Add efiboot mgr and configure networking settings

global.nix

@@ -70,6 +70,9 @@
     };
   };
 
+  # Enable proper support for USB wifi/Wwan adapters.
+  hardware.usbWwan.enable = true;
+
   # You can specify here what python packages you waint available to python
   # Custom Python package with all the (Python) imports I need
   my-python-packages = python-packages: with python-packages; [ # ...
@@ -90,6 +93,7 @@
   	  nix-index
   	  git
 	    wget
+      efibootmgr
 	    ntfs3g
 
   	  # Programming Stuff, language servers etc
@@ -496,6 +500,13 @@
   	enable = true;
   };
 
+  # Disable powersave feature on network cards.
+  networking.networkmanager.wifi.powersave = false;
+
+  # Use the preserved MAC address of the network card.
+  networking.networkmanager.wifi.macAddress = "preserve";
+  networking.networkmanager.wifi.scanRandMacAddress = false;
+
   services.udev.extraRules = ''
   ## Rules file for NetMD devices and HiMD devices in NetMD mode
   ## source: https://usb-ids.gowdy.us/read/UD/054c