Nucleus: support for MQTT over Websockets

[aslafy-z]

Feature Description
I would like Nucleus to connect to IoT Core with MQTT over Websocket. I've seen this was possible in the past and automatically enabled when using a proxy, but could not find this feature now. Is it still a thing?

Use Case
IoT core is fronted by a nginx proxy. Every requests are TLS SNI analyzed and routed according to the proxy target.
I would prefer not having to setup a specific port with the stream protocol, instead use the built-in websocket support.

Proposed Solution
Add a mqtt.websocket which defaults to false and configures the transport to talk to the websocket endpoint of IoT Core.

• 👋 I may be able to implement this feature request
• ⚠️ This feature might incur a breaking change

[aws-kevinrickard]

Hi @aslafy-z ,

MQTT over Websockets was removed because it's no longer required for use over a proxy; See #994

If you need to use port 443 for the MQTT connection when using a proxy (so that you don't need to use port 8883), Greengrass supports this when connecting over a proxy: https://docs.aws.amazon.com/greengrass/v2/developerguide/configure-greengrass-core-v2.html#configure-alpn-network-proxy , and can be configured : https://docs.aws.amazon.com/greengrass/v2/developerguide/configure-greengrass-core-v2.html#configure-mqtt-port-443

Do you still have a need for MQTT over a websocket over a proxy?