Index: dialin/hd/air_bubbles.py
===================================================================
diff -u -r0a84621b0b0f807dd4019fa9ec44cc3efb7bb30a -r77e28fd838640e057e7a79c624345b34fd8545f9
--- dialin/hd/air_bubbles.py	(.../air_bubbles.py)	(revision 0a84621b0b0f807dd4019fa9ec44cc3efb7bb30a)
+++ dialin/hd/air_bubbles.py	(.../air_bubbles.py)	(revision 77e28fd838640e057e7a79c624345b34fd8545f9)
@@ -182,36 +182,46 @@
         Constructs and sends the air bubbles data broadcast interval override command
         Constraints:
             Must be logged into HD.
-            Given interval must be non-zero and a multiple of the HD priority task interval (10 ms).
+            Given interval must be positive non-zero and a multiple of the HD priority task interval (50 ms).
 
         @param ms:  integer - interval (in ms) to override with
         @param reset:  integer - 1 to reset a previous override, 0 to override
         @return: 1 if successful, zero otherwise
         """
 
-        rst = integer_to_bytearray(reset)
-        mis = integer_to_bytearray(ms)
-        payload = rst + mis
+        if ms > 0 and ms % 50 == 0:
+            rst = integer_to_bytearray(reset)
+            mis = integer_to_bytearray(ms)
+            payload = rst + mis
 
-        message = DenaliMessage.build_message(channel_id=DenaliChannels.dialin_to_hd_ch_id,
-                                              message_id=MsgIds.MSG_ID_HD_BUBBLES_DATA_SEND_INTERVAL_OVERRIDE.value,
-                                              payload=payload)
+            message = DenaliMessage.build_message(channel_id=DenaliChannels.dialin_to_hd_ch_id,
+                                                  message_id=MsgIds.MSG_ID_HD_BUBBLES_DATA_SEND_INTERVAL_OVERRIDE.value,
+                                                  payload=payload)
 
-        self.logger.debug("Override HD air bubbles data broadcast interval to"+ms+"ms")
+            self.logger.debug("Override HD air bubbles data broadcast interval to"+ms+"ms")
 
-        # Send message
-        received_message = self.can_interface.send(message)
+            # Send message
+            received_message = self.can_interface.send(message)
 
-        # If there is content...
-        if received_message is not None:
-            if reset == RESET:
-                str_res = "reset back to normal: "
+            # If there is content...
+            if received_message is not None:
+                if reset == RESET:
+                    str_res = "reset back to normal: "
+                else:
+                    str_res = str(ms) + " ms: "
+                self.logger.debug("Air bubbles data broadcast interval overridden to " + str_res +
+                      str(received_message['message'][DenaliMessage.PAYLOAD_START_INDEX]))
+                # response payload is OK or not OK
+                return received_message['message'][DenaliMessage.PAYLOAD_START_INDEX]
             else:
-                str_res = str(ms) + " ms: "
-            self.logger.debug("Air bubbles data broadcast interval overridden to " + str_res +
-                  str(received_message['message'][DenaliMessage.PAYLOAD_START_INDEX]))
-            # response payload is OK or not OK
-            return received_message['message'][DenaliMessage.PAYLOAD_START_INDEX]
+                self.logger.debug("Timeout!!!!")
+                return False
+        elif ms <= 0:
+            self.logger.debug("ms must be positive non-zero.")
+            return False
+        elif ms % 50 != 0:
+            self.logger.debug("ms must be a multiple of 50.")
+            return False
         else:
-            self.logger.debug("Timeout!!!!")
+            self.logger.debug("ms must be an integer.")
             return False