Not Receiving Specific Messages in MQTT Subscription

[oddbjorn-larsen]

Description:
I am trying to receive values such as zoom_factor and recording_state for a Matrice 300 RTK with an H20T camera using the latest DJI Cloud API. Despite subscribing to all possible topics, I am not receiving messages related to changes in zoom factor or camera mode.

Configuration:

I have configured my cloud-sdk to subscribe to all potential topics:

cloud-sdk:
  mqtt:
    # Topics that need to be subscribed when initially connecting to mqtt, multiple topics are divided by ",".
    inbound-topic: sys/product/+/status,thing/product/+/requests,thing/product/+/response,thing/product/+/events,thing/product/+/commands,thing/product/+/osd,thing/product/+/state,thing/product/+/services,thing/product/+/services_reply,thing/product/+/events_reply,thing/product/+/requests_reply,thing/product/+/property/set,thing/product/+/property/set_reply,thing/product/+/drc/up,thing/product/+/drc/down

Steps Taken:

1. Subscribed to the following topics:

   • sys/product/+/status
   • thing/product/+/requests
   • thing/product/+/response
   • thing/product/+/events
   • thing/product/+/commands
   • thing/product/+/osd
   • thing/product/+/state
   • thing/product/+/services
   • thing/product/+/services_reply
   • thing/product/+/events_reply
   • thing/product/+/requests_reply
   • thing/product/+/property/set
   • thing/product/+/property/set_reply
   • thing/product/+/drc/up
   • thing/product/+/drc/down

2. Built a custom frontend and monitored messages in the cloud_api_sample container.

3. Ensured the device configuration is supposed to push updates on relevant changes.

Problem:
No messages are received when changing the zoom factor or switching the camera mode. I expect to see messages for these events in the subscribed topics but the logs are empty for these specific changes.

Questions:

1. Do I need to set specific properties to pushMode=1 for these messages to be sent?
2. Is there any additional configuration required on the device or in the DJI Cloud API to receive these specific messages?
3. Could there be a delay or another reason for these messages not appearing in the MQTT logs?

Environment:

• Device: Matrice 300 RTK / H20T
• API Version: 1.10.0 DJI Cloud API
• MQTT Broker: Configured with EMQX Broker

[darius-luca-tech]

Hi there,

I am currently facing the EXACT same problem as you do...Do you managed to find a proper fix for it?

Luca

[Sanafan]

Gleiches Problem hier...

Same Problem here...

[oddbjorn-larsen]

It seems like this is a limitation in the DJI Pilot 2 app. And that such fields are only available when using the DJI Dock system.

My question to DJI SDK devs:
To clarify: Are you saying that camera fields like zoom_factor and recording_state are only available when using DJI Dock systems, and not through DJI Pilot 2 with Cloud API? If so:

1. Is this a permanent limitation of Pilot 2?
2. Are there any plans to support these camera fields in future Cloud API versions?
3. Is there any alternative way to monitor camera zoom level and recording status when using Pilot 2?

We're trying to build monitoring functionality for our H20T camera operations and this information is important for our use case

The response:

Dear developers,

Hello, thank you for contacting DJI Innovation.

Yes, by design
There is no support plan
Sorry, except for reporting, there is no other API to monitor

I hope our solution can help you, thank you for your email, wish you a happy life!

Best Regards,
Dji innovation SDK technical support

[oddbjorn-larsen]

Tested the same code on another drone, the M350 with the H30T gimbal and now we get a lot more data:

Received Message on DJI Cloud API (osd)

