hhamedk hello, sorry for the delay.
The update_data_flags allows to control the changes applied in any item in the system.
For example, you can add all units there with "avl_unit" value for "data" parameter and with "avl_evts" request execution control the changes in the unit's properties or last known location.
The type of changes that you want to control can be regulated with flags values, same that used for search_items request.
For example, if you want to control location update, you can try to use following request parameters:
Then you can execute hst-api.wialon.com/avl_evts?sid= to check for any updates.
The sample of the executions by steps -- https://sdk.wialon.com/wiki/en/sidebar/ … datafalags
But this request can control only parameters values changes and not the sensor values.
For the sensors you can use update_units request and add required units there to control sensors, trips, counters changes. check_updates request will show the result.
Here you can find video tutorial with the events description -- https://youtu.be/nUtNS5Al5wo
So, in general, you can try to use both these requests to get required information - update location and sensor values.
Or use 'load_last' request to get location and events for the sensors.
P.S. to get 24/7 support you can also provide your request to email@example.com
Technical Care Engineer (L2)