Lambda function gets stuck after deployment

Hi,

I use GG to deploy a Lambda function to TX2 (JetPack 4.2). The deployment is successful. Then Lambda function just does not run. Here is the log for Lambda function.

[2019-07-30T16:14:38.961-07:00][INFO]-lambda_runtime.py:120,Running [arn:aws:lambda:us-west-2:286168668889:function:leopardlib-image-classification-demo:11]
[2019-07-30T16:14:38.961-07:00][INFO]-ipc_client.py:170,Getting work for function [arn:aws:lambda:us-west-2:286168668889:function:leopardlib-image-classification-demo:11] from http://localhost:8000/2016-11-01/functions/arn:aws:lambda:us-west-2:286168668889:function:leopardlib-image-classification-demo:11/work

And here is the runtime.log.

[2019-07-30T16:14:35.167-07:00][INFO]-MQTT connection successful.	{"attemptId": "soic", "clientId": "adrian-neo-tf-tx2_Core"}
[2019-07-30T16:14:35.168-07:00][INFO]-MQTT connection established.	{"endpoint": "a14iwnd8ozg94-ats.iot.us-west-2.amazonaws.com:8883", "clientId": "adrian-neo-tf-tx2_Core"}
[2019-07-30T16:14:35.168-07:00][INFO]-MQTT connection connected. Start subscribing.	{"clientId": "adrian-neo-tf-tx2_Core"}
[2019-07-30T16:14:35.168-07:00][INFO]-Deployment agent connected to cloud.
[2019-07-30T16:14:35.168-07:00][INFO]-Start subscribing.	{"numOfTopics": 2, "clientId": "adrian-neo-tf-tx2_Core"}
[2019-07-30T16:14:35.168-07:00][INFO]-Trying to subscribe to topic $aws/things/adrian-neo-tf-tx2_Core-gda/shadow/update/delta
[2019-07-30T16:14:35.216-07:00][INFO]-Trying to subscribe to topic $aws/things/adrian-neo-tf-tx2_Core-gda/shadow/get/accepted
[2019-07-30T16:14:35.309-07:00][INFO]-All topics subscribed.	{"clientId": "adrian-neo-tf-tx2_Core"}
[2019-07-30T16:14:35.723-07:00][INFO]-Created worker.	{"functionArn": "arn:aws:lambda:::function:GGIPDetector:1", "workerId": "86738b3d-39fb-4350-7068-a27b6621b6e6", "pid": 21944}
[2019-07-30T16:14:35.857-07:00][WARN]-[5]GK Remote: Error retrieving public key data: ErrPrincipalNotConfigured: private key for MqttCertificate is not set
[2019-07-30T16:14:35.871-07:00][INFO]-Created worker.	{"functionArn": "arn:aws:lambda:::function:GGConnManager", "workerId": "c05d58c5-e8d6-4b4f-74b2-683e5f0046a9", "pid": 21990}
[2019-07-30T16:14:35.999-07:00][INFO]-Created worker.	{"functionArn": "arn:aws:lambda:::function:GGShadowService", "workerId": "b76aa3d9-b267-47bb-76ad-dc2f592100a1", "pid": 22055}
[2019-07-30T16:14:36.176-07:00][INFO]-Created worker.	{"functionArn": "arn:aws:lambda:::function:GGDeviceCertificateManager", "workerId": "06a9fde0-7db1-45cb-5308-d7f6ad43e86c", "pid": 22100}
[2019-07-30T16:14:36.183-07:00][WARN]-[5]GK Remote: Error retrieving public key data: ErrPrincipalNotConfigured: private key for MqttCertificate is not set
[2019-07-30T16:14:36.365-07:00][INFO]-Created worker.	{"functionArn": "arn:aws:lambda:::function:GGCloudSpooler:1", "workerId": "d23354b4-c233-48ed-65e7-fcbbb12c13da", "pid": 22156}
[2019-07-30T16:14:36.523-07:00][INFO]-Created worker.	{"functionArn": "arn:aws:lambda:::function:GGShadowSyncManager", "workerId": "c481a3d9-1b66-4b72-4e9a-3c465da75f19", "pid": 22214}
[2019-07-30T16:14:36.667-07:00][INFO]-Created worker.	{"functionArn": "arn:aws:lambda:::function:GGTES", "workerId": "28eed3d7-f151-4db3-646f-c39b6a77a1d3", "pid": 22272}
[2019-07-30T16:14:36.771-07:00][INFO]-Created worker.	{"functionArn": "arn:aws:lambda:::function:GGSecretManager:1", "workerId": "fdd1803b-91b8-43fd-797f-cb7c35a0d79b", "pid": 22323}
[2019-07-30T16:14:36.772-07:00][INFO]-Started all system components.
[2019-07-30T16:14:36.903-07:00][INFO]-Created worker.	{"functionArn": "arn:aws:lambda:us-west-2:286168668889:function:leopardlib-image-classification-demo:11", "workerId": "1187df1f-9821-46a0-5c52-56ce228d8cf2", "pid": 22374}
[2019-07-30T16:14:37.686-07:00][WARN]-[5]GK Remote: Error retrieving public key data: ErrPrincipalNotConfigured: private key for MqttCertificate is not set

What does the last warning mean?