Print version number of device 1 on each raw dev.

Only works on HID++ >=2.0 so far. Also solves a race condition where
the wrong response can be sent to a request.

src/logid/backend/hidpp20/Device.h

@@ -0,0 +1,19 @@
+#ifndef LOGID_HIDPP20_DEVICE_H
+#define LOGID_HIDPP20_DEVICE_H
+
+#include "../hidpp/Device.h"
+#include <cstdint>
+
+namespace logid {
+namespace backend {
+namespace hidpp20 {
+    class Device : public hidpp::Device
+    {
+    public:
+        std::vector<uint8_t> callFunction(uint8_t feature_index,
+                uint8_t function,
+                std::vector<uint8_t>& params);
+    };
+}}}
+
+#endif //LOGID_HIDPP20_DEVICE_H