Cumulocity

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Overview

A client-mode connector for a curated cloud-IoT slice of Cumulocity IoT covering current-user connectivity and the POST events:

Catalog connector event	Entity / path	Notes
POST measurement/measurements	`POST /measurement/measurements`	Telemetry / sensor readings
POST alarm/alarms	`POST /alarm/alarms`	Alarms (severity + status)
POST inventory/managedObjects	`POST /inventory/managedObjects`	Devices / assets
POST event/events	`POST /event/events`	Discrete device/app events
(auth helper)	`GET /user/currentUser`	Checks that you are signed in

Default BASE_ADDRESS is https://trial.cumulocity.com (no trailing slash; substitute {tenant}). Topics use cloud-iot/cumulocity/<object>/<verb>. See the base guide: REST API Connectors.

Auth header: Pass the full Authorization value via MQTT JSON field authorization — either Basic <Base64(tenantID/username:password)> or Bearer {access_token} (OAuth 2.0 / OAI-Secure / Cumulocity IdP). On the tenant host URL, the username may omit the tenantID/ prefix. Prefer Hub secrets (CUMULOCITY_AUTH). Never commit real credentials.

Basic Syntax

# Coreflux REST_API template — Cumulocity IoT curated slice
# Auth: Authorization via {value.json.authorization} (Basic … or Bearer …)
# BASE_ADDRESS: https://trial.cumulocity.com  → substitute https://{tenant}.cumulocity.com

DEFINE CONNECTOR CumulocityRestApi WITH TYPE REST_API
    ADD REST_API_CONFIG
        WITH BASE_ADDRESS "https://trial.cumulocity.com"
        WITH ENABLE_CLIENT "true"
        WITH USE_SSL "true"
        WITH REQUEST_TIMEOUT '60'
        WITH DEFAULT_CONTENT_TYPE "application/json"
    ADD EVENT GetCurrentUser
        WITH SOURCE_TOPIC "cloud-iot/cumulocity/user/current"
        WITH DESTINATION_TOPIC "cloud-iot/cumulocity/user/current/response"
        WITH METHOD "GET"
        WITH ENDPOINT "/user/currentUser"
        WITH HEADERS
            ADD "Accept" "application/json"
            ADD "Authorization" "{value.json.authorization}"
    ADD EVENT CreateMeasurement
        WITH SOURCE_TOPIC "cloud-iot/cumulocity/measurement/create"
        WITH DESTINATION_TOPIC "cloud-iot/cumulocity/measurement/create/response"
        WITH METHOD "POST"
        WITH ENDPOINT "/measurement/measurements"
        WITH HEADERS
            ADD "Accept" "application/json"
            ADD "Content-Type" "application/json"
            ADD "Authorization" "{value.json.authorization}"
        WITH BODY "{payload}"
    ADD EVENT CreateAlarm
        WITH SOURCE_TOPIC "cloud-iot/cumulocity/alarm/create"
        WITH DESTINATION_TOPIC "cloud-iot/cumulocity/alarm/create/response"
        WITH METHOD "POST"
        WITH ENDPOINT "/alarm/alarms"
        WITH HEADERS
            ADD "Accept" "application/json"
            ADD "Content-Type" "application/json"
            ADD "Authorization" "{value.json.authorization}"
        WITH BODY "{payload}"
    ADD EVENT CreateManagedObject
        WITH SOURCE_TOPIC "cloud-iot/cumulocity/inventory/create"
        WITH DESTINATION_TOPIC "cloud-iot/cumulocity/inventory/create/response"
        WITH METHOD "POST"
        WITH ENDPOINT "/inventory/managedObjects"
        WITH HEADERS
            ADD "Accept" "application/json"
            ADD "Content-Type" "application/json"
            ADD "Authorization" "{value.json.authorization}"
        WITH BODY "{payload}"
    ADD EVENT CreateEvent
        WITH SOURCE_TOPIC "cloud-iot/cumulocity/event/create"
        WITH DESTINATION_TOPIC "cloud-iot/cumulocity/event/create/response"
        WITH METHOD "POST"
        WITH ENDPOINT "/event/events"
        WITH HEADERS
            ADD "Accept" "application/json"
            ADD "Content-Type" "application/json"
            ADD "Authorization" "{value.json.authorization}"
        WITH BODY "{payload}"

Example MQTT payloads

GetCurrentUser:

{
  "authorization": "Basic dGVuYW50L3VzZXI6cGFzc3dvcmQ="
}

CreateMeasurement:

{
  "authorization": "Basic dGVuYW50L3VzZXI6cGFzc3dvcmQ=",
  "payload": "{\"source\":{\"id\":\"12345\"},\"time\":\"2026-10-04T08:00:00.000Z\",\"type\":\"c8y_TemperatureMeasurement\",\"c8y_TemperatureMeasurement\":{\"T\":{\"value\":21.5,\"unit\":\"C\"}}}"
}

CreateAlarm:

{
  "authorization": "Bearer eyJhbGciOiJSUzI1NiJ9...",
  "payload": "{\"source\":{\"id\":\"12345\"},\"time\":\"2026-10-04T08:00:00.000Z\",\"type\":\"c8y_ThresholdAlarm\",\"text\":\"Temp high\",\"severity\":\"MAJOR\",\"status\":\"ACTIVE\"}"
}

CreateManagedObject:

{
  "authorization": "Basic dGVuYW50L3VzZXI6cGFzc3dvcmQ=",
  "payload": "{\"name\":\"Coreflux demo device\",\"type\":\"c8y_Device\",\"c8y_IsDevice\":{}}"
}

CreateEvent:

{
  "authorization": "Basic dGVuYW50L3VzZXI6cGFzc3dvcmQ=",
  "payload": "{\"source\":{\"id\":\"12345\"},\"time\":\"2026-10-04T08:00:00.000Z\",\"type\":\"c8y_LocationUpdate\",\"text\":\"Position update\"}"
}

References

Last modified on October 25, 2026

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Overview

Basic Syntax

Example MQTT payloads

References