diff mbox series

[BlueZ,4/5] gatt: Emit PropertiesChanged("MTU") when MTU is exchanged

Message ID 20210928235447.3077055-4-luiz.dentz@gmail.com (mailing list archive)
State Accepted
Delegated to: Brian Gix
Headers show
Series [BlueZ,1/5] gatt-api: Add MTU property to GattCharacteristic1 | expand

Checks

Context Check Description
tedd_an/checkpatch success Checkpatch PASS
tedd_an/gitlint success Gitlint PASS

Commit Message

Luiz Augusto von Dentz Sept. 28, 2021, 11:54 p.m. UTC 
From: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

This notifies client when the ATT MTU changes.
---
 src/gatt-client.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)
diff mbox series

Patch

diff --git a/src/gatt-client.c b/src/gatt-client.c
index 5b10cbfa0..de18bea97 100644
--- a/src/gatt-client.c
+++ b/src/gatt-client.c
@@ -104,6 +104,7 @@  struct characteristic {
 	char *path;
 
 	unsigned int ready_id;
+	unsigned int exchange_id;
 	struct sock_io *write_io;
 	struct sock_io *notify_io;
 
@@ -1707,6 +1708,8 @@  static void remove_client(void *data)
 static void characteristic_free(void *data)
 {
 	struct characteristic *chrc = data;
+	struct bt_gatt_client *gatt = chrc->service->client->gatt;
+	struct bt_att *att;
 
 	/* List should be empty here */
 	queue_destroy(chrc->descs, NULL);
@@ -1723,15 +1726,29 @@  static void characteristic_free(void *data)
 
 	queue_destroy(chrc->notify_clients, remove_client);
 
+	att = bt_gatt_client_get_att(gatt);
+	if (att)
+		bt_att_unregister_exchange(att, chrc->exchange_id);
+
 	g_free(chrc->path);
 	free(chrc);
 }
 
+static void att_exchange(uint16_t mtu, void *user_data)
+{
+	struct characteristic *chrc = user_data;
+
+	g_dbus_emit_property_changed(btd_get_dbus_connection(), chrc->path,
+					GATT_CHARACTERISTIC_IFACE, "MTU");
+}
+
 static struct characteristic *characteristic_create(
 						struct gatt_db_attribute *attr,
 						struct service *service)
 {
 	struct characteristic *chrc;
+	struct bt_gatt_client *gatt = service->client->gatt;
+	struct bt_att *att;
 	bt_uuid_t uuid;
 
 	chrc = new0(struct characteristic, 1);
@@ -1770,6 +1787,11 @@  static struct characteristic *characteristic_create(
 		return NULL;
 	}
 
+	att = bt_gatt_client_get_att(gatt);
+	if (att)
+		chrc->exchange_id = bt_att_register_exchange(att, att_exchange,
+								chrc, NULL);
+
 	DBG("Exported GATT characteristic: %s", chrc->path);
 
 	return chrc;