async getIotEndpoint() {
    const res = await this.provider.request('Iot', 'describeEndpoint', {
      endpointType: 'iot:Data-ATS',
    })

    return res.endpointAddress
  }
Fetches the IoT endpoint address from the AWS SDK.
It is a single unique endpoint across all regions in an AWS account.
It is available in the account by default without having to deploy any infra.
Both the shim and the CLI use that endpoint to connect to each other.

@returns {Promise<string>} A promise that resolves with the IoT endpoint address.