From: Luiz Augusto von Dentz <luiz.von.dentz@xxxxxxxxx>
The group data is as follow:
Attribute Handle (2 octets) End Group Handle (2 octets) Attribute Value
(Length - 4) octets
But since only primary and secondary can be used in ATT Read by Group
Type Request the value is garanteed to be a UUID:
< ACL Data TX: Handle 3585 flags 0x00 dlen 24
ATT: Read By Group Type Response (0x11) len 19
Attribute data length: 6
Attribute group list: 3 entries
Handle range: 0x0001-0x0005
UUID: Generic Access Profile (0x1800)
Handle range: 0x0006-0x000d
UUID: Heart Rate (0x180d)
Handle range: 0x000e-0x0011
UUID: Battery Service (0x180f)
---
monitor/l2cap.c | 25 ++++++++++++++++++++++++-
1 file changed, 24 insertions(+), 1 deletion(-)
diff --git a/monitor/l2cap.c b/monitor/l2cap.c
index 55efa54..409f5f4 100644
--- a/monitor/l2cap.c
+++ b/monitor/l2cap.c
@@ -2217,12 +2217,35 @@ static void att_read_group_type_req(const struct l2cap_frame *frame)
print_uuid("Attribute group type", frame->data + 4, frame->size - 4);
}
+static void print_group_list(const char *label, uint8_t length,
+ const void *data, uint16_t size)
+{
+ uint8_t count;
+
+ if (length == 0)
+ return;
+
+ count = size / length;
+
+ print_field("%s: %u entr%s", label, count, count == 1 ? "y" : "ies");
+
+ while (size >= length) {
+ print_handle_range("Handle range", data);
+ print_uuid("UUID", data + 4, length - 4);
+
+ data += length;
+ size -= length;
+ }
+
+ packet_hexdump(data, size);
+}
+
static void att_read_group_type_rsp(const struct l2cap_frame *frame)
{
const struct bt_l2cap_att_read_group_type_rsp *pdu = frame->data;
print_field("Attribute data length: %d", pdu->length);
- print_data_list("Attribute data list", pdu->length,
+ print_group_list("Attribute group list", pdu->length,
frame->data + 1, frame->size - 1);
}
--
2.1.0
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