Support for "subscribe" command was added years ago in the commit
453b87f6315f ("cli: add support for subscribing to objects"). Document
its usage.
Cc: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
"Commands:\n"
" - list [<path>] List objects\n"
" - call <path> <method> [<message>] Call an object method\n"
+ " - subscribe <path> [<path>...] Subscribe to object(s) notifications\n"
" - listen [<path>...] Listen for events\n"
" - send <type> [<message>] Send an event\n"
" - wait_for <object> [<object>...] Wait for multiple objects to appear on ubus\n"