GATT Exchange MTU is a procedure defined by the Generic Attribute
Profile, it is not related to the remote GATT primary service. However,
gatt plugin is the most suitable place to manage this procedure.
---
profiles/gatt/gas.c | 36 ++++++++++++++++++++++++++++++++++++
1 files changed, 36 insertions(+), 0 deletions(-)
diff --git a/profiles/gatt/gas.c b/profiles/gatt/gas.c
index de23a13..61e6745 100644
--- a/profiles/gatt/gas.c
+++ b/profiles/gatt/gas.c
@@ -32,6 +32,7 @@
#include "att.h"
#include "gattrib.h"
#include "attio.h"
+#include "btio.h"
#include "gatt.h"
#include "log.h"
#include "gas.h"
@@ -46,6 +47,7 @@ struct gas {
guint attioid;
guint changed_ind;
uint16_t changed_handle;
+ uint16_t mtu;
};
static GSList *devices = NULL;
@@ -250,12 +252,46 @@ static void gatt_characteristic_cb(GSList *characteristics, guint8 status,
gatt_find_info(gas->attrib, start, end, gatt_descriptors_cb, gas);
}
+static void exchange_mtu_cb(guint8 status, const guint8 *pdu, guint16 plen,
+ gpointer user_data)
+{
+ struct gas *gas = user_data;
+ uint16_t rmtu;
+
+ if (status) {
+ error("MTU exchange: %s", att_ecode2str(status));
+ return;
+ }
+
+ if (!dec_mtu_resp(pdu, plen, &rmtu)) {
+ error("MTU exchange: protocol error");
+ return;
+ }
+
+ gas->mtu = MIN(rmtu, gas->mtu);
+ if (g_attrib_set_mtu(gas->attrib, gas->mtu))
+ DBG("MTU exchange succeeded: %d", gas->mtu);
+ else
+ DBG("MTU exchange failed");
+}
+
static void attio_connected_cb(GAttrib *attrib, gpointer user_data)
{
struct gas *gas = user_data;
+ GIOChannel *io;
+ GError *gerr = NULL;
+ uint16_t cid, imtu;
uint16_t app;
gas->attrib = g_attrib_ref(attrib);
+ io = g_attrib_get_channel(attrib);
+
+ if (bt_io_get(io, BT_IO_L2CAP, &gerr, BT_IO_OPT_IMTU, &imtu,
+ BT_IO_OPT_CID, &cid, BT_IO_OPT_INVALID)) {
+ gatt_exchange_mtu(gas->attrib, imtu, exchange_mtu_cb, gas);
+ gas->mtu = imtu;
+ DBG("MTU Exchange: Requesting %d", imtu);
+ }
gas->changed_ind = g_attrib_register(gas->attrib, ATT_OP_HANDLE_IND,
indication_cb, gas, NULL);
--
1.7.8.6
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