And here's a patch that lets the user know the MTU size over DBus:
diff --git a/doc/gatt-api.txt b/doc/gatt-api.txt
index 2a8da75b0..a0db65383 100644
--- a/doc/gatt-api.txt
+++ b/doc/gatt-api.txt
@@ -68,6 +68,7 @@ Methods array{byte} ReadValue(dict options)
operation was successful.
Possible options: "offset": uint16 offset
+ "MTU": Exchanged MTU (Server only)
"device": Object Device (Server only)
Possible Errors: org.bluez.Error.Failed
@@ -83,6 +84,7 @@ Methods array{byte} ReadValue(dict options)
characteristic.
Possible options: "offset": Start offset
+ "MTU": Exchanged MTU (Server only)
"device": Device path (Server only)
"link": Link type (Server only)
"prepare-authorize": boolean Is prepare
diff --git a/src/gatt-database.c b/src/gatt-database.c
index 99c8ea231..c34da2d71 100644
--- a/src/gatt-database.c
+++ b/src/gatt-database.c
@@ -1932,7 +1932,9 @@ static void append_options(DBusMessageIter *iter, void *user_data)
{
struct pending_op *op = user_data;
const char *path = device_get_path(op->device);
+ struct bt_gatt_server *server;
const char *link;
+ uint16_t mtu;
switch (op->link_type) {
case BT_ATT_LINK_BREDR:
@@ -1955,6 +1957,11 @@ static void append_options(DBusMessageIter *iter, void *user_data)
if (op->prep_authorize)
dict_append_entry(iter, "prepare-authorize", DBUS_TYPE_BOOLEAN,
&op->prep_authorize);
+
+ server = btd_device_get_gatt_server(op->device);
+ mtu = bt_gatt_server_get_mtu(server);
+
+ dict_append_entry(iter, "MTU", DBUS_TYPE_UINT16, &mtu);
}
static void read_setup_cb(DBusMessageIter *iter, void *user_data)
@@ -2234,8 +2241,6 @@ static void acquire_write_setup(DBusMessageIter *iter, void *user_data)
{
struct pending_op *op = user_data;
DBusMessageIter dict;
- struct bt_gatt_server *server;
- uint16_t mtu;
dbus_message_iter_open_container(iter, DBUS_TYPE_ARRAY,
DBUS_DICT_ENTRY_BEGIN_CHAR_AS_STRING
@@ -2246,12 +2251,6 @@ static void acquire_write_setup(DBusMessageIter *iter, void *user_data)
append_options(&dict, op);
- server = btd_device_get_gatt_server(op->device);
-
- mtu = bt_gatt_server_get_mtu(server);
-
- dict_append_entry(&dict, "MTU", DBUS_TYPE_UINT16, &mtu);
-
dbus_message_iter_close_container(iter, &dict);
}
@@ -2320,8 +2319,6 @@ static void acquire_notify_setup(DBusMessageIter *iter, void *user_data)
{
DBusMessageIter dict;
struct pending_op *op = user_data;
- struct bt_gatt_server *server;
- uint16_t mtu;
dbus_message_iter_open_container(iter, DBUS_TYPE_ARRAY,
DBUS_DICT_ENTRY_BEGIN_CHAR_AS_STRING
@@ -2332,12 +2329,6 @@ static void acquire_notify_setup(DBusMessageIter *iter, void *user_data)
append_options(&dict, op);
- server = btd_device_get_gatt_server(op->device);
-
- mtu = bt_gatt_server_get_mtu(server);
-
- dict_append_entry(&dict, "MTU", DBUS_TYPE_UINT16, &mtu);
-
dbus_message_iter_close_container(iter, &dict);
}
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