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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 <https://docs.aws.amazon.com/iot/latest/developerguide/iot-create-rule.html>`__ in the *AWS IoT Developers Guide*.
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