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HTTP status: 404

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Message

No device with this ID exists in your team. List devices via GET /v1/devices first.

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Common cause

  • The device ID you used belongs to a unit that’s no longer on your team. Maybe it was removed in the dashboard, or the physical device was returned.
  • You pasted the wrong ID.
  • You used the hardware_id (the modem serial like dev:868050050000123) where the API wanted the device_id (the UUID).

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Fix

Always list devices first: 
curl -H "Authorization: Bearer $ST_API_KEY" \
  "https://api.1st.app/v1/devices"
The device_id field of each row is the value to use in /v1/devices/{device_id}/readings. If your integration runs over a long time, refresh your device list periodically (nightly is usually enough). Devices on your team can change as units are added, swapped, or removed.