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External Nodes used are used to interact with external systems.

• AWS SNS Node
• AWS SQS Node
• Kafka Node
• MQTT Node
• Azure IoT Hub Node
• RabbitMQ Node
• REST API Call Node
• Send Email Node
• Send SMS Node
• Twilio SMS Node

AWS SNS Node

Node publish messages to AWS SNS (Amazon Simple Notification Service).

Configuration:

• Topic ARN pattern - can be set direct topic name for message publishing or pattern can be used, that will be resolved to the real ARN Topic name using Message metadata.
• AWS Access Key ID and AWS Secret Access Key are the credentials of an AWS IAM User with programmatic access. More information on AWS access keys can be found here.
• AWS Region must correspond to the one in which the SNS Topic(s) are created. Current list of AWS Regions can be found here.

In the following example, topic name depends on Device Type and there is a Message that contains deviceType field in Metadata:

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{
    deviceType: controller
}

For publishing message in controller’s topic, we will set this pattern in Topic ARN pattern:

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arn:aws:sns:us-east-1:123456789012:${deviceType}

In runtime, pattern will be resolved to arn:aws:sns:us-east-1:123456789012:controller

Published payload - Node will publish full Message payload to the SNS. If required, Rule Chain can be configured to use chain of Transformation Nodes for sending correct Payload to the SNS.

Outbound message from this node will contain response messageId and requestId in Message metadata. Original Message payload, type and originator will not be changed.

AWS SQS Node

Node publish messages to the AWS SQS (Amazon Simple Queue Service).

Configuration:

• Queue Type - SQS queue type. Can be Standard or FIFO.
• Queue URL Pattern - Pattern for building Queue URL. For example ${deviceType}. Can be set direct Queue URL for message publishing or pattern can be used, that will be resolved to the real Queue URL using Message metadata.
• Delay - delay in seconds, used to delay a specific message.
• Message attributes - optional list of message attributes to publish.
• AWS Access Key ID and AWS Secret Access Key are the credentials of an AWS IAM User with programmatic access. More information on AWS access keys can be found here.
• AWS Region must correspond to the one in which the SQS Queue(s) are created. Current list of AWS Regions can be found here.

In the following example, Queue URL depends on Device Type and there is a Message that contains deviceType field in Metadata:

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{
    deviceType: controller
}

For publishing message in controller’s Queue, we will set this pattern in Queue URL pattern:

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https://sqs.us-east-1.amazonaws.com/123456789012/${deviceType}

In runtime, pattern will be resolved to https://sqs.us-east-1.amazonaws.com/123456789012/controller

Published body - Node will publish full Message payload to the SQS. If required, Rule Chain can be configured to use chain of Transformation Nodes for sending correct Payload to the SQS.

Published attributes - optional list of attributes can be added for publishing message in SQS. It is a collection of - pairs. Both, NAME and VALUE, could be a static values or patterns that will be resolved using Message metadata.

If FIFO queue is selected, then Message ID will be used as deduplication ID and Message originator as group ID.

Outbound message from this node will contain response messageId, requestId, messageBodyMd5, messageAttributesMd5 and sequenceNumber in Message metadata. Original Message payload, type and originator will not be changed.

Kafka Node

Kafka Node sends messages to Kafka brokers. Expects messages with any message type. Will send record via Kafka producer to Kafka server.

Configuration:

• Topic pattern - can be a static string, or pattern that is resolved using Message Metadata properties. For example ${deviceType}
• bootstrap servers - list of kafka brokers separated with comma.
• Automatically retry times - number of attempts to resend message if connection fails.
• Produces batch size - batch size in bytes for grouping messages with the same partition.
• Time to buffer locally - max local buffering window duration in ms.
• Client buffer max size - max buffer size in bytes for sending messages.
• Number of acknowledgments - number of acknowledgments node requires to received before considering a request complete.
• Key serializer - by default org.apache.kafka.common.serialization.StringSerializer
• Value serializer - by default org.apache.kafka.common.serialization.StringSerializer
• Other properties - any other additional properties could be provided for kafka broker connection.

Published body - Node will send full Message payload to the Kafka topic. If required, Rule Chain can be configured to use chain of Transformation Nodes for sending correct Payload to the Kafka.

Outbound message from this node will contain response offset, partition and topic properties in the Message metadata. Original Message payload, type and originator will not be changed.

