If included services has 128 bit UUID, it won't be returned in READ_BY_TYPE_RSP. To get UUID READ_REQUEST is used. This procedure is described in CORE SPEC 4.5.1 "Find Included Services".
9d64bde shared/gatt: Discover included services 128 bit UUIDS
src/shared/gatt-helpers.c | 167 ++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 166 insertions(+), 1 deletion(-)
Upstream: git.kernel.org