AWS::IoTEvents Construct Library---
The APIs of higher level constructs in this module are experimental and under active development. They are subject to non-backward compatible changes or removal in any future version. These are not subject to the Semantic Versioning model and breaking changes will be announced in the release notes. This means that while you may use them, you may need to update your source code when upgrading to a newer version of this package.
AWS IoT Events enables you to monitor your equipment or device fleets for failures or changes in operation, and to trigger actions when such events occur.
The following example creates an AWS IoT Events detector model to your stack. The detector model need a reference to at least one AWS IoT Events input. AWS IoT Events inputs enable the detector to get MQTT payload values from IoT Core rules.
You can define built-in actions to use a timer or set a variable, or send data to other AWS resources. See also @aws-cdk/aws-iotevents-actions for other actions.
import aws_cdk.aws_iotevents_alpha as iotevents import aws_cdk.aws_iotevents_actions_alpha as actions import aws_cdk.aws_lambda as lambda_ # func: lambda.IFunction input = iotevents.Input(self, "MyInput", input_name="my_input", # optional attribute_json_paths=["payload.deviceId", "payload.temperature"] ) warm_state = iotevents.State( state_name="warm", on_enter=[iotevents.Event( event_name="test-enter-event", condition=iotevents.Expression.current_input(input), actions=[actions.LambdaInvokeAction(func)] )], on_input=[iotevents.Event( # optional event_name="test-input-event", actions=[actions.LambdaInvokeAction(func)])], on_exit=[iotevents.Event( # optional event_name="test-exit-event", actions=[actions.LambdaInvokeAction(func)])] ) cold_state = iotevents.State( state_name="cold" ) # transit to coldState when temperature is less than 15 warm_state.transition_to(cold_state, event_name="to_coldState", # optional property, default by combining the names of the States when=iotevents.Expression.lt( iotevents.Expression.input_attribute(input, "payload.temperature"), iotevents.Expression.from_string("15")), executing=[actions.LambdaInvokeAction(func)] ) # transit to warmState when temperature is greater than or equal to 15 cold_state.transition_to(warm_state, when=iotevents.Expression.gte( iotevents.Expression.input_attribute(input, "payload.temperature"), iotevents.Expression.from_string("15")) ) iotevents.DetectorModel(self, "MyDetectorModel", detector_model_name="test-detector-model", # optional description="test-detector-model-description", # optional property, default is none evaluation_method=iotevents.EventEvaluation.SERIAL, # optional property, default is iotevents.EventEvaluation.BATCH detector_key="payload.deviceId", # optional property, default is none and single detector instance will be created and all inputs will be routed to it initial_state=warm_state )
To grant permissions to put messages in the input,
you can use the
import aws_cdk.aws_iam as iam import aws_cdk.aws_iotevents_alpha as iotevents # grantable: iam.IGrantable input = iotevents.Input.from_input_name(self, "MyInput", "my_input") input.grant_write(grantable)