Note - if you want to use Confluent cloud as a kafka broker you should add next properties:

• CLUSTER_API_KEY - your access key from Cluster settings.
• CLUSTER_API_SECRET - your access secret from Cluster settings.

MQTT Node

Publish incoming message payload to the topic of the configured MQTT broker with QoS AT_LEAST_ONCE.

Configuration:

• Topic pattern - can be a static string, or pattern that is resolved using Message Metadata properties. For example ${deviceType}.
• Host - MQTT broker host.
• Port - MQTT broker port.
• Connection timeout - timeout in seconds for connecting to MQTT broker.
• Client ID - optional client identifier used for connecting to MQTT broker. If not specified, default generated clientId will be used.
• SSL Enable/Disable - enable/disable secure communication.
• Credentials - MQTT connection credentials. Can be either Anonymous, Basic or PEM.

Different Authentication credentials are supported for external MQTT broker:

• Anonymous - no authentication
• Basic - username\password pair is used for authenticating
• PEM - PEM certificates are used for Authentication

If PEM credentials type is selected, the following configuration should be provided:

• CA certificate file
• Certificate file
• Private key file
• Private key password

Published body - Node will send full Message payload to the MQTT topic. If required, Rule Chain can be configured to use chain of Transformation Nodes for sending correct Payload to the MQTT broker.

In case of successful message publishing, original Message will be passed to the next nodes via Success chain, otherwise Failure chain is used.

Azure IoT Hub Node

Configuration:

• Topic - for more information about IoT Hub topic use link.
• Hostname - Azure IoT Hub Hostname.
• Device ID - Your Device ID from Azure IoT Hub.
• Credentials - Azure IoT Hub connection credentials. Can be either Shared Access Signature or PEM.

Different Authentication credentials are supported for Azure IoT Hub:

• Shared Access Signature - SAS Key is used for Authentication
• PEM - PEM certificates are used for Authentication

If Shared Access Signature credentials type is selected, the following configuration should be provided:

• SAS Key - it is key from your device in Azure IoT Hub
• CA certificate file, by default used Baltimore certificate. More about certificates here

If PEM credentials type is selected, the following configuration should be provided:

• CA certificate file, by default used Baltimore certificate. More about certificates here
• Certificate file
• Private key file
• Private key password

X.509 CA-signed authentication

CACertificates instruction

Published body - Node will send full Message payload to the Azure IoT Hub device. If required, Rule Chain can be configured to use chain of Transformation Nodes for sending correct Payload to the Azure IoT Hub.

In case of successful message publishing, original Message will be passed to the next nodes via Success chain, otherwise Failure chain is used.

RabbitMQ Node

Publish incoming message payload to the RabbitMQ.

Configuration:

• Exchange name pattern - the exchange to publish the message to. Can be a static string, or pattern that is resolved using Message Metadata properties. For example ${deviceType} .
• Routing key pattern - the routing key. Can be a static string, or pattern that is resolved using Message Metadata properties. For example ${deviceType} .
• Message properties - optional routing headers. Supported headers BASIC, TEXT_PLAIN, MINIMAL_BASIC, MINIMAL_PERSISTENT_BASIC, PERSISTENT_BASIC, PERSISTENT_TEXT_PLAIN
• Host - default host to use for connections
• Port - default port to use for connections
• Virtual host - the virtual host to use when connecting to the broker
• Username - AMQP user name to use when connecting to the broker
• Password - AMQP password to use when connecting to the broker
• Automatic recovery - enables or disables automatic connection recovery
• Connection timeout - connection TCP establishment timeout in milliseconds; zero for infinite
• Handshake timeout - the AMQP0-9-1 protocol handshake timeout, in milliseconds
• Client properties - additional properties that are sent to the server during connection startup

Published body - Node will send full Message payload to the RabbitMQ. If required, Rule Chain can be configured to use chain of Transformation Nodes for sending correct Payload.

In case of successful message publishing, original Message will be passed to the next nodes via Success chain, otherwise Failure chain is used.

REST API Call Node

Invoke REST API calls to the external REST server.

Configuration:

• Endpoint URL pattern - Can be a static string, or pattern that is resolved using Message Metadata properties. For example ${deviceType}
• Request method - GET, POST, PUT, DELETE
• Headers - request headers, header or value can be a static string, or pattern that is resolved using Message Metadata properties.

