dabba: make operation error code queryable.

Signed-off-by: Emmanuel Roullit <emmanuel.roullit@gmail.com>
doc: add capture settings function doxygen header.

Signed-off-by: Emmanuel Roullit <emmanuel.roullit@gmail.com>
doc: add capture cli function doxygen header.

Signed-off-by: Emmanuel Roullit <emmanuel.roullit@gmail.com>
doc: add cli helper function doxygen header.

Signed-off-by: Emmanuel Roullit <emmanuel.roullit@gmail.com>