windows/serialInterface: Added a call to read out the serial state no…

…tification when we start comms

src/windows/serialInterface.cxx

@@ -202,6 +202,10 @@ serialInterface_t::serialInterface_t(const usbDevice_t &usbDevice) : device
 	timeouts.WriteTotalTimeoutMultiplier = 10;
 	if (!SetCommTimeouts(device, &timeouts))
 		handleDeviceError("set communications timeouts for device"sv);
+
+	// Having adjusted the line state, try to do a read of the serial state notification which will be sat in the buffer
+	std::array<uint8_t, 10U> serialState{};
+	static_cast<void>(ReadFile(device, serialState.data(), serialState.size(), nullptr, nullptr));
 }
 
 serialInterface_t::~serialInterface_t() noexcept