lib/hid: Work around HID bug in returned XML records

Includes:
- lib/hid: Don't send recordCount as -1, fixes #4

lib/hid/DoorController.py

@@ -135,17 +135,24 @@ class DoorController():
         recordCount = 0
         moreRecords = True
 
+        # note: all the "+/-1" bits are to work around a bug where the
+        # last returned entry is incomplete. There is probably a
+        # better way to do this, but for now I just get the last entry
+        # again in the next request. I suspect this probably ends
+        # poorly if the numbers line up poorly (ie an exact multiple
+        # of the returned record limit)
         while moreRecords:
             res = self.doXMLRequest(ROOT(
                 req({
                     "action": "LR",
-                    "recordCount": str(count - recordCount),
+                    "recordCount": str(count - recordCount + 1),
-                    "recordOffset": str(recordCount),
+                    "recordOffset": str(recordCount - 1
+                                        if recordCount > 0 else 0),
                     **params
                 })))
-            result += list(res[0])
+            result = result[:-1] + list(res[0])
 
-            recordCount += int(res[0].get('recordCount'))
+            recordCount += int(res[0].get('recordCount')) - 1
             moreRecords = res[0].get('moreRecords') == 'true'
 
         return result