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todo: add notes about pushing network selection to wpa_supplicant
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TODO
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TODO
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@ -512,6 +512,30 @@ device up and do a full scan just in case the user is near a known SSID that was
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not in the N top recently used networks. This is also beneficial to normal
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desktop use-cases.
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wpa_supplicant doesn't currently provide an explicit interface for sending SSIDs
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to the driver for background scanning, but could simply send a list using
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configured networks. However, NM currently does not send *all* configured
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connections' SSIDs to the supplicant, so that's something we should do first
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to optimize connection times. To do this, NM would need to order all networks
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using the NM timestamp and convert that into a supplicant priority number, which
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would need to be adjusted periodically when the timestamp was updated. This
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would involve tracking each network (exposed by the supplicant as a D-Bus
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object) and making sure they were added, deleted, and updated when the backing
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NMConnection objects changed. One complication is that the supplicant
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requires secrets for various network types when the network is added via D-Bus,
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and NetworkManager might not have those secrets yet. We may need to modify
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the supplicant allow for *all* secrets (PSKs, WEP keys, etc) to be requested
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on-demand, not just EAP secrets like 802.1x passwords. We then need to fix
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up the supplicant's D-Bus interface to actually send requests for secrets out
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over D-Bus (like wpa_supplicant_eap_param_needed() does for the socket-based
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control interface) and to handle the resulting reply from a D-Bus client like
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wpa_supplicant_ctrl_iface_ctrl_rsp() does.
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With the secrets request stuff and priority handling in place, wpa_supplicant
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would control network selection and roaming (based on the priorities NM gave it
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of course) instead of NetworkManager itself, and hopefully lead to a faster WiFi
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connection process.
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2) single-device-at-a-time with overlapping connections: this is also probably
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the best route to go for desktop use-cases as well. Instead of bringing all
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available connections up, only bring up the "best" connection at any given
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