Sets the type of @notification to @category. Categories have a main
type like email, im or device and can have a detail separated
by a ., e.g. im.received or email.arrived. Setting the category
helps the notification server to select proper feedback to the user.
Sets the type of @notification to @category. Categories have a main type like email, im or device and can have a detail separated by a ., e.g. im.received or email.arrived. Setting the category helps the notification server to select proper feedback to the user.
Standard categories are listed in the specification.