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Mastering Redis by Jeremy Nelson

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Pub/Sub RESP replies

In Redis Pub/Sub, the messaging format is in RESP Array reply with three or four elements. The first element in the Pub/Sub messaging format determines the type of message and can be one of these four Redis commands, SUBSCRIBE, UNSCRIBE, PSUBSCRIBE, and PUNSUBSCRIBE.

SUBSCRIBE and UNSUBSCRIBE RESP Arrays

Connecting to a Redis instance with two connections, the first with a standard Redis CLI client and the second with telnet, we will illustrate the RESP reply for three element commands SUBSCRIBE and UNSUBSCRIBE:

$ telnet localhost 6379
Trying ::1...
Connected to localhost.
Escape character is '^]'.
SUBSCRIBE info
*3
$9
subscribe
$4
info
:1

In this SUBSCRIBE command, the first element is $9 followed by carriage-return line feed. ...

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