Extensions: Offer an opportunity to communicate with a dead device

include/icsneo/device/device.h

@@ -283,6 +283,8 @@ private:
 	std::vector<Network> supportedTXNetworks;
 	std::vector<Network> supportedRXNetworks;
 	
+	APIEvent::Type attemptToBeginCommunication();
+
 	// Use heartbeatSuppressed instead when reading
 	std::atomic<int> heartbeatSuppressedByUser{0};
 	bool heartbeatSuppressed() const { return heartbeatSuppressedByUser > 0 || (settings && settings->applyingSettings); }

include/icsneo/device/extensions/deviceextension.h

@@ -17,7 +17,12 @@ public:
 	virtual ~DeviceExtension() = default;
 	virtual const char* getName() const = 0;
 
-	virtual void onDeviceOpen() {}
+	// Return false to block opening
+	virtual bool onDeviceOpen() { return true; }
+
+	// Return true to indicate that communication should now be back
+	virtual bool onDeviceCommunicationDead() { return false; }
+
 	virtual void onGoOnline() {}
 	virtual void onGoOffline() {}
 	virtual void onDeviceClose() {}