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This feature is end of life starting with Site Controller version 3.0. |
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| IntroductionThe SiteController is actually intended to send acquired sensor data and other information to cloud as fast as possible. But if an upload of the data is not possible or not intended, for instance by the configuration of the SiteController, the collected sensor data are stored locally until a connection to the cloud is established. The USB data export procedure is supported by the visualization using one LED at the azeti-machina NEXCOM NIFE103. Neither a keypad nor a monitor are required. | Note |
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SiteController is regularly uploading data to the azeti Cloud if it has an active cloud connection. You'll only see data if there was a period of offline time. |
This document describes how to configure the SiteController to force the local storage of data and how to retrieve the collected data offline to a prepared USB flash drive. Furthermore is added, how these data on the USB flash drive could be used. |
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| cql | label = "data_store" |
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| title | Offline data storage and USB export relevant settings in the SiteController.cfg |
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[ExternalBroker]
# left empty to guarantee the offline storage
host=
port=1883
# not required with no connection
user_id=
password=
# an organizationShortName is still required
organizationShortName=my_org
tls_enable=False
[data_store]
# this password must be equal to the password at the USB flash drive
L2_export_password=P@s$w0rd!
# required for the USB data export
export_status_representation=sensor
export_status_sensor_id=usb_export_state
# -1 means no limitation by the table based size limits
L2_max_imgdata=-1
L2_max_sys_msg=-1
L2_max_events=-1
L2_max_HD=-1
# limitations to the offline storage
L2_max_age_days=183
L2_max_total_size_MiB=1024
L2_time_of_day_to_cleanup=02:00
# Optimization to have permanently more data in L2.
# !!! Following 2 lines should be deleted if the SiteController is going to operate online !!!
max_items_L1 = 500
L1_max_sys_msg = 50
[SiteController.conf]
# required for the USB export
start_usb_exporter=Yes
[remote_exec_calls]
# required for the export process visualization using the LED
led_on=/usr/local/bin/led.on
led_off=/usr/local/bin/led.off |
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Following configuration lines in the SiteController.cfg are optional: | Code Block |
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| # Optimization to have permanently more data in L2.
# !!! Following 2 lines should be deleted if the SiteController is going to operate online !!!
max_items_L1 = 500
L1_max_sys_msg = 50 |
With these settings new data are moved much earlier to the L2 database file and available for USB storage. More latest data are available to get copied. On the other hand these settings are not sufficient for the online mode, when the SiteController is connected to cloud. In this case the L2 database should be accessed as less as possible. With more L1 cache space the data can be better combined and uploaded. If the lines are not present in the SiteController.cfg, the default is used (15000,5000). |
Site template
The control of the LED for the visualization of the USB export process is completely realized by configuration of the SiteController. For this purpose, the site template of the SiteController should (also) inherit a component template like the following one:
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