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How to set port 443 for AWS MQTT?

I want to deploy devices on sites which have a firewall which block port 8883, which is what the AWS library uses by default for its MQTT connection. According to AWS documentation port 443 should be used instead in this situations, but if I manually set the port to 443 instead then the connection doesn't work. What is the correct way to configure Mongoose OS running on an ESP32 to use the other port, please?

Asking all the sites (potentially hundreds) I want to deploy at to allow port 8883 on a site-by-site basis is impractical.

thanks,

dan.

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