code: @ObjectiveCName("addReactionWithPeer:withRid:withCode:")
      public Command<Void> addReaction(Peer peer, long rid, String code) {
          return callback -> modules.getMessagesModule().addReaction(peer, rid, code)
                  .then(v -> callback.onResult(v))
                  .failure(e -> callback.onError(e));
      }
docs: Adding reaction to a message
  
  @param peer destination peer
  @param rid  random id of message
  @param code reaction code
  @return Command for execution