Endpoint URL

URL can be a static string or a pattern. Only Message metadata is used for resolving patterns. So property names that are used in the patterns must exist in the Message Metadata, otherwise raw pattern will be added into URL.

For example, if Message payload contains property deviceType with value container, then this pattern:

http://localhost/api/${deviceType}/update

will be resolved to

http://localhost/api/container/update

Headers

Collection of header name/value can be configured. Those headers will be added into Rest request. Pattern should be used for configured both header name and header value. For example ${deviceType}. Only Message metadata is used for resolving patterns. So property names that are used in the pattern must exist in the Message Metadata, otherwise raw pattern will be added into header.

Request body - Node will send full Message payload to the configured REST endpoint. If required, Rule Chain can be configured to use chain of Transformation Nodes for sending correct Payload.

Outbound message from this node will contain response status, statusCode, statusReason and responce headers in the Message metadata. Outbound Message payload will be the same as response body. Original Message type and originator will not be changed.

To send a single file as request body, add a field attachments to the message metadata with file uuid stored in DataBase. In that case any message data will be ignored and only file content will be sent. To define a request content type use the header setting like

Content-Type: application/json; charset=UTF-8

Here an example of message metadata to send a single file:

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{
  "attachments": "e18b6950-dfca-11eb-affb-8db134b46d68"
}

NOTE: This is part of File Storage feature supported by IoT Hub.

In case of successful request, outbound message will be passed to the next nodes via Success chain, otherwise Failure chain is used.

Send Email Node

Node sends incoming message using configured Mail Server. This Node works only with messages that where created using To Email transformation Node, please connect this Node with To Email Node using Success chain.

Configuration:

• Use system SMTP settings - if enabled default Mail Server configured on System level will be used
• Protocol - Mail Server transport protocol: SMTP or SMTPS
• SMTP host - Mail Server host
• SMTP port - Mail Server port
• Timeout ms - read timeout in milliseconds
• Enable TLS - if true, enables the use of the STARTTLS command (if supported by the server)
• Username - username for the account at the mail host, if any
• Password - password for the account at the mail host, if any

This Node can work with default Mail Server configured on System level. Please find more details about how to configure default System SMTP Settings.

If specific Mail Server is required for this node - disable Use system SMTP settings checkbox and configure Mail Server manually.

Additionally this node can create email attachments if incoming message has prepared attachments metadata field with reference to files stored in DataBase.

Multiple attachments supported. Use a comma separated no whitespace references (uuids) to send many files. Here an example of message metadata:

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{
  "attachments": "e18b6950-dfca-11eb-affb-8db134b46d68,17383b4c-6000-4bb8-be04-b1cb15aa18c5"
}

NOTE: This is part of File Storage feature supported by IoT Hub.

In case of successful mail sending, original Message will be passed to the next nodes via Success chain, otherwise Failure chain is used.

You can see the real life example, where this node is used, in the next tutorial:

• Send Email

Send SMS Node

Node is able to construct SMS message based on the metadata fields from the incoming message and send it using AWS SNS or Twilio SMS providers. We recommend enabling debug mode for the rule node.

Configuration:

• Use system SMS provider settings - if enabled default SMS Provider Server configured on System level will be used. See SMS Provider settings for more details;
• Phone Numbers To template - Allows to configure multiple phone numbers where the SMS will be sent to. Optionally, you may reference fields from the message metadata.
• SMS message template - Allows to configure body of the SMS message. Optionally, you may reference fields from the message metadata.

This Node can work with default SMS provider configured on System level. If SMS message will be sent to all recipients successfully, original Message will be passed to the next nodes via Success chain, otherwise Failure chain is used.

Twilio SMS Node

Professional Rule Node

Sends incoming message payload as SMS message via Twilio service.

Configuration:

• Phone Number From - can be set direct phone number as Number From of SMS or pattern can be used, that will be resolved to the real Number From using Message metadata.
• Phone Numbers To - comma separated recipient Phone Numbers list. Can be set direct phone numbers or pattern can be used, that will be resolved to the real phone numbers using Message metadata.
• Twilio Account SID - your Account Sid at twilio.com/console
• Twilio Account Token - your Account Token at twilio.com/console

SMS message will be sent to all recipients taken from Phone Numbers To list.

If SMS message will be sent to all recipients successfully, original Message will be passed to the next nodes via Success chain, otherwise Failure chain is used.