{
  "bid": "00000000-0000-0000-0000-000000000000",
  "data": {
    "83-0-0": {
      "gimbal_pitch": 19.7,
      "gimbal_roll": 0,
      "gimbal_yaw": 162.3,
      "payload_index": "83-0-0",
      "thermal_current_palette_style": 0,
      "thermal_gain_mode": 3,
      "thermal_global_temperature_max": 0,
      "thermal_global_temperature_min": 0,
      "thermal_isotherm_lower_limit": 0,
      "thermal_isotherm_state": 0,
      "thermal_isotherm_upper_limit": 0
    },
    "activation_time": 1694424117,
    "attitude_head": 83.5,
    "attitude_pitch": 0,
    "attitude_roll": -0.2,
    "battery": {
      "batteries": [
        {
          "capacity_percent": 95,
          "firmware_version": "09.03.00.48",
          "high_voltage_storage_days": 7,
          "index": 0,
          "loop_times": 2,
          "sn": "XXXX",
          "sub_type": 0,
          "temperature": 20.1,
          "type": 0,
          "voltage": 50064
        },
        {
          "capacity_percent": 95,
          "firmware_version": "09.03.00.48",
          "high_voltage_storage_days": 7,
          "index": 1,
          "loop_times": 2,
          "sn": "XXXX",
          "sub_type": 0,
          "temperature": 19.8,
          "type": 0,
          "voltage": 50062
        }
      ],
      "capacity_percent": 95,
      "landing_power": 5,
      "remain_flight_time": 0,
      "return_home_power": 10
    },
    "cameras": [
      {
        "camera_mode": 1,
        "ir_metering_mode": 0,
        "ir_metering_point": {
          "temperature": 0,
          "x": 0.5,
          "y": 0.5
        },
        "ir_zoom_factor": 1,
        "liveview_world_region": {
          "bottom": 0.571290671825409,
          "left": 0.39357402920722961,
          "right": 0.59680604934692383,
          "top": 0.42799901962280273
        },
        "payload_index": "83-0-0",
        "photo_state": 0,
        "record_time": 0,
        "recording_state": 0,
        "remain_photo_num": 0,
        "remain_record_duration": 4964,
        "screen_split_enable": false,
        "wide_calibrate_farthest_focus_value": 31,
        "wide_calibrate_nearest_focus_value": 59,
        "wide_exposure_mode": 1,
        "wide_exposure_value": 16,
        "wide_focus_mode": 2,
        "wide_focus_state": 0,
        "wide_focus_value": 34,
        "wide_iso": 4,
        "wide_max_focus_value": 59,
        "wide_min_focus_value": 31,
        "wide_shutter_speed": 5,
        "zoom_calibrate_farthest_focus_value": 162,
        "zoom_calibrate_nearest_focus_value": 333,
        "zoom_exposure_mode": 1,
        "zoom_exposure_value": 16,
        "zoom_factor": 13,
        "zoom_focus_mode": 2,
        "zoom_focus_state": 0,
        "zoom_focus_value": 254,
        "zoom_iso": 3,
        "zoom_max_focus_value": 433,
        "zoom_min_focus_value": 62,
        "zoom_shutter_speed": 17
      }
    ],
    "distance_limit_status": {
      "distance_limit": 0,
      "is_near_distance_limit": 0,
      "state": 0
    },
    "elevation": 0,
    "exit_wayline_when_rc_lost": 0,
    "firmware_version": "10.01.0805",
    "gear": 1,
    "height": 39.472785949707031,
    "height_limit": 0,
    "home_distance": 11.698485374450684,
    "horizontal_speed": 0,
    "is_near_height_limit": 0,
    "latitude": 15.267876161133515,
    "longitude": 12.522343969611,
    "maintain_status": {
      "maintain_status_array": [
        {
          "last_maintain_flight_sorties": 0,
          "last_maintain_flight_time": 0,
          "last_maintain_time": 0,
          "last_maintain_type": 1,
          "state": 0
        },
        {
          "last_maintain_flight_sorties": 0,
          "last_maintain_flight_time": 0,
          "last_maintain_time": 0,
          "last_maintain_type": 2,
          "state": 0
        },
        {
          "last_maintain_flight_sorties": 0,
          "last_maintain_flight_time": 0,
          "last_maintain_time": 0,
          "last_maintain_type": 3,
          "state": 0
        }
      ]
    },
    "mode_code": 0,
    "night_lights_state": 0,
    "obstacle_avoidance": {
      "downside": 0,
      "horizon": 1,
      "upside": 0
    },
    "position_state": {
      "gps_number": 20,
      "is_fixed": 0,
      "quality": 5,
      "rtk_number": 36
    },
    "rc_lost_action": 2,
    "rth_altitude": 100,
    "storage": {
      "total": 60382000,
      "used": 23000
    },
    "total_flight_distance": 27765.1351380992,
    "total_flight_sorties": 0,
    "total_flight_time": 0,
    "track_id": "",
    "vertical_speed": 0,
    "wind_direction": 0,
    "wind_speed": 0
  },
  "tid": "00000000-0000-0000-0000-000000000000",
  "timestamp": 1740047361674,
  "gateway": "XXXX"
}