'Publish to topic from AWS Lambda stop working

I have a Lambda function that has been working without issue for several months. Starting a couple of days ago, now a publish to an MQTT client always times out. Here's the publish code:

    client = boto3.client('iot-data', region_name='us-east-1')
    client.publish(topic= 'sdk/test/Python',qos=1,payload=mypayload)

From the log file:

2020-12-18T13:57:35.652Z 6660d942-766d-419e-88d2-c09c11dd33cc Task timed out after 3.00 seconds

The client is running on a raspberrypi. I can publish to the topic from the Iot test console and the client running on the rpi that subscribed to the topic receives the test messages.

If I subscribe to the topic using the Iot test console, messages are NOT received

There's an inline policy for the lambda function for the publish:

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "iot:Publish"
            ],
            "Resource": [
                "*"
            ]
        }
    ]
}

How do I fix or debug this? The 3 second timeout should be plenty long enough, so I haven't tried making it long.

Solution 1:^[1]

I too had this issue and was able to resolve it by changing the Lambda runtime to use the latest Python version (3.8).

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Source: Stack Overflow

Solution	Source
Solution 1	Dave Crumbacher

'Publish to topic from AWS Lambda stop working

Solution 1:[1]

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Related Questions

Solution 1:^[1]