
이유는 간단하다
Once the client enters the subscribed state it is not supposed to issue any other commands, except for additional
SUBSCRIBE,SSUBSCRIBE,PSUBSCRIBE,UNSUBSCRIBE,SUNSUBSCRIBE,PUNSUBSCRIBE,PING,RESETandQUITcommands. However, if RESP3 is used (seeHELLO) it is possible for a client to issue any commands while in subscribed state.