[PATCH v2 6/6] gatt: Enable connecting to EATT channel using Ext-Flowctl mode

[Luiz Augusto von Dentz <luiz.dentz@xxxxxxxxx>]

From: Luiz Augusto von Dentz <luiz.von.dentz@xxxxxxxxx>

This makes use of BT_IO_MODE_EXT_FLOWCTL to connect to EATT channels.
---
 src/gatt-client.c | 28 +++++++++++++++++++++++++---
 1 file changed, 25 insertions(+), 3 deletions(-)

diff --git a/src/gatt-client.c b/src/gatt-client.c
index 20efb7ae9..f7e5f38f4 100644
--- a/src/gatt-client.c
+++ b/src/gatt-client.c
@@ -2185,6 +2185,9 @@ static void eatt_connect(struct btd_gatt_client *client)
 	DBG("Connection attempt to: %s", addr);
 
 	for (i = bt_att_get_channels(att); i < main_opts.gatt_channels; i++) {
+		int defer_timeout = i + 1 < main_opts.gatt_channels ? 1 : 0;
+
+		/* Attempt to connect using the Ext-Flowctl */
 		io = bt_io_connect(eatt_connect_cb, client, NULL, &gerr,
 					BT_IO_OPT_SOURCE_BDADDR,
 					btd_adapter_get_address(adapter),
@@ -2194,15 +2197,34 @@ static void eatt_connect(struct btd_gatt_client *client)
 					device_get_address(dev),
 					BT_IO_OPT_DEST_TYPE,
 					device_get_le_address_type(dev),
+					BT_IO_OPT_MODE, BT_IO_MODE_EXT_FLOWCTL,
 					BT_IO_OPT_PSM, BT_ATT_EATT_PSM,
 					BT_IO_OPT_SEC_LEVEL, BT_IO_SEC_LOW,
 					BT_IO_OPT_MTU, main_opts.gatt_mtu,
+					BT_IO_OPT_DEFER_TIMEOUT, defer_timeout,
 					BT_IO_OPT_INVALID);
 		if (!io) {
-			error("EATT bt_io_connect(%s): %s", addr,
-							gerr->message);
 			g_error_free(gerr);
-			return;
+			/* Fallback to legacy LE Mode */
+			io = bt_io_connect(eatt_connect_cb, client, NULL, &gerr,
+					BT_IO_OPT_SOURCE_BDADDR,
+					btd_adapter_get_address(adapter),
+					BT_IO_OPT_SOURCE_TYPE,
+					btd_adapter_get_address_type(adapter),
+					BT_IO_OPT_DEST_BDADDR,
+					device_get_address(dev),
+					BT_IO_OPT_DEST_TYPE,
+					device_get_le_address_type(dev),
+					BT_IO_OPT_PSM, BT_ATT_EATT_PSM,
+					BT_IO_OPT_SEC_LEVEL, BT_IO_SEC_LOW,
+					BT_IO_OPT_MTU, main_opts.gatt_mtu,
+					BT_IO_OPT_INVALID);
+			if (!io) {
+				error("EATT bt_io_connect(%s): %s", addr,
+							gerr->message);
+				g_error_free(gerr);
+				return;
+			}
 		}
 
 		g_io_channel_unref(io);
-- 
2.21.1