machine/serverle: add wifi reconnect

machines/serverle/hardware-configuration.nix

@@ -31,7 +31,4 @@
     # remove with 23.05
     kernelPackages = pkgs.unstable.linuxKernel.packages.linux_rpi4;
   };
-
-  # Fix wifi disconnect
-  networking.networkmanager.wifi.powersave = false;
 }

machines/serverle/wifi.nix

@@ -1,6 +1,38 @@
-{ config, ... }:
+{ config, pkgs, ... }:
 {
   sops.secrets."wifi/bismarck" = {
     path = "/etc/NetworkManager/system-connections/Bismarck WLAN.nmconnection";
   };
+
+  # Try fix wifi disconnect
+  networking.networkmanager.wifi.powersave = false;
+  networking.networkmanager.wifi.scanRandMacAddress = false;
+
+  # pragmatic fix for wifi loss
+  systemd.timers."reconnect-wifi" = {
+    wantedBy = [ "timers.target" ];
+    timerConfig = {
+      OnBootSec = "5m";
+      OnUnitActiveSec = "5m";
+      Unit = "reconnect-wifi.service";
+    };
+  };
+
+  systemd.services."reconnect-wifi" = {
+    script = ''
+      set -eu
+
+      ${pkgs.iputils.out}/bin/ping -q -w 5 -c 2 192.168.178.1 2> /dev/null
+
+      if [ $? != 0 ]
+      then
+        ${pkgs.coreutils}/bin/echo "reconnect wifi"
+        ${pkgs.networkmanager}/bin/nmcli connection up 'Bismarck WLAN'
+      fi
+    '';
+    serviceConfig = {
+      Type = "oneshot";
+      User = "root";
+    };
+  };
 }