![]() ![]() To create data for a child instead of the root device, the unique ID of the child is added as another section in the topic (for example s/us/m圜hildDeviceIdentifier). We recommend you to use a combination of the unique ID of the root device and a unique ID within the hierarchy. MQTT sessions are linked to a single device, but this device can have a freely configurable device hierarchy below it.Īll children require a unique ID defined when creating the device. \n does not create a new line in the output (for example console, UI) to achieve this, a new line character (ASCII 0A) needs to be used. The same escaping rules apply to messages that will be sent from the server to the client. Contained double-quotes ( ") must be escaped by prepending a backslash ( \). If a value contains double-quotes ( "), commas ( ,), leading or trailing whitespaces, line-breaks ( \n), carriage returns ( \r) or tab stops, it must be surrounded by quotes ( ").Values are always separated by a comma ( ,).Every row must be terminated by the \n character sequence. ![]() The following rules must be followed to ensure a frictionless communication. The CSV (comma-separated values) format is used for communication with the SmartREST endpoint. ![]() You can send multiple messages in a single publish by using a line break between messages. The first parameter is an ID that defines the message. SmartREST basicsĪ SmartREST message is a single row in which each parameter is separated by comma. The header size varies, but its minimum is 2 bytes. Some references can be found on the MQTT website.įor all MQTT connections to the platform, the maximum accepted payload size is 16184 bytes, which includes both message header and body. If you are unfamiliar with MQTT, we recommend you to consult one of the numerous introductions in the Internet. This section does not describe the basics of MQTT communication. Device certificates describes how devices can connect via MQTT with certificates.Device integration walks you through the process of interfacing devices with Cumulocity IoT through MQTT.MQTT implementation gives a detailed reference of protocol-level aspects in the Cumulocity IoT implementation of MQTT.The MQTT section is structured as follows: Processing modes: Control whether data is persisted in Cumulocity IoT database, transiently passed to real-time processing, processed using quiescent mode which ensures that real-time notifications are disabled or is processed using CEP mode that ensures data is transiently sent to real-time processing engine only with real-time notifications disabled.Custom payload formats: Additional payload formats can be added.Standard IoT payload formats: Pre-defined payload formats to support IoT sensor readings, alarm management, remote control and device hierarchies.Device management: Rich, pre-defined device management payload formats to enable out-of-the-box management of millions of devices.Device registration: Non-personalized devices can be deployed by pairing them with Cumulocity IoT tenants.Device identity management: Devices authenticate using device-specific credentials.Multi-tenancy support: A single endpoint serves multiple tenants.The MQTT implementation of Cumulocity IoT provides the following benefits: ![]()
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