Parameters/get_parameters

`get_parameters`token required

Returns the latest decoded value for each telemetry parameter type recorded for a vehicle (one row per `parameter_type`).

Try in playground

POST/api— body field action.name = "get_parameters"

Parameters

Name	Type	Required	Description
`vehicle_id`	number	optional	Internal vehicle id. Either `vehicle_id` or `license_nmbr` must be supplied; missing both returns action_value '1'.e.g. `591723`
`license_nmbr`	string	optional	License plate. Aliases `license_number` and `License_NMBR` are also accepted. Either `vehicle_id` or `license_nmbr` must be supplied.e.g. `16699`
`from_date`	date	optional	Start of the time-window filter (YYYY-MM-DD, UTC day boundary). Must be paired with `to_date` — supplying only one returns action_value '1'.e.g. `2026-05-25`
`to_date`	date	optional	End of the time-window filter (YYYY-MM-DD, inclusive). Must be paired with `from_date` and be on or after it (action_value '1' otherwise).e.g. `2026-05-26`
`license_number`	string	optional	Identify the vehicle by licence plate instead of vehicle_id. Legacy spelling License_NMBR is also accepted.e.g. `16699`

Pagination

This action is paginated. The two parameters below are accepted on every call (both optional); omitting them yields page 1 with 100 rows. The response carries a pagination envelope alongside data; iterate while has_more === true.

page, page_size and has_more are present on every paginated response. total_count and total_pages are returned only by some actions — treat them as optional and drive iteration from has_more rather than from a page count worked out in advance.

Name	Type	Required	Description
`page_number`	number	optional	1-based page index. Defaults to 1 if omitted. Page 1 pins a snapshot for stateful actions (events, telemetry) — subsequent pages reuse that snapshot until the session expires (~30 minutes).e.g. `1`
`page_size`	number	optional	Rows per page. Defaults to 2000, which is also the maximum — larger values are silently capped to 2000, and a response of exactly 2000 rows usually means there are more pages. For stateful actions (events, telemetry) only the value sent with page 1 is honored, because later pages reuse the size pinned by the snapshot; stateless actions read it on every request.e.g. `2000`

Iterate every page

curl

# Iterate every page until pagination.has_more is false.
# page_size "100" is a deliberate small page so the loop is visible — the
# default is 2000, which is also the maximum. Raise it to fetch fewer,
# larger pages; you still stop on has_more either way.
# Requires: jq (https://stedolan.github.io/jq/).
page=1
while :; do
  body=$(curl -s -X POST 'https://private.develop-1.questar.io/v2/private-questar-units/api' \
    -H 'Content-Type: application/json' \
    -H 'Authorization: Bearer YOUR_TOKEN' \
    -d '{"action":{"name":"get_parameters","parameters":[{"vehicle_id":591723,"license_nmbr":"16699","from_date":"2026-05-25","to_date":"2026-05-26","license_number":"16699","page_number":"'$page'","page_size":"100"}]}}')
  echo "$body" | jq '.response.properties.data[]'
  has_more=$(echo "$body" | jq -r '.response.properties.pagination.has_more // false')
  [ "$has_more" = "true" ] || break
  page=$((page + 1))
done

Page 1 pins a snapshot for stateful actions (events, telemetry). If the session expires (~30 min) the API returns action_value="3" with description pagination_session_expired — restart from page_number=1.

Notes

action_value codes: '0' success, '1' invalid input parameters (missing identity, mismatched/invalid dates), '2' vehicle not found or not allowed for this user, '999' missing session / general error. Returns at most one row per `parameter_type` (stateless DISTINCT-ON pagination). `last_input_value` is unit-converted per the client's measuring method (Metric / Imperial / Imperial_UsGal) and formatted to 7 decimal places. `parameter_type_description` and `last_input_time` are URL-encoded on the wire.

Request

curl

curl -X POST 'https://private.develop-1.questar.io/v2/private-questar-units/api' \
  -H 'Content-Type: application/json' \
  -H 'Authorization: Bearer YOUR_TOKEN' \
  --data '{"action":{"name":"get_parameters","parameters":[{"vehicle_id":591723,"license_nmbr":"16699","from_date":"2026-05-25","to_date":"2026-05-26","license_number":"16699"}]}}'

Body

{
  "action": {
    "name": "get_parameters",
    "parameters": [
      {
        "vehicle_id": 591723,
        "license_nmbr": "16699",
        "from_date": "2026-05-25",
        "to_date": "2026-05-26",
        "license_number": "16699"
      }
    ]
  }
}

Response

Successful responses always wrap the action's payload in response.properties. The action_value field reports the handler outcome: "0" for success, "1" for invalid params, "2" for not allowed, "3" for limit-exceeded /pagination-session-expired, "999" for general error.

200 OK