BasicDiscovery.py unable to publish messages

Question

Seeing below error in GGConnManager.log -

For the device -publisher, I  used AmazonRootCA1.pem for rootCA. not sure why the connection error says unknow CA

[ERROR]-MQTT message decoding error: unable to decode received MQTT message.     {"errorString": "remote error: tls: unknown certificate authority"}

Any help is appreciated

Answer

Hi. It seems you are using GGv1. Please be aware that GGv1 is now in maintenance mode and GGv2 is recommended for any new development. Please consider to follow this tutorial instead: https://docs.aws.amazon.com/greengrass/v2/developerguide/client-devices-tutorial.html

That said, the **BasicDiscovery.py** script in the Python V1 SDK should perform Greengrass discovery and retrieve the GGv1 group CA (https://github.com/aws/aws-iot-device-sdk-python/blob/master/samples/greengrass/basicDiscovery.py#L106). It should then use the group CA to connect to the GGv1 core (https://github.com/aws/aws-iot-device-sdk-python/blob/master/samples/greengrass/basicDiscovery.py#L150). But it looks like it's finding and using the wrong group CA.

BasicDiscovery.py unable to publish messages

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