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ioolkos avatar ioolkos commented on June 6, 2024

@mths1 We would want it to disconnect in both cases but mosquitto is a re-connecting client.

Can you add the debug option (-d) to mosquitto_sub` to see the different behaviour?

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mths1 avatar mths1 commented on June 6, 2024

On one hand, it seems I am really observing some implementation detail of mosquitto sub, on the other hand VerneMQ closes the session differently with (-c and without):

vmq-admin session disconnect client-id=test1

mosquitto_sub -t test -d -i test1 -V 5
Client test1 sending CONNECT
Client test1 received CONNACK (0)
Client test1 sending SUBSCRIBE (Mid: 1, Topic: test, QoS: 0, Options: 0x00)
Client test1 received SUBACK
Subscribed (mid: 1): 0
Received DISCONNECT (152)

vmq-admin session disconnect client-id=test1 -c

mosquitto_sub -t test -d -i test1 -V 5
Client test1 sending CONNECT
Client test1 received CONNACK (0)
Client test1 sending SUBSCRIBE (Mid: 1, Topic: test, QoS: 0, Options: 0x00)
Client test1 received SUBACK
Subscribed (mid: 1): 0
Client test1 sending CONNECT
Client test1 received CONNACK (0)
Client test1 sending SUBSCRIBE (Mid: 2, Topic: test, QoS: 0, Options: 0x00)
Client test1 received SUBACK
Subscribed (mid: 2): 0

MQTTv3 always reconnects

Client test1 sending CONNECT
Client test1 received CONNACK (0)
Client test1 sending SUBSCRIBE (Mid: 1, Topic: test, QoS: 0, Options: 0x00)
Client test1 received SUBACK
Subscribed (mid: 1): 0
Client test1 sending CONNECT
Client test1 received CONNACK (0)
Client test1 sending SUBSCRIBE (Mid: 2, Topic: test, QoS: 0, Options: 0x00)
Client test1 received SUBACK
Subscribed (mid: 2): 0

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ioolkos avatar ioolkos commented on June 6, 2024

Thanks, so it's about whether the DISCONNECT is received or not.
We can check if it's the network or the implementation.

Can you add something like the following options to vernemq.conf: (the point is to set the linger option to something other than 0):

tcp_listen_options = [{nodelay, true}, {linger, {true, 6}}, {send_timeout, 30000}, {send_timeout_close, true}]

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mths1 avatar mths1 commented on June 6, 2024

I close this, as it is an implementation detail of mosquitto. The tcl_listen_options did not change the behaviour.

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