Merge pull request 'added datarate default for ccsds submodes' (#178) from kranz_ccsds_submodes into main

Reviewed-on: #178
Reviewed-by: Robin Müller <muellerr@irs.uni-stuttgart.de>

eive_tmtc/tmtc/com/ccsds_handler.py

@@ -45,9 +45,10 @@ class ActionId(enum.IntEnum):
 
 class Submode(enum.IntEnum):
     # Informative, do not command this.
-    OFF = 0
+    UNSET = 0
     DATARATE_LOW = 1
     DATARATE_HIGH = 2
+    DATARATE_DEFAULT = 3
 
 
 class OpCode: