Practical Internet of Things Security - Second Edition

Security monitoring

IoT gateways/brokers should be configured to look for suspicious behavior from the endpoints. As an example, MQTT brokers should capture messages from publishers and subscribers that may signal malicious behavior.

MQTT Specification Version 3.1.1 provides examples of behaviors to report:

• Repeated connection attempts
• Repeated authentication attempts
• Abnormal termination of connections
• Topic scanning
• Sending undeliverable messages
• Clients that connect, but do not send data

Within the AWS IoT suite, one can take advantage of integrated log management features through CloudWatch. CloudWatch can be configured directly within AWS IoT to log process events on messages flowing from devices to the AWS infrastructure.

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