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I have a BeagleBone Green board running Debian. It uses Connman as the network manager.

The configuration file should be /etc/connman/main.conf however this doesn't exist.

I have two active network interfaces connecting to the internet, a wi-fi interface wlan0, and ethernet interface eth0.

Which interface takes preference / priority in this case when communicating to the outside world? Where is this configured if there is no /etc/connman/main.conf.

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Which interface takes preference / priority in this case when communicating to the outside world?

Priority should be set in the main.conf, you can create it manually.

Answer from Arch-linux wiki:

Prefer ethernet to wireless

By default ConnMan does not prefer ethernet over wireless, which can lead to it deciding to stick with a slow wireless network even when ethernet is available. You can tell connman to prefer ethernet adding the following to /etc/connman/main.conf:

[General]
PreferredTechnologies=ethernet,wifi

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