Device: Make IO system thread-safe

include/icsneo/device/tree/valuecan4/valuecan4-2el.h

@@ -58,6 +58,7 @@ protected:
 	void handleDeviceStatus(const std::shared_ptr<Message>& message) override {
 		if(!message || message->data.size() < sizeof(valuecan4_2el_status_t))
 			return;
+		std::lock_guard<std::mutex> lk(ioMutex);
 		const valuecan4_2el_status_t* status = reinterpret_cast<const valuecan4_2el_status_t*>(message->data.data());
 		ethActivationStatus = status->ethernetActivationLineEnabled;
 	}