Creating a trigger that will send messages to a Serverless Containers container from a Yandex IoT Core registry or device topic

If you do not have the Yandex Cloud CLI installed yet, install and initialize it.

By default, the CLI uses the folder specified when creating the profile. To change the default folder, use the yc config set folder-id <folder_ID> command. You can also set a different folder for any specific command using the --folder-name or --folder-id parameter.

To create a trigger that invokes a container, run this command:

yc serverless trigger create internet-of-things \
  --name <trigger_name> \
  --registry-id <registry_ID> \
  --device-id <device_ID> \
  --mqtt-topic '<broker_MQTT_topic>' \
  --batch-size <message_group_size> \
  --batch-cutoff <maximum_timeout> \
  --invoke-container-id <container_ID> \
  --invoke-container-service-account-id <service_account_ID> \
  --retry-attempts <number_of_retry_attempts> \
  --retry-interval <interval_between_retry_attempts> \
  --dlq-queue-id <dead-letter_queue_ID> \
  --dlq-service-account-id <service_account_ID>

Where:

• --name: Trigger name.
• --registry-id: Registry ID.
• --device-id: Device ID. If you are creating a trigger for a registry topic, you can omit this parameter.
• --mqtt-topic: MQTT topic you want to create a trigger for. This is an optional parameter. If this parameter is skipped, the trigger fires for all registry or device topics.

• --batch-size: Size of the message batch from MQTT topics. This is an optional parameter. The values may range from 1 to 10. The default value is 1.
• --batch-cutoff: Maximum waiting time. This is an optional parameter. The values may range from 1 to 60 seconds. The default value is 1 second. The trigger groups messages for a period not exceeding batch-cutoff and sends them to a container. The number of messages cannot exceed batch-size.

• --invoke-container-id: Container ID.
• --invoke-container-service-account-id: ID of the service account with permissions to invoke the container.
• --retry-attempts: Number of invocation retries before the trigger moves a message to the dead-letter queue. This is an optional parameter. The values may range from 1 to 5. The default value is 1.
• --retry-interval: Time to retry invoking the container if the current attempt fails. This is an optional parameter. The values may range from 10 to 60 seconds. The default value is 10 seconds.
• --dlq-queue-id: Dead-letter queue ID. This is an optional parameter.
• --dlq-service-account-id: ID of the service account with write permissions to the dead-letter queue. This is an optional parameter.

Result:

id: a1s5msktijh2********
folder_id: b1gmit33hgh2********
created_at: "2022-10-24T15:19:15.353909857Z"
name: iot-trigger
rule:
  iot_message:
    registry_id: arenou2oj4h2********
    device_id: areqjd6un3h2********
    mqtt_topic: $devices/areqjd6unh2********/events
    batch_settings:
      size: "1"
      cutoff: 0s
    invoke_container:
      container_id: bba5jb38o8h2********
      service_account_id: aje3932acdh2********
      retry_settings:
        retry_attempts: "1"
        interval: 10s
status: ACTIVE

With Terraform, you can quickly create a cloud infrastructure in Yandex Cloud and manage it using configuration files. These files store the infrastructure description written in HashiCorp Configuration Language (HCL). If you change the configuration files, Terraform automatically detects which part of your configuration is already deployed, and what should be added or removed.

Terraform is distributed under the Business Source License. The Yandex Cloud provider for Terraform is distributed under the MPL-2.0 license.

For more information about the provider resources, see the relevant documentation on the Terraform website or its mirror.

If you do not have Terraform yet, install it and configure the Yandex Cloud provider.

To create a trigger for Yandex IoT Core:

1. In the configuration file, describe the trigger parameters:

   resource "yandex_function_trigger" "my_trigger" {
     name = "<trigger_name>"
     container {
       id                 = "<container_ID>"
       service_account_id = "<service_account_ID>"
       retry_attempts     = "<number_of_retry_attempts>"
       retry_interval     = "<interval_between_retry_attempts>"
     }
     iot {
       registry_id  = "<registry_ID>"
       device_id    = "<device_ID>"
       topic        = "<broker_MQTT_topic>"
       batch_cutoff = "<maximum_timeout>"
       batch_size   = "<message_group_size>"
     }
     dlq {
      queue_id           = "<dead-letter_queue_ID>"
      service_account_id = "<service_account_ID>"
    }
   }
   

   Where:

   • name: Trigger name. The name format is as follows:

     • It must be from 2 to 63 characters long.
     • It can only contain lowercase Latin letters, numbers, and hyphens.
     • It must start with a letter and cannot end with a hyphen.

   • container: Container parameters:

     • id: Container ID.
     • service_account_id: ID of the service account with rights to invoke the container.
     • retry_attempts: Number of invocation retries before the trigger moves a message to the dead letter queue. This is an optional parameter. The values may range from 1 to 5. The default value is 1.
     • retry_intervall: Time to retry invoking the container if the current attempt fails. This is an optional parameter. The values may range from 10 to 60 seconds. The default value is 10 seconds.

   • iot: Trigger parameters:

     • registry-id: Registry ID.
     • device-id: Device ID. If you are creating a trigger for a registry topic, you can omit this parameter.
     • topic: MQTT topic you want to create a trigger for. This is an optional parameter. If this parameter is skipped, the trigger fires for all registry or device topics.
     • batch_cutoff: Maximum wait time. This is an optional parameter. The values may range from 1 to 60 seconds. The default value is 1 second. The trigger groups messages for a period not exceeding batch_cutoff and sends them to a container. The number of messages cannot exceed batch_size.
     • batch_size: Size of the message batch from MQTT topics. This is an optional parameter. The values may range from 1 to 10. The default value is 1.
   • dlq: Dead-letter queue message parameters:
     • queue_id: Dead-letter queue ID. This is an optional parameter.
     • service_account_id: ID of the service account with write permissions to the dead-letter queue. This is an optional parameter.

   For more information about resource parameters in Terraform, see the provider documentation.

2. Create resources:

   1. In the terminal, go to the directory where you edited the configuration file.

   2. Make sure the configuration file is correct using this command:

      terraform validate
      

      If the configuration is correct, you will get this message:

      Success! The configuration is valid.
      

   3. Run this command:

      terraform plan
      

      You will see a detailed list of resources. No changes will be made at this step. If the configuration contains any errors, Terraform will show them.

   4. Apply the changes:

      terraform apply
      

   5. Type yes and press Enter to confirm the changes.

   Terraform will create all the required resources. You can check the new resources using the management console or this CLI command:

   yc serverless trigger list
   

To create a trigger for Yandex IoT Core, use the create REST API method for the Trigger resource or the TriggerService/Create gRPC API call.