Root cause: The systemd service hardening blocked AF_NETLINK sockets,
preventing IP address discovery on standalone nodes. The proxy could
only discover hostnames, causing node_not_cluster_member rejections
when users configured Pulse with IP addresses.
Changes:
1. Add AF_NETLINK to RestrictAddressFamilies in all systemd services
- pulse-sensor-proxy.service
- install-sensor-proxy.sh (both modes)
- pulse-sensor-cleanup.service
2. Replace shell-based 'ip addr' with Go native net.Interfaces() API
- More reliable and doesn't require external commands
- Works even with strict systemd restrictions
- Properly filters loopback, link-local, and down interfaces
3. Improve error logging and user guidance
- Warn when no IP addresses can be discovered
- Provide clear instructions about allowed_nodes workaround
- Include address counts in logs for debugging
This fix ensures standalone Proxmox nodes can properly validate
temperature requests by IP address without requiring manual
allowed_nodes configuration.
ca8cc0844a