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This PR configures NetworkManager to always try to acquire link-local IPv4 addresses (`169.254.x.y/16`) on its direct connections to other devices, so that they can be used in the following cases: - ~If an RPi is trying to get an IP address via DHCP but the request times out, then the RPi might be able to get internet access via the link-local address as a fallback~ (I tested this and it didn't work, so I've removed it from this PR) - If multiple RPis are connected to the same computer, their statically-assigned IP addresses will conflict but they'll still be accessible via their link-local addresses (though mDNS probably won't use those link-local addresses instead, so an IP address scanner would be needed to discover the devices on their link-local addresses) In other words, here the link-local addresses are a last-resort escape hatch for still being able to access the RPi even if things have gone very wrong. This PR also stops trying to acquire static IP addresses on connections which use DHCP for dynamic IP address assignment, because then DHCP fails if the network on the other end already uses that static IP address. This was a bug I discovered in testing, and things seem to work fine after removal. This PR also bumps the device-admin ctr img to integrate openUC2/device-admin#27, openUC2/device-admin#28, and openUC2/device-admin#29
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Because some institutional networks may require users to register their devices (and, in the process, to provide a MAC address for each such device) for network/internet access, users of the simplified Internet Access page may also need to find the MAC address for
wlan1. It's better if we provide it to them on the simplified page rather than instructing them to use our advanced page (which comes without documentation). This PR changes the simplified page to show the MAC addresses for the network devices.