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fix(win): maintain the GATT session to stabilize MTU negotiation #88

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fix(win): maintain the GATT session to stabilize MTU negotiation #88

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10 changes: 10 additions & 0 deletions lib/win/src/ble_manager.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -362,6 +362,16 @@ void BLEManager::OnGattSessionCreated(IAsyncOperation<GattSession> asyncOp, Asyn
peripheral.gattSession = session;
auto token = session.MaxPduSizeChanged(onPduSizeChanged);
peripheral.maxPduSizeChangedToken = token;

// Proactively maintain the GATT session so Windows establishes the
// physical connection up front. FromBluetoothAddressAsync returns
// before the link is up; without this the first GATT operation
// triggers the connection while the MTU is still the default 23,
// racing the peripheral's MTU exchange during service discovery.
// MaintainConnection defaults to false; the session is released in
// PeripheralWinrt::Disconnect(), so this does not keep the link open
// after an intentional disconnect.
session.MaintainConnection(true);
}
else
{
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