static void read_by_grp_type_cb(struct bt_att_chan *chan, uint8_t opcode,
					const void *pdu, uint16_t length,
					void *user_data)
{
	struct bt_gatt_server *server = user_data;
	uint16_t start, end;
	bt_uuid_t type;
	bt_uuid_t prim, snd;
	uint16_t mtu = bt_att_get_mtu(server->att);
	uint8_t rsp_pdu[mtu];
	uint16_t rsp_len;
	uint8_t ecode = 0;
	uint16_t ehandle = 0;
	struct queue *q = NULL;

	if (length != 6 && length != 20) {
		ecode = BT_ATT_ERROR_INVALID_PDU;
		goto error;
	}

	q = queue_new();

	start = get_le16(pdu);
	end = get_le16(pdu + 2);
	get_uuid_le(pdu + 4, length - 4, &type);

	util_debug(server->debug_callback, server->debug_data,
				"Read By Grp Type - start: 0x%04x end: 0x%04x",
				start, end);

	if (!start || !end) {
		ecode = BT_ATT_ERROR_INVALID_HANDLE;
		goto error;
	}

	ehandle = start;

	if (start > end) {
		ecode = BT_ATT_ERROR_INVALID_HANDLE;
		goto error;
	}

	/*
	 * GATT defines that only the <<Primary Service>> and
	 * <<Secondary Service>> group types can be used for the
	 * "Read By Group Type" request (Core v4.1, Vol 3, sec 2.5.3). Return an
	 * error if any other group type is given.
	 */
	bt_uuid16_create(&prim, GATT_PRIM_SVC_UUID);
	bt_uuid16_create(&snd, GATT_SND_SVC_UUID);
	if (bt_uuid_cmp(&type, &prim) && bt_uuid_cmp(&type, &snd)) {
		ecode = BT_ATT_ERROR_UNSUPPORTED_GROUP_TYPE;
		goto error;
	}

	gatt_db_read_by_group_type(server->db, start, end, type, q);

	if (queue_isempty(q)) {
		ecode = BT_ATT_ERROR_ATTRIBUTE_NOT_FOUND;
		goto error;
	}

	if (!encode_read_by_grp_type_rsp(server->db, q, server->att, mtu,
							rsp_pdu, &rsp_len)) {
		ecode = BT_ATT_ERROR_UNLIKELY;
		goto error;
	}

	queue_destroy(q, NULL);

	bt_att_chan_send_rsp(chan, BT_ATT_OP_READ_BY_GRP_TYPE_RSP,
						rsp_pdu, rsp_len);

	return;

error:
	queue_destroy(q, NULL);
	bt_att_chan_send_error_rsp(chan, opcode, ehandle, ecode);
}
static void read_by_grp_type_cb(struct bt_att_chan *chan, uint8_t opcode,
					const void *pdu, uint16_t length,
					void *user_data)
{
	struct bt_gatt_server *server = user_data;
	uint16_t start, end;
	bt_uuid_t type;
	bt_uuid_t prim, snd;
	uint16_t mtu = bt_att_get_mtu(server->att);
	uint8_t rsp_pdu[mtu];
	uint16_t rsp_len;
	uint8_t ecode = 0;
	uint16_t ehandle = 0;
	struct queue *q = NULL;

	if (length != 6 && length != 20) {
		ecode = BT_ATT_ERROR_INVALID_PDU;
		goto error;
	}

	q = queue_new();

	start = get_le16(pdu);
	end = get_le16(pdu + 2);
	get_uuid_le(pdu + 4, length - 4, &type);

	util_debug(server->debug_callback, server->debug_data,
				"Read By Grp Type - start: 0x%04x end: 0x%04x",
				start, end);

	if (!start || !end) {
		ecode = BT_ATT_ERROR_INVALID_HANDLE;
		goto error;
	}

	ehandle = start;

	if (start > end) {
		ecode = BT_ATT_ERROR_INVALID_HANDLE;
		goto error;
	}

	 
	bt_uuid16_create(&prim, GATT_PRIM_SVC_UUID);
	bt_uuid16_create(&snd, GATT_SND_SVC_UUID);
	if (bt_uuid_cmp(&type, &prim) && bt_uuid_cmp(&type, &snd)) {
		ecode = BT_ATT_ERROR_UNSUPPORTED_GROUP_TYPE;
		goto error;
	}

	gatt_db_read_by_group_type(server->db, start, end, type, q);

	if (queue_isempty(q)) {
		ecode = BT_ATT_ERROR_ATTRIBUTE_NOT_FOUND;
		goto error;
	}

	if (!encode_read_by_grp_type_rsp(server->db, q, server->att, mtu,
							rsp_pdu, &rsp_len)) {
		ecode = BT_ATT_ERROR_UNLIKELY;
		goto error;
	}

	queue_destroy(q, NULL);

	bt_att_chan_send_rsp(chan, BT_ATT_OP_READ_BY_GRP_TYPE_RSP,
						rsp_pdu, rsp_len);

	return;

error:
	queue_destroy(q, NULL);
	bt_att_chan_send_error_rsp(chan, opcode, ehandle, ecode);
}