fix(ble/bluedroid): Don't log error on 16/128-bit UUID mixed descriptors (IDFGH-14175)

[nebkat]

Description

If multiple descriptors are defined for a characteristic where there is a mix of 16-bit and 128-bit UUIDs, an error log was printed during the discovery process.

E (27577) BT_GATT: format mismatch

As per BLUETOOTH CORE SPECIFICATION Version 5.4 | Vol 3, Part F pages 1419/1420:

If sequential attributes have differing UUID sizes, the ATT_FIND_INFORMATION_RSP PDU shall end with the first attribute of the pair even though this may mean that it is not filled with the maximum possible amount of (handle, UUID) pairs. This is because it is not possible to include attributes with differing UUID sizes into a single response packet. In this situation, the client must use another ATT_FIND_INFORMATION_REQ PDU with its starting handle updated to fetch the second attribute of the pair and any further ones in its original request.

In other words, if we start returning 16-bit UUID attributes and we encounter 128-bit (or vice-versa) we should simply return what we have so far, and the client should send a new ATT_FIND_INFORMATION_REQ. There is no need for the error log.

Also, interestingly, the return code is ignored anyway:

esp-idf/components/bt/host/bluedroid/stack/gatt/gatt_sr.c

Lines 1016 to 1020 in 030c995

	reason = gatt_build_find_info_rsp(p_rcb, p_msg, &buf_len, s_hdl, e_hdl);
	if (reason == GATT_NO_RESOURCES) {
	reason = GATT_SUCCESS;
	break;
	}

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Here are the details:

• master: fed1d41
• v5.4: 7790c95832a3df80b518a38fbb83cb76774b6924
• v5.3: ff6425d
• v5.2: 72527f85ea6d3016b55e0da9bb59d199a4d4f742
• v5.1: c8adc1a
• v5.0: 3e48f50e4ec3bc8a3f55cb12f887f53b500f5b98