Noolite::sendCommand was implemented

src/noolite.h

@@ -2,6 +2,7 @@
 #define NOOLITE_H
 
 #include <vector>
+#include <optional>
 
 #include "interfaces/iusbdevice.h"
 
@@ -37,10 +38,12 @@ public:
     Noolite(IUsbDevice *device = nullptr);
     ~Noolite();
 
-    bool sendCommand(int channel, Command command, Params params = Params());
+    bool sendCommand(unsigned char channel, Command command, const Params &params = Params());
 
 private:
     IUsbDevice *m_device;
+
+    std::optional<Data> composeCommand(unsigned char channel, Command command, const Params &params) const;
 };
 
 }