---
title: "manually create lambda function"
draft: false
chapter: false
hidden: true
---

## Create Lambda Execution Role

1. Go to IAM Console, choose **Roles** on the left side bar

1. click **Create Role**

1. Under Choose the service that will use this role, choose **Lambda**

1. Click **Next: Permissions**, **Next: Tags**, **Next: Review**

1. In the Review page, enter `alexa-lambda-role` for the **Role name**, and choose **Create role**

1. Click the `alexa-lambda-role`, under **Permissions** tab, click **Add inline policy**

1. In Create Policy page, select **JSON**, and copy & paste the following policy. Please remember to 
replace `<device-table-name>`. Check your DynamoDB table name in DynamoDB 
Console. If you followed [Build Device Binding UI]({{< ref "1.build-device-ui.md" >}}),
a DynamoDB table has already been created. This policy grant the Lambda to read items from device table and put logs 
to CloudWatch.
```json
{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Action": [
                "logs:CreateLogStream",
                "logs:PutLogEvents"
            ],
            "Resource": [
                "*"
            ],
            "Effect": "Allow"
        },
        {
            "Action": [
                "dynamodb:Query"
            ],
            "Resource": [
                "arn:aws:dynamodb:*:*:table/<device-table-name>/index/ByUsernameThingName"
            ],
            "Effect": "Allow"
        },
        {
            "Action": [
                "iot:UpdateThingShadow"
            ],
            "Resource": [
                "*"
            ],
            "Effect": "Allow"
        }
    ]
}
```

1. Click **Review Policy**

1. In the **Name** field, input a name for this policy

1. Click **Create Policy**

## Create the Lambda function

1. Go to [Lambda Console](https://console.aws.amazon.com/lambda/home?region=us-east-1), click **Create function**

1. Select Author from scratch, and enter the following information:
    - Name: Provide a name for your Lambda function
    - Runtime: To use the sample code provided in this topic, choose **Node.js 10.x**
    - Role: select a role [you previously created](#create-lambda-execution-role)
    ![](/images/smart-home/create-lambda-1.png)

1. Click **Create Function**. Your function should be created and you will move to **Configuration**

1. In the **Configuration** designer, under **Add triggers** select the **Alexa Smart Home trigger**

1. In the **Configure triggers** section, add the **Skill ID** from the developer console in the box specified. 

1. Leave **Enable trigger** checked. This enables the Amazon Alexa service to call your Lambda 
function. 

1. Click **Add** and then click **Save**

## Upload Code
1. Firstly, you should git clone [this repo](https://github.com/aws-samples/aws-alexa-workshop-smarthome), 
go to root folder in your Cloud9 environment, and type in terminal
```shell
git clone https://github.com/aws-samples/aws-alexa-workshop-smarthome
cd aws-alexa-workshop-smarthome
```

1. Edit `config.json` file, you can find these information in AWS Console and Alexa 
Console

1. Run `npm install --production` to install dependencies

1. Make a zip file to include `index.js`, `auth.js`, `config.json`, `alexa/` and `node_modules/`,
these files/directories should be located at the root level of the zip file
```
zip -q -r lambda.zip index.js auth.js config.json alexa/ node_modules/
```
![](/images/smart-home/lambda-file-structure.png)

1. Download the zip file to local 

1. Go to AWS Lambda Console, click the lambda function

1. Under **Function code**, click **Upload** to upload the zip file

1. Click the **Save** button at the top right corner