fix: and add data to ubnteeprom (#10)

* Fixup incorrect device serial #
* Add more system info about the NVRs
* Start using ubnteeprom in more spots
* Also do some minor BT house cleaning

overlay/filesystem/usr/lib/python3/dist-packages/ubnthelpers.py

@@ -5,17 +5,6 @@ from functools import lru_cache
 A handful of Ubiquiti Unifi device specific functions
 """
 
-UBNTHAL_PATH = "/proc/ubnthal/system.info"
-
-
 @lru_cache(None)
 def get_ubnt_shortname() -> str:
-    try:
-        with open(UBNTHAL_PATH, "r") as f:
-            ubnthal_model = [i for i in f.readlines() if i.startswith("shortname=")][0]
-        return ubnthal_model.lstrip("shortname=").rstrip("\n")
-    except FileNotFoundError:
-        print(
-            f"Error: unable to open {UBNTHAL_PATH}; is the ubnthal kernel module loaded?!"
-        )
-        raise
+    return os.popen("ubnteeprom -systeminfo -key shortname").read().rstrip("\n")