Gateway tile and network grouping assume every subnet is a /24 (wrong on a /22)

[ctbjdm]

Summary

On a network wider than a /24, the dashboard shows the wrong subnet and wrong usage counts. The scanner itself handles the wider network correctly (netutil.get_local_network() reads the real prefix and scan/arpplan.py rotates through the /24 blocks), but two display paths hardcode /24.

Environment

• Version: main @ 23f1500 (config.yaml 0.10.0)
• Home Assistant OS, host interface via DHCP: 10.20.2.50/22 (netmask 255.255.252.0), gateway 10.20.0.1
• Single VLAN spanning 10.20.0.0–10.20.3.255

What I see

• Gateway tile shows 10.20.0.0/24. The real network is 10.20.0.0/22.
• "Used / free" is counted against 254 hosts, and only devices whose IP starts with 10.20.0. are counted. Devices on 10.20.1.x–10.20.3.x are left out, including the Home Assistant host itself.
• Devices known to Home Assistant are grouped into four separate "networks" (10.20.0.0/24 … 10.20.3.0/24) even though they share one subnet.

Cause

1. vedetta/app/frontend/ha/js/net-rotator.js, gatewayTile() (L97–102): the subnet is built from the gateway IP's first three octets plus .0/24. SUBNET_HOSTS = 254 (L8) is a constant. The used filter is a string-prefix match on the first three octets.
2. vedetta/app/ha/passive_view.py, _net() (L99): each client's network is derived as ip + "/24". The docstring notes that the VLAN isn't in the data.

Suggested fix

The backend already knows the real CIDR (get_local_network() → e.g. 10.20.0.0/22). Expose it from /api/ha/networks or /api/ha/summary, and have the frontend use it for:

• the label shown on the tile,
• host capacity (num_addresses - 2),
• membership tests (CIDR containment instead of a string prefix).

_net() could use the same CIDR for addresses that fall inside the local network, and keep the /24 fallback only for addresses outside it.

Expected

Gateway tile shows 10.20.0.0/22, about 1022 usable hosts, and counts every device in that range. Clients in the /22 are grouped as one network.

(Addresses above are placeholders; the real network has the same shape.)

[bazfum]

I just installed and noticed this as well.

[Sived80]

Thanks a lot for confirming it, and welcome to Vedetta! The fix will be in the next release.

[Sived80]

Thank you so much for this report: clear, precise, and with the exact lines. It made the fix quick.

The gateway tile now shows the real subnet and counts every device in it, and Home Assistant clients on the same network are grouped as one. It will be in the next release.