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https://issues.apache.org/jira/browse/AMQ-6639?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15947153#comment-15947153
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Aland Valdor commented on AMQ-6639:
-----------------------------------
Hello,
We cannot give a TU because we noticed the issue with a mobile phone that lose
the network. it is hard for us to simulate that event.
But I can give you the steps to reproduce it with some piece of code.
Step 1) use a tool P(ex mosquitto_sub) listening the topic X.
Step 2) connect your mobile to the MQTT server. Mobile send a retain message
to the topic X
Step 3) MQTT server push the retain message to the tool P.
Step 4) Activate "AirPlane" mode on the mobile
Step 5) 10 seconds after, unactivate "AirPlane" mode. A retain message must be
send again to topic X.
Step 6) MQTT server push the retain message to the tool P.
Step 7) wait for 2 minutes. MQTT push a LWT to tool P
This is an example the code used on our mobile application to send message to
MQTT server
{code:javascript}
var i_am_connected = new Paho.MQTT.Message(JSON.stringify({
version: 1,
state: 2,
timestamp: startListeningTimeInS,
deverylight: Version,
os: ionic.Platform.platform(),
release: ionic.Platform.version()
}));
i_am_connected.destinationName = "device/" + LoginService.userData.token
+ "/ping";
i_am_connected.retained = true;
i_am_connected.qos = 1;
var i_am_connected = new Paho.MQTT.Message(JSON.stringify({
version: 1,
state: 2,
timestamp: startListeningTimeInS,
deverylight: Version,
os: ionic.Platform.platform(),
release: ionic.Platform.version()
}));
i_am_connected.destinationName = "device/" + LoginService.userData.token
+ "/ping";
i_am_connected.retained = true;
i_am_connected.qos = 1;
client.connect({
timeout: 3,
useSSL: false,
cleanSession: true,
userName: LoginService.userData.token,
password: '',
willMessage: i_am_disconnected,
onSuccess: function() {
timeOfConnectionLoss = 0;
service.connected = 2;
client.send(i_am_connected);
//resubscribing
Object.keys(subscriptions).forEach(function (topic) {
client.subscribe(topic);
});
window.addEventListener('unload', disconnect);
deferred.resolve();
},
onFailure: onConnectionLost
});
{code}
> MQTT : "Lost Connection" LWT message are not cancelled after network come back
> ------------------------------------------------------------------------------
>
> Key: AMQ-6639
> URL: https://issues.apache.org/jira/browse/AMQ-6639
> Project: ActiveMQ
> Issue Type: Bug
> Components: MQTT
> Affects Versions: 5.13.3
> Environment: linux.
> Application android and ios
> Reporter: Aland Valdor
>
> Hello,
> We have an issue with the MQTT ActiveMQ.
> This is our situation:
> Our mobile applications are connected to our ActiveMQ MQTT server.
> We use the LWT message to detect the mobile "network lost".
> We noticed that when we got a mobile "network lost", the LWT message is sent
> 90s after the disconnect. If the network comes back before 90s, a retained
> message is sent to alert the server. But we saw that the "network lost" LWT
> message is STILL sent even if we received the retained message.
> For me, the LWT message "network lost" should be cancelled if we received a
> new retained message.
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