Blocks Dataloger

Datalogger library

To support for datalogger functionality package metel-datalogger must be installed first.

root@iplog:~# opkg update
root@iplog:~# opkg install metel-datalogger

On the internal webpage of IPLOG is new link for datalogger.

Maximum writing rate is 100 key-value pairs per second. Minimal writing period of key-value pair is 100 ms.

Capacity for raw integer values (including bools) is 1 080 000 entries.

Capacity for raw string values is 1 080 000 entries.

Integer values are compressed to aggregation tables by seconds, minutes, hours and days. Stored are count, sum, min, max and first value for each key in given period.

Capacity of aggregation tables are 1 080 000 for seconds and minutes, 876 000 for hours and 730 000 for days.

After fill tables capacity, oldest values will be automaticaly removed.

Logging

DATALOGGER_W_BOOL

Writes binary value to datalogger

Asynchronous interface
in	KEY	string		key for logged value
in	VALUE	bool		value

DATALOGGER_W_DINT

Writes signed integer value to datalogger

Asynchronous interface
in	KEY	string		key for logged value
in	VALUE	dint		value

DATALOGGER_W_UDINT

Writes unsigned integer value to datalogger

Asynchronous interface
in	KEY	string		key for logged value
in	VALUE	udint		value

Example: Write value from resin_1 only when resin1 value is changed.

DATALOGGER_W_STRING

Writes string value to datalogger

Asynchronous interface
in	KEY	string		key for logged value
in	VALUE	string[255]		value

Example: Saving information about IPwatchdog into datalogger.