Trouble getting the sensors info from units

Hello,
With the search_items request you can get sensors' properties and internal IDs.
If you want to arrange search by the prop item (e.g. unit_sensors), you need to add corresponding parameter in the request -- "propType":"propitemname"
propValueMask - should contains name or part of the name of sensor.
Here is the example: https://hst-api.wialon.com/wialon/ajax.html?svc=core/search_items&params={"spec":{"itemsType":"avl_unit","propName":"unit_sensors","propValueMask":"*New*","sortType":"sys_name","propType":"propitemname"},"force":1,"flags":4097,"from":0,"to":0}&sid=

Also, pay attention to the flags value, to get a sensors it should contains 4096.
This request respond with all units with the sensors that include "New" in their names.

In order to get sensors values from the last message, you can use 'unit/calc_last_message' request -- https://sdk.wialon.com/wiki/en/sidebar/ … st_message
You can set specific sensor ID in the array or leave it empty to get values of all sensors. 

Second option to get sensors values is 'unit/calc_sensors' request -- https://sdk.wialon.com/wiki/en/sidebar/ … lc_sensors
But this request work with the messages from loader, so you need to request messages first -- https://sdk.wialon.com/wiki/en/sidebar/ … s/messages

Regarding the connectivity - you can try to use search_items request by avl_unit with flags values 2097153 -- https://sdk.wialon.com/wiki/en/sidebar/ … connection

Good day,
Sometimes the sensor value could be invalid. In the monitoring website you can see it as the dashes (--) in the messages tab.
There could be different reason affecting such behavior. For example, the parameter used in the sensor could be missing in the messages, or the sensor configuration and calculation table specifically set to cut specific value and set them as invalid. 

As an alternative, you can try to use events to get sensors' value.
You need to add unit and sensors in the events with the 'events/update_units' request and then get the result using 'events/load' request.
Thus the sensor value will be last known valid value.
Here you can find video tutorial regarding events -- https://forum.wialon.com/viewtopic.php? … 53#p189953