hardware.py: remove NM dbus

[andiradulescu]

Part of #37752

[github-actions]

Process replay diff report

Replays driving segments through this PR and compares the behavior to master.
Please review any changes carefully to ensure they are expected.

✅ 0 changed, 66 passed, 0 errors

[adeebshihadeh]

Can we replace the subprocess calls with fs reads?

comma@comma-d3c3ad4b:/data/openpilot$ cat /proc/net/route
Iface	Destination	Gateway 	Flags	RefCnt	Use	Metric	Mask		MTU	Window	IRTT
wlan0	00000000	0138A8C0	0003	0	0	600	00000000	00	      0
wlan0	0038A8C0	00000000	0001	0	0	600	00F8FFFF	00	      0
comma@comma-d3c3ad4b:/data/openpilot$ cat /proc/net/wireless
Inter-| sta-|   Quality        |   Discarded packets               | Missed | WE
 face | tus | link level noise |  nwid  crypt   frag  retry   misc | beacon | 22
 wlan0: 0000    0     0     0        0      0      0      0      0        0
  p2p0: 0000    0     0     0        0      0      0      0      0        0

[andiradulescu]

• /proc/net/route - good call, done
• /proc/net/wireless - doesn't seem to work for the wpa_cli signal_poll replacement, quality / level fields are not populated, so it reads all zeros even when associated (your paste shows that too wlan0: 0000 0 0 0)

[adeebshihadeh]

what about /data/etc/NetworkManager/system-connections?

[andiradulescu]

updated now to handle both paths:

• AGNOS NM wifis are saved as netplan files which generate nmconnection files (only) in /run
• on Void/vamOS there's no netplan and only the /data path is used

[adeebshihadeh]

how do we get the guess? don't think it's written out to the file?

[andiradulescu]

removed the guessing. found an Android phone that its hotspot shows GUESS_YES and it's not written to the nmconnection file, it's only avertised by NM runtime.

so, with this change, Android hotspots will no longer be auto-flagged as metered.

my intention now is auto-detection to be re-added in the No NM-era PRs once openpilot owns the DHCP code path.

if we want to keep auto-flagging in this PR, then we could replace the file read with nmcli.

[andiradulescu]

added a nmcli fallback for the guess