Example: Device HeartBeat to monitor device connections

This detector model is one of the templates available from the Amazon IoT Events console. It's included here for your convenience.

{
    "detectorModelDefinition": {
        "states": [
            {
                "onInput": {
                    "transitionEvents": [
                        {
                            "eventName": "To_normal",
                            "actions": [],
                            "condition": "currentInput(\"AWS_IoTEvents_Blueprints_Heartbeat_Input\")",
                            "nextState": "Normal"
                        }
                    ],
                    "events": []
                },
                "stateName": "Offline",
                "onEnter": {
                    "events": [
                        {
                            "eventName": "Send_notification",
                            "actions": [
                                {
                                    "sns": {
                                        "targetArn": "sns-topic-arn"
                                    }
                                }
                            ],
                            "condition": "true"
                        }
                    ]
                },
                "onExit": {
                    "events": []
                }
            },
            {
                "onInput": {
                    "transitionEvents": [
                        {
                            "eventName": "Go_offline",
                            "actions": [],
                            "condition": "timeout(\"awake\")",
                            "nextState": "Offline"
                        }
                    ],
                    "events": [
                        {
                            "eventName": "Reset_timer",
                            "actions": [
                                {
                                    "resetTimer": {
                                        "timerName": "awake"
                                    }
                                }
                            ],
                            "condition": "currentInput(\"AWS_IoTEvents_Blueprints_Heartbeat_Input\")"
                        }
                    ]
                },
                "stateName": "Normal",
                "onEnter": {
                    "events": [
                        {
                            "eventName": "Create_timer",
                            "actions": [
                                {
                                    "setTimer": {
                                        "seconds": 300,
                                        "timerName": "awake"
                                    }
                                }
                            ],
                            "condition": "$input.AWS_IoTEvents_Blueprints_Heartbeat_Input.value > 0"
                        }
                    ]
                },
                "onExit": {
                    "events": []
                }
            }
        ],
        "initialStateName": "Normal"
    }
}