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To create a rule that sends an Amazon SNS alert

The following create-topic-rule example creates a rule that sends an Amazon SNS message when soil moisture level readings, as found in a device shadow, are low.

aws iot create-topic-rule \
    --rule-name "LowMoistureRule" \
    --topic-rule-payload file://plant-rule.json

The example requires the following JSON code to be saved to a file named plant-rule.json:

{
    "sql": "SELECT * FROM '$aws/things/MyRPi/shadow/update/accepted' WHERE state.reported.moisture = 'low'\n",
    "description": "Sends an alert whenever soil moisture level readings are too low.",
    "ruleDisabled": false,
    "awsIotSqlVersion": "2016-03-23",
    "actions": [{
            "sns": {
                "targetArn": "arn:aws:sns:us-west-2:123456789012:MyRPiLowMoistureTopic",
                "roleArn": "arn:aws:iam::123456789012:role/service-role/MyRPiLowMoistureTopicRole",
                "messageFormat": "RAW"
            }
    }]
}

This command produces no output.

For more information, see Creating an AWS IoT Rule in the AWS IoT Developers Guide.