MQTT communication for GG V2 between Native and Lambda component

Good evening everyone 👋,

I have a question that has been bugging me for a couple of hours at this point.

I'm trying to set up a local MQTT communication between a Lambda and a Native component. However, I keep running into authorization issues when I try to publish a message from the Lambda function.

I realized that in for Native components, such authorizations can be granted through accessControl parameters in the configuration of the component, such as:

"ComponentConfiguration": {
        "DefaultConfiguration": {
            "accessControl": {
                "aws.greengrass.ipc.mqttproxy": {
                    "com.iotcommunication:mqttproxy:1": {
                        "policyDescription": "Allow IoT Core MQTT communication to component",
                        "operations": [
                            "aws.greengrass#SubscribeToIoTCore"
                        ],
                        "resources": [
                            "thesis/start"
                        ]
                    }
                },
                "aws.greengrass.ipc.pubsub": {
                    "com.localcommunication:pubsub:1": {
                        "policyDescription": "Allows Local MQTT communication to component",
                        "operations": [
                            "aws.greengrass#PublishToTopic",
                            "aws.greengrass#SubscribeToTopic"
                        ],
                        "resources": [
                            "*"
                        ]
                    }
                }
            }
        }
    },

However, this is not the case in a Lambda function component, where only Event Sources can be configured. These sources are just there for subscribing to topics, but not for publishing.

"componentLambdaParameters": {
  "eventSources": [
        {
           "topic": "local/nocontainer/nopinned",
           "type": "PUB_SUB"
        }
   ],
}

Therefore, when a message is published by the Lambda function to the topic, the following error is given in the execution:

2023-11-02T15:51:44.247Z [ERROR] (pool-2-thread-62) lambda_nocontainer_nopinned: lambda_function.py:118,Unauthorized error while publishing to topic: thesis/gateway. {serviceInstance=1, serviceName=lambda_nocontainer_nopinned, currentState=RUNNING}

I'm assuming that this error is given due to insufficient access control. So my question is, how do I make this setup work where my Lambda function can just publish messages to a Local MQTT topic.

I appreciate it a lot 🙏