introduce dispatch method to simplify things

src/Sprocket.cpp

@@ -22,6 +22,7 @@ Sprocket* Sprocket::activate() {
 Sprocket* Sprocket::join(Network& net){
     Serial.println("join network");
     net.init(&scheduler);
+    net.onReceive(bind(&Sprocket::dispatch,this, _1, _2));
     net.connect();
     return activate(&scheduler, &net);
 }