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nav_roi

PX4 capability domain: navigation. PX4 mapping: MAV_CMD_NAV_ROI. Sets the region of interest (ROI) for a sensor set or the vehicle itself. This can then be used by the vehicle’s control system to control the vehicle attitude and the attitude of various sensors such as cameras.

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Request Params

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vendor
string
必填
Fixed value px4
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device_id
string
必填
Target PX4 device ID
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command_type
string
必填
Fixed value nav_roi
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idempotency_key
string
必填
Idempotency key; repeated requests return the same command
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timeout_seconds
integer
Timeout in seconds, range 0~300
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payload
object
必填
Typed request payload for this command. Field names are generated from PX4 MAVLink XML labels, but callers do not send raw param1..param7 fields.
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payload.roi_mode
number
Meaning: ROI Mode, enum MAV_ROI; maps to MAVLink parameter 1 in the PX4 frame.
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payload.wp_index
number
Meaning: WP Index; maps to MAVLink parameter 2 in the PX4 frame.
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payload.roi_index
number
Meaning: ROI Index; maps to MAVLink parameter 3 in the PX4 frame.
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payload.x
number
Meaning: X; maps to MAVLink parameter 5 in the PX4 frame.
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payload.y
number
Meaning: Y; maps to MAVLink parameter 6 in the PX4 frame.
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payload.z
number
Meaning: Z; maps to MAVLink parameter 7 in the PX4 frame.

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PX4 Frame Mapping

  • MAVLink command: MAV_CMD_NAV_ROI
  • Command ID: 80
  • Default transport: COMMAND_INT
  • Source XML: common.xml
  • Completion: COMMAND_ACK
  • Guard: real PX4 downlink is disabled by default; guarded mode requires explicit authorization and a ready transport.

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Create Response

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command_id
string
Platform command ID, used for follow-up queries
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status
string
Acceptance status: ACCEPTED
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accepted_at
string(datetime)
Command acceptance time (UTC)

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Query Response

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command_id
string
Platform command ID
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status
string
Execution status: ACCEPTED / DELIVERED / SUCCEEDED / FAILED / TIMED_OUT / UNMATCHED_RESPONSE
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vendor
string
Vendor identifier; fixed value px4
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device_id
string
Target PX4 device ID
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command_type
string
PX4 command type
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response_code
string
Mapped COMMAND_ACK.result value
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response_message
string
PX4 acknowledgement summary
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vendor_response
object
Raw PX4 acknowledgement summary, including MAVLink command ID and transport

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PX4 ACK Mapping

After sending the frame, the PX4 agent waits for COMMAND_ACK and correlates the response by command id. Disabled mode sends no frame and completes with a rejected lifecycle result. 
curl -X POST "/api/v1/open/downlink/commands" \
  -H "Content-Type: application/json" \
  -H "X-Api-Id: YOUR_API_ID" \
  -H "X-Api-Timestamp: YOUR_UNIX_SECONDS" \
  -H "X-Api-Nonce: YOUR_NONCE" \
  -H "X-Api-Signature: YOUR_SIGNATURE" \
  -d "{\"vendor\":\"px4\",\"device_id\":\"px4-real-1\",\"command_type\":\"nav_roi\",\"payload\":{\"roi_mode\":0,\"wp_index\":0,\"roi_index\":0,\"x\":0,\"y\":0,\"z\":30.0},\"idempotency_key\":\"req-nav_roi-001\",\"timeout_seconds\":30}"

curl "/api/v1/open/downlink/commands/8cdb5bf3-8902-c5f7-f9aa-dc7fa0af1de0"

{
  "command_id": "8cdb5bf3-8902-c5f7-f9aa-dc7fa0af1de0",
  "status": "ACCEPTED",
  "accepted_at": "2026-06-15T00:00:00Z"
}