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Bluetooth: audio: has: Truncate Control Point notifications to ATT MTU

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This will truncate ATT notifications/indications if exceed ATT MTU size.
It is up to the client to exchange MTU.

Signed-off-by: Mariusz Skamra <mariusz.skamra@codecoup.pl>
This commit is contained in:
Mariusz Skamra 2023-10-19 10:53:54 +02:00 committed by Carles Cufí
parent b0e7a1b0ac
commit df1fd21892
1 changed files with 9 additions and 0 deletions
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9
subsys/bluetooth/audio/has.c
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@ -727,6 +727,15 @@ static void control_point_ind_complete(struct bt_conn *conn,
static int control_point_send(struct has_client *client, struct net_buf_simple *buf)
{
const uint16_t mtu_size = bt_gatt_get_mtu(client->conn);
/* PDU structure is [Opcode (1)] [Handle (2)] [...] */
const uint16_t pdu_size = 3 + buf->len;
if (mtu_size < pdu_size) {
LOG_WRN("Sending truncated control point PDU %d < %d", mtu_size, pdu_size);
buf->len -= (pdu_size - mtu_size);
}
#if defined(CONFIG_BT_HAS_PRESET_CONTROL_POINT_NOTIFIABLE)
if (bt_eatt_count(client->conn) > 0 &&
bt_gatt_is_subscribed(client->conn, preset_control_point_attr, BT_GATT_CCC_NOTIFY)) {