[PATCH v2] Implement ATT handle indications

[Elvis PfÃtzenreuter <epx@xxxxxxxxxxx>]

---
 src/attrib-server.c |   69 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 69 insertions(+), 0 deletions(-)

diff --git a/src/attrib-server.c b/src/attrib-server.c
index 5f645bb..f683707 100644
--- a/src/attrib-server.c
+++ b/src/attrib-server.c
@@ -54,6 +54,8 @@ struct gatt_channel {
 	GSList *configs;
 	GSList *notify;
 	GSList *indicate;
+	gboolean outstanding_indication;
+	GSList *pending_indications;
 	GAttrib *attrib;
 	guint mtu;
 	guint id;
@@ -770,12 +772,58 @@ static void channel_disconnect(void *user_data)
 
 	g_slist_free(channel->notify);
 	g_slist_free(channel->indicate);
+	g_slist_free(channel->pending_indications);
 	g_slist_foreach(channel->configs, (GFunc) g_free, NULL);
 	g_slist_free(channel->configs);
 
 	g_free(channel);
 }
 
+static void attrib_resume_indications(struct gatt_channel *channel);
+
+static void attrib_indicate_client_cb(guint8 status, const guint8 *pdu,
+					guint16 len, gpointer user_data)
+{
+	struct gatt_channel *channel = user_data;
+
+	if (status)
+		return;
+
+	attrib_resume_indications(channel);
+}
+
+static void attrib_indicate_client(struct gatt_channel *channel,
+					struct attribute *attr)
+{
+	uint8_t pdu[ATT_MAX_MTU];
+	uint16_t len;
+
+	len = enc_indication(attr, pdu, channel->mtu);
+	if (len == 0)
+		return;
+
+	channel->outstanding_indication = TRUE;
+
+	g_attrib_send(channel->attrib, 0, pdu[0], pdu, len,
+		attrib_indicate_client_cb, channel, NULL);
+}
+
+static void attrib_resume_indications(struct gatt_channel *channel)
+{
+	struct attribute *a;
+
+	channel->outstanding_indication = FALSE;
+
+	if (!channel->pending_indications)
+		return;
+
+	a = channel->pending_indications->data;
+	channel->pending_indications =
+		g_slist_remove(channel->pending_indications, a);
+
+	attrib_indicate_client(channel, a);
+}
+
 static void channel_handler(const uint8_t *ipdu, uint16_t len,
 							gpointer user_data)
 {
@@ -872,6 +920,8 @@ static void channel_handler(const uint8_t *ipdu, uint16_t len,
 		length = find_by_type(start, end, &uuid, value, vlen,
 							opdu, channel->mtu);
 		break;
+	case ATT_OP_HANDLE_CNF:
+		return;
 	case ATT_OP_READ_MULTI_REQ:
 	case ATT_OP_PREP_WRITE_REQ:
 	case ATT_OP_EXEC_WRITE_REQ:
@@ -948,6 +998,15 @@ static void confirm_event(GIOChannel *io, void *user_data)
 	return;
 }
 
+static void attrib_sched_indication(struct gatt_channel *channel,
+							struct attribute *a)
+{
+	if (!g_slist_find_custom(channel->pending_indications, a,
+							attribute_cmp))
+		channel->pending_indications =
+			g_slist_append(channel->pending_indications, a);
+}
+
 static void attrib_notify_clients(struct attribute *attr)
 {
 	guint handle = attr->handle;
@@ -969,6 +1028,15 @@ static void attrib_notify_clients(struct attribute *attr)
 			g_attrib_send(channel->attrib, 0, pdu[0], pdu, len,
 							NULL, NULL, NULL);
 		}
+
+		/* Indication */
+		if (g_slist_find_custom(channel->indicate,
+				GUINT_TO_POINTER(handle), handle_cmp) != NULL) {
+			if (channel->outstanding_indication)
+				attrib_sched_indication(channel, attr);
+			else
+				attrib_indicate_client(channel, attr);
+		}
 	}
 }
 
@@ -1111,6 +1179,7 @@ void attrib_server_exit(void)
 
 		g_slist_free(channel->notify);
 		g_slist_free(channel->indicate);
+		g_slist_free(channel->pending_indications);
 		g_slist_foreach(channel->configs, (GFunc) g_free, NULL);
 		g_slist_free(channel->configs);
 
-- 
1.7.1

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