I need to check if the client is connected before sending the push message.

[kimhyoh]

emqx-4.4.10

I need to check if the client is connected before sending the push message.

So I subscribed to a system topic to synchronize the information to Redis whenever a connect/disconnect event occurs.

• $queue/$SYS/brokers/+/clients/+/#

However, there is a discrepancy between the number of clients actually connected to web admin and the number of clients registered in Redis.

emq web admin : about 270,000
redis : about 240,000

Is there any other way to check the exact connection status of the user before sending the message?

[kimhyoh]

I checked the application logs.

It seems to be the same issue as the one below.

ClientState: C5180518000011: Timed out as no activity, keepAlive=60,000 lastOutboundActivity=1,534,923,567,979 lastInboundActivity=1,534,923,507,945 time=1,534,923,627,951 lastPing=1,534,923,567,979

Does anyone have experience resolving this?

[william]

Does you subscriber online all the time?
maybe the messages are lost during the connect/reconnect.
does it reconnect with clean session = True?