Hi Luiz,
On Tue, Sep 8, 2015 at 10:40 AM, Jakub Pawlowski <jpawlowski@xxxxxxxxxx> wrote:
> Hi Luiz,
>
> This patch fixes all my issues with writing just after connecting.
> Thanks alot!
>
So reading and writing works perfectly, even better than I fought - I
have some short flows that execute before services get re-discovered,
but registering for notifications just after connection fails.
I can call DBus method register for notifications before I connect ,
and request will succeed, but I would really be registered for
notifications after btd_gatt_client_ready is called.
This cause a race condition:
1. App Call DBus register for notifications.
2. App call Connect on Device.
3. App Write - write succeds immediately.
4. Device sends back notification which I don't receive in App (I can
see it coming in btmon).
5. Now btd_gatt_client_ready is called, and App is really being
registered for notifications (too late).
I'm working on fixing that. It whould require registering for
notifications right after connecting, before serivces get discovered.
> On Tue, Sep 8, 2015 at 5:23 AM, Luiz Augusto von Dentz
> <luiz.dentz@xxxxxxxxx> wrote:
>> From: Luiz Augusto von Dentz <luiz.von.dentz@xxxxxxxxx>
>>
>> Upon reconnecting the attributes may already be available from cache
>> which mean the client would be able to issue commands while discovery
>> is not complete thus btd_gatt_client_ready was not called yet.
>>
>> To fix now btd_gatt_client_ready is split into btd_gatt_client_connected
>> which is called whenever connected leaving btd_gatt_client_ready to only
>> deal with exporting services found during the discovery.
>> ---
>> src/device.c | 2 ++
>> src/gatt-client.c | 24 +++++++++++++++++-------
>> src/gatt-client.h | 1 +
>> 3 files changed, 20 insertions(+), 7 deletions(-)
>>
>> diff --git a/src/device.c b/src/device.c
>> index dc362d9..2102f23 100644
>> --- a/src/device.c
>> +++ b/src/device.c
>> @@ -4602,6 +4602,8 @@ static void gatt_client_init(struct btd_device *device)
>> }
>>
>> device->gatt_cache_used = !gatt_db_isempty(device->db);
>> +
>> + btd_gatt_client_connected(device->client_dbus);
>> }
>>
>> static void gatt_server_init(struct btd_device *device, struct gatt_db *db)
>> diff --git a/src/gatt-client.c b/src/gatt-client.c
>> index d8a3429..225aa42 100644
>> --- a/src/gatt-client.c
>> +++ b/src/gatt-client.c
>> @@ -1825,20 +1825,14 @@ fail:
>>
>> void btd_gatt_client_ready(struct btd_gatt_client *client)
>> {
>> - struct bt_gatt_client *gatt;
>> -
>> if (!client)
>> return;
>>
>> - gatt = btd_device_get_gatt_client(client->device);
>> - if (!gatt) {
>> + if (!client->gatt) {
>> error("GATT client not initialized");
>> return;
>> }
>>
>> - bt_gatt_client_unref(client->gatt);
>> - client->gatt = bt_gatt_client_ref(gatt);
>> -
>> client->ready = true;
>>
>> DBG("GATT client ready");
>> @@ -1852,6 +1846,22 @@ void btd_gatt_client_ready(struct btd_gatt_client *client)
>> queue_foreach(client->all_notify_clients, register_notify, client);
>> }
>>
>> +void btd_gatt_client_connected(struct btd_gatt_client *client)
>> +{
>> + struct bt_gatt_client *gatt;
>> +
>> + gatt = btd_device_get_gatt_client(client->device);
>> + if (!gatt) {
>> + error("GATT client not initialized");
>> + return;
>> + }
>> +
>> + DBG("Device connected.");
>> +
>> + bt_gatt_client_unref(client->gatt);
>> + client->gatt = bt_gatt_client_ref(gatt);
>> +}
>> +
>> void btd_gatt_client_service_added(struct btd_gatt_client *client,
>> struct gatt_db_attribute *attrib)
>> {
>> diff --git a/src/gatt-client.h b/src/gatt-client.h
>> index a18db17..92a9255 100644
>> --- a/src/gatt-client.h
>> +++ b/src/gatt-client.h
>> @@ -23,6 +23,7 @@ struct btd_gatt_client *btd_gatt_client_new(struct btd_device *device);
>> void btd_gatt_client_destroy(struct btd_gatt_client *client);
>>
>> void btd_gatt_client_ready(struct btd_gatt_client *client);
>> +void btd_gatt_client_connected(struct btd_gatt_client *client);
>> void btd_gatt_client_service_added(struct btd_gatt_client *client,
>> struct gatt_db_attribute *attrib);
>> void btd_gatt_client_service_removed(struct btd_gatt_client *client,
>> --
>> 2.4.3
>>
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