When the characteristic requires Write Request, the ATT response should
be sent after receiving the reply for the Set method call.
---
src/gatt-dbus.c | 67 +++++++++++++++++++++++++++++++++++++++++++++++++++------
1 file changed, 61 insertions(+), 6 deletions(-)
diff --git a/src/gatt-dbus.c b/src/gatt-dbus.c
index 6483d76..830eaf8 100644
--- a/src/gatt-dbus.c
+++ b/src/gatt-dbus.c
@@ -56,6 +56,11 @@ struct external_app {
unsigned int watch;
};
+struct proxy_write_data {
+ btd_attr_write_result_t result_cb;
+ void *user_data;
+};
+
/*
* Attribute to Proxy hash table. Used to map incoming
* ATT operations to its external characteristic proxy.
@@ -181,8 +186,30 @@ static void proxy_read_cb(struct btd_attribute *attr,
static void proxy_write_reply(const DBusError *derr, void *user_data)
{
- if (derr)
- DBG("Write reply: %s", derr->message);
+ struct proxy_write_data *wdata = user_data;
+ int err = 0;
+
+ /*
+ * Security requirements shall be handled by the core. If external
+ * applications returns an error, the reasons will be restricted to
+ * invalid argument or application specific errors.
+ */
+
+ if (dbus_error_is_set(derr) == FALSE)
+ goto done;
+
+ DBG("Write reply: %s", derr->message);
+
+ if (dbus_error_has_name(derr, DBUS_ERROR_NO_REPLY))
+ err = -ETIMEDOUT;
+ else if (dbus_error_has_name(derr, ERROR_INTERFACE ".InvalidArguments"))
+ err = -EINVAL;
+ else
+ err = -EPROTO;
+
+done:
+ if (wdata && wdata->result_cb)
+ wdata->result_cb(err, wdata->user_data);
}
static void proxy_write_cb(struct btd_attribute *attr,
@@ -193,16 +220,44 @@ static void proxy_write_cb(struct btd_attribute *attr,
GDBusProxy *proxy;
proxy = g_hash_table_lookup(proxy_hash, attr);
- if (proxy == NULL)
- /* FIXME: Attribute not found */
+ if (proxy == NULL) {
+ result(-ENOENT, user_data);
return;
+ }
- g_dbus_proxy_set_property_array(proxy, "Value", DBUS_TYPE_BYTE,
+ /*
+ * "result" callback defines if the core wants to receive the
+ * operation result, allowing to select ATT Write Request or Write
+ * Command. Descriptors requires Write Request operation. For
+ * Characteristics, the implementation will define which operations
+ * are allowed based on the properties/flags.
+ * TODO: Write Long Characteristics/Descriptors.
+ */
+
+ if (result) {
+ struct proxy_write_data *wdata;
+
+ wdata = g_new0(struct proxy_write_data, 1);
+ wdata->result_cb = result;
+ wdata->user_data = user_data;
+
+ g_dbus_proxy_set_property_array(proxy, "Value", DBUS_TYPE_BYTE,
+ value, len, proxy_write_reply,
+ wdata, g_free);
+ } else {
+ /*
+ * Caller is not interested in the Set method call result.
+ * This flow implements the ATT Write Command scenario, where
+ * the remote doesn't receive ATT response.
+ */
+ g_dbus_proxy_set_property_array(proxy, "Value", DBUS_TYPE_BYTE,
value, len, proxy_write_reply,
NULL, NULL);
+ }
- DBG("Server: Write characteristic callback %s",
+ DBG("Server: Write attribute callback %s",
g_dbus_proxy_get_path(proxy));
+
}
static int register_external_service(const struct external_app *eapp,
--
1.8.3.1
--
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