== Response Codes ==
100 Information
200 Command succeeded, no extra information
-201 Command succeeded, array follows (<length> <items> <items> ...)
+201 Command succeeded, multiple lines follow (<length>)
202 Command succeeded, per-command format
400 Unknown Command
401 Not Authenticated (or Authentication failure)
--- Get Item list ---
c ENUM_ITEMS\n
-s 201 Items <count> <item_id> <item_id> ...\n
+s 201 Items <count>\n
+s 202 Item <item_id> <price> <description>\n
+ ...
+s 200 List End\n
--- Get Item Information ---
c ITEM_INFO <item_id>\n
s 202 Item <item_id> <price> <description>\n
+
--- Get Users' Balances ---
-c ENUM_USERS[ <max balance>]\n
+ <max balance> and <min balance> can be '-' to indicate "none"
+c ENUM_USERS[ <min balance> [<max balance>]]\n
s 201 Users <count>\n
s 202 User <username> <balance> <flags>\n
...
-s 200 List End
+s 200 List End\n
--- Get a User's Balance ---
c USER_INFO\n
s 202 User <username> <balance> <flags>\n
+
+--- Add a new user ---
+c USER_ADD <username>\n
+s 200 User Added\n or 403 Not Wheel\n or 404 User Exists\n
+--- Set user flags ---
+ <flags> is a comma-separated list of flag values (optionally preceded by
+ - to remove the flag) Valid values are: user,coke,wheel,meta,disabled,door
+c USER_FLAGS <username> <flags>\n
+s 200 User Updated\n or 403 Not Wheel\n or 404 Bad User\n or 407 Unknown Flags\n