code: public void readScratchData(ScratchBank bank, Callback<ScratchData> callback) {
          addCallback(BeanMessageID.BT_GET_SCRATCH, callback);
          Buffer buffer = new Buffer();
          buffer.writeByte(intToByte(bank.getRawValue()));
          sendMessage(BeanMessageID.BT_GET_SCRATCH, buffer);
      }
docs: Request a scratch bank data value.
  
  @param bank     the {@link com.punchthrough.bean.sdk.message.ScratchBank} for which data is
  being requested
  @param callback the callback for the result