY_CONVERT_FAILED   13
	data conversion failed
#define	QUALITY_OVERLOAD   14
	not enough resources to handle the data
#define	QUALITY_CERTIFICATE_BAD   15
	mostly UA
#define	QUALITY_CERTIFICATE_UNTRUSTED   16
	mostly UA
#define	QUALITY_CERTIFICATE_EXPIRED   17
	mostly UA
#define	QUALITY_CERTIFICATE_CHAIN   18
	mostly UA
#define	QUALITY_CERTIFICATE_SECURITY   19
	mostly UA
#define	QUALITY_CERTIFICATE_REVOKED   20
	mostly UA
#define	QUALITY_CERTIFICATE_HOST   21
	mostly UA
#define	QUALITY_CERTIFICATE_ISSUER   22
	mostly UA
#define	QUALITY_BOUND_NOT_FOUND   23
	for historian, marks oldest/newest value
#define	QUALITY_DATA_LOST   24
	for historian, marks power off/on
#define	QUALITY_DATA_SUBNORMAL   25
	for historian, marks aggregates with bad values
#define	QUALITY_NO_DATA   100
	for user data and browsing
#define	QUALITY_WAIT   101
	request completes asynchronously; used only between app and pipe lib
#define	QUALITY_OPC_GOOD   QUALITY_GOOD
	value good

Detailed Description