To update message filtration settings for a unit (the Advanced tab):

svc=unit/update_messages_filter

Parameters:

{
	"itemId":<long>,	/* unit ID */
	"enabled":<bool>,	/* enable/disable filtration */
	"skipInvalid":<bool>,	/* skip or not invalid messages */
	"minSats":<ubyte>,	/* minimum satellites */
	"maxHdop":<double>,	/* maximum HDOP value */
	"maxSpeed":<uint>	/* maximum speed value */
}

Return value:

{}	/* OK */