ColdChainFleet reference stack

Bench test

Pending bench test — Validation status.

Fleet dashboard for cold rooms / reefers. Device type: cold_chain.

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Telemetry contract

Key	Unit	Notes
temperature	°C	Reefer band (about −22…−14), not room ambient
humidity	%RH	Cold storage humidity
door_open	boolean	true when door open

Sample data uses sub-zero nominal band with brief warm spikes (door open / defrost scenarios).

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Reference hardware (pending bench test)

Item	Detail
Temperature	Modbus RTU PT100 / NTC probe rated for low °C (cable length per datasheet)
Door	Dry contact or digital input to Modbus IO module / controller
Example map	Probe on slave 1; door on discrete input or coil — map to door_open boolean

Status: Pending bench test — probe accuracy and response time from probe datasheet; door wiring per IO module manual.

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Connectivity options

Profile	Edge	Link	Status
P1	4G DTU + probe + IO	4G	Pending bench test
P2	ESP32 reads probe + GPIO door	WiFi	Pending bench test
P4	Reefer telematics MQTT	LTE	BYO if keys match

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Wiring — P1 / P2

flowchart TB
  subgraph Cold_room
    PROBE[Temp probe in evaporator zone]
    DOOR[Magnetic door contact]
  end
  subgraph Edge
    IO[Modbus IO or ESP32]
  end
  AC[Autoconnecto]
  PROBE --> IO
  DOOR --> IO
  IO <-->|MQTT| AC

Item	Notes
Probe placement	Per cold-room OEM — avoid direct airflow on coil
Door contact	Fail-safe wiring (normally closed vs open) documented on install sheet
Humidity	Optional; high RH during door open events

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Datasheet alignment

• [ ] Probe range covers setpoint + defrost peaks you expect to alarm on
• [ ] Do not reuse ambient temperature scales from ClimateFleet on cold chain devices
• [ ] Door debounce in edge firmware to avoid alarm chatter

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Autoconnecto checklist

• [ ] Device type cold_chain
• [ ] temperature publishes negative values for freezers
• [ ] door_open boolean JSON type

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Related

• Reference stacks
• Connectivity profiles