How to integrate with Lambda? Layer setup?

[StefanR23]

I want to use the the IoT SDK within a lambda
but I'm getting the following error message

AWS CRT binary not present in any of the following locations:\n\t/var/bin/linux-arm64-glibc/aws-crt-nodejs.node
Setup:
"aws-crt": "^1.26.2",
"aws-iot-device-sdk-v2": "^1.21.3",

Some issues mentioned to use a layer. Some points I found out so far:

• lamdba starts in '/var/task'
• lambda layers will deflated to "/opt" https://docs.aws.amazon.com/lambda/latest/dg/packaging-layers.html#packaging-layers-paths
• You can extent the paths bindings.js is looking into
  AWS_CRT_NODEJS_BINARY_RELATIVE_PATH
  AWS_CRT_NODEJS_BINARY_ABSOLUTE_PATH

Approach: So what approach looks promising for me but still fails

{
  "name": "aws-crt-layer",
  "version": "1.0.0",
  "scripts": {
    "build": "npm run mkdir && npm run cp && npm run pack",
    "pack": "zip -r aws_crt_layer_nodejs.zip bin",
    "cp": "cp -rv node_modules/aws-crt/dist/bin/linux-arm64-glibc opt",
    "mkdir": "mkdir -p opt/var/bin"

  },
  "dependencies": {
    "aws-crt": "^1.26.2"
  }
}

And set the the env variable
AWS_CRT_NODEJS_BINARY_ABSOLUTE_PATH = "/opt/bin/linux-arm64-glibc/aws-crt-nodejs.node"

Testing the layer:

console.log(fs.readdirSync('/opt/bin/linux-arm64-glibc'));
INFO  [ 'aws-crt-nodejs.node' ]

Now I got the message that the module cannot be found. What I have done wrong or what I missed?

{
  "errorType": "Runtime.ImportModuleError",
  "errorMessage": "Error: Cannot find module '/opt/bin/linux-arm64-glibc/aws-crt-nodejs.node'",
  "trace": [
    "Runtime.ImportModuleError: Error: Cannot find module '/opt/bin/linux-arm64-glibc/aws-crt-nodejs.node'",
    "    at _loadUserApp (file:///var/runtime/index.mjs:1087:17)",
    "    at async UserFunction.js.module.exports.load (file:///var/runtime/index.mjs:1119:21)",
    "    at async start (file:///var/runtime/index.mjs:1282:23)",
    "    at async file:///var/runtime/index.mjs:1288:1"
  ]
}