code: private void addPostParams(final Request request) {
          if (command != null) {
              request.addPostParam("Command", command);
          }
  
          if (device != null) {
              request.addPostParam("Device", device);
          }
  
          if (sim != null) {
              request.addPostParam("Sim", sim);
          }
  
          if (callbackMethod != null) {
              request.addPostParam("CallbackMethod", callbackMethod);
          }
  
          if (callbackUrl != null) {
              request.addPostParam("CallbackUrl", callbackUrl.toString());
          }
  
          if (commandMode != null) {
              request.addPostParam("CommandMode", commandMode);
          }
  
          if (includeSid != null) {
              request.addPostParam("IncludeSid", includeSid);
          }
      }
docs: Add the requested post parameters to the Request.
  
  @param request Request to add post params to