Settting per_listener_settings to true prevents LWT to be published

[datafoo]

Consider these 2 simple configuration files:

mosquitto-1.conf:

per_listener_settings false
listener 1883
allow_anonymous true

mosquitto-2.conf:

per_listener_settings true
listener 1883
allow_anonymous true

I ran the same test with each of the 2 configuration files:

C:\Program Files\Mosquitto>mosquitto.exe -v -c mosquitto-1.conf
1633076034: mosquitto version 2.0.12 starting
1633076034: Config loaded from mosquitto-1.conf.
1633076034: Opening ipv6 listen socket on port 1883.
1633076034: Opening ipv4 listen socket on port 1883.
1633076034: mosquitto version 2.0.12 running
1633076036: New connection from 127.0.0.1:60376 on port 1883.
1633076036: New client connected from 127.0.0.1:60376 as mqtt-explorer-b4a4d88b (p2, c1, k60).
1633076036: No will message specified.
1633076036: Sending CONNACK to mqtt-explorer-b4a4d88b (0, 0)
1633076036: Received SUBSCRIBE from mqtt-explorer-b4a4d88b
1633076036:     # (QoS 0)
1633076036: mqtt-explorer-b4a4d88b 0 #
1633076036: Sending SUBACK to mqtt-explorer-b4a4d88b
1633076045: New connection from 10.177.26.40:60401 on port 1883.
1633076045: New client connected from 10.177.26.40:60401 as MQTT_FX_Client (p2, c1, k5, u'admin').
1633076045: Will message specified (7 bytes) (r1, q0).
1633076045:     STATE/MQTT_FX_Client
1633076045: Sending CONNACK to MQTT_FX_Client (0, 0)
1633076048: Client MQTT_FX_Client closed its connection.
1633076048: Sending PUBLISH to mqtt-explorer-b4a4d88b (d0, q0, r0, m0, 'STATE/MQTT_FX_Client', ... (7 bytes))
1633076053: Received DISCONNECT from mqtt-explorer-b4a4d88b
1633076053: Client mqtt-explorer-b4a4d88b disconnected.
1633076055: mosquitto version 2.0.12 terminating

Note the line Sending PUBLISH to mqtt-explorer-b4a4d88b (d0, q0, r0, m0, 'STATE/MQTT_FX_Client', ... (7 bytes))in this first test.

C:\Program Files\Mosquitto>mosquitto.exe -v -c mosquitto-2.conf
1633076059: mosquitto version 2.0.12 starting
1633076059: Config loaded from mosquitto-2.conf.
1633076059: Opening ipv6 listen socket on port 1883.
1633076059: Opening ipv4 listen socket on port 1883.
1633076059: mosquitto version 2.0.12 running
1633076061: New connection from 127.0.0.1:60402 on port 1883.
1633076061: New client connected from 127.0.0.1:60402 as mqtt-explorer-b4a4d88b (p2, c1, k60).
1633076061: No will message specified.
1633076061: Sending CONNACK to mqtt-explorer-b4a4d88b (0, 0)
1633076061: Received SUBSCRIBE from mqtt-explorer-b4a4d88b
1633076061:     # (QoS 0)
1633076061: mqtt-explorer-b4a4d88b 0 #
1633076061: Sending SUBACK to mqtt-explorer-b4a4d88b
1633076072: New connection from 10.177.26.40:60409 on port 1883.
1633076072: New client connected from 10.177.26.40:60409 as MQTT_FX_Client (p2, c1, k5, u'admin').
1633076072: Will message specified (7 bytes) (r1, q0).
1633076072:     STATE/MQTT_FX_Client
1633076072: Sending CONNACK to MQTT_FX_Client (0, 0)
1633076077: Client MQTT_FX_Client closed its connection.
1633076080: Received DISCONNECT from mqtt-explorer-b4a4d88b
1633076080: Client mqtt-explorer-b4a4d88b disconnected.
1633076082: mosquitto version 2.0.12 terminating

Note the lack of the LWT message in the logs. The LWT from client MQTT_FX_Client was not published in this test where per_listener_settings true.

My environment:

• mosquitto version 2.0.12
• Windows 10 Pro 21H1

[Elix-g]

This issue has been recognized and the fixes branch already contains the resolution for this problem. Fix will be rolled out with release of version 2.0.13.

BR,
Elix

[Elix-g]

For your reference:

https://github.com/eclipse/mosquitto/issues/2314

[datafoo]

Correct link is #2314