Support building fetch position packets

src/main.cpp

@@ -173,7 +173,7 @@ void onConnectionEstablished() {
   client.subscribe("hotdog/test_mqtt_blind/set_position", [] (const String &payload)  {
     uint16_t shadeID = 0x4EF1;
     float percentage = payload.toInt() / 100.0f;
-    hubPacketBuilder.buildPositionPacket(buffer, shadeID, percentage);
+    hubPacketBuilder.buildSetPositionPacket(buffer, shadeID, percentage);
     sendCommand(buffer);
   });