Uses userId parameter

Persistent userId

No random UUID per session

publishKey and subscribeKey present

No secretKey in client code

enableEventEngine option

Single PubNub instance

SSL/TLS not disabled

Listener before subscribe

Status event handling

Try-catch on publish

Alphabetical user ID sorting

Deterministic channel name

No invalid characters in channel name

Uses hyphens or underscores as separators

Descriptive channel prefix

Listener before subscribe

Message listener included

Status listener included

userId in SDK init

Async publish with error handling

Concise message payload

Dot-separated hierarchy

Maximum three levels

Wildcard at end only

Building-level wildcard subscribe

No invalid characters in base channel names

Async publish

Concise sensor payload

Payload under 32KB aware

Listener before subscribe

Status event handling

userId in SDK init

PubNub in useRef

useEffect for setup

Cleanup in useEffect return

unsubscribeAll on cleanup

removeListener on cleanup

Listener before subscribe

userId in PubNub config

Dependency array includes props

Valid channel name

Status listener

Try-catch on bid publish

Message listener handles bids

Uses Channel Groups

channelGroups.addChannels API

channelGroups.removeChannels API

Subscribe to channelGroups

Publishes to individual channel

fetchMessages for catch-up

Descriptive channel names

No invalid channel characters

userId in SDK init

Listener before subscribe

Status event handling

Error handling on publish or fetch