Learn the MQTT protocol and emQTTD open source project emqtt.com/

The source version of EMQTTD is V1.1.3. Emqtt.com/downloads/1…

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The acl.config file defines the permissions to subscribe to the $SYS topic.

, {{allow user, "dashboard"}, subscribe, [" $SYS / # "]}. {allow, {ipaddr, "127.0.0.1"}, pubsub, [" $SYS / # ", "#"]}. {% % % deny, all, subscribe, ["$SYS/#", {eq, "#"}]}. {allow, all}.Copy the code

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2, open the vm. Args file and change the node name to:

# - name [email protected] - name [email protected]Copy the code

The third line of the acl.config file defaults to disallow clients from subscribing to the $SYS/# topic. Let’s comment it out. Start a client and subscribe to the $SYS/# theme with the following message:

See -module(emqttd_broker) for the source code. This module publishes messages every second with subject keys such as uptime and datetime.

-module(emqTTd_STATS) publishes Ets mqTT_STATS every 60 seconds.

Source see -module(emqttd_metrics) this module, it is the same principle. \

connected to 172.16.6.161:1883
subscribed $SYS/#
message recevied from $SYS/brokers: qos=0
[email protected]
message recevied from $SYS/brokers/[email protected]/sysdescr: qos=0
Erlang MQTT Broker
message recevied from $SYS/brokers/[email protected]/version: qos=0
1.1.3
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
29 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:24:01
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
30 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:24:02
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
31 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:24:03
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
32 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:24:04
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
33 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:24:05
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
34 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:24:06
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
35 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:24:07
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
36 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:24:08
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
37 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:24:09
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
38 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:24:10
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
39 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:24:11
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
40 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:24:12
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
41 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:24:13
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
42 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:24:14
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
43 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:24:15
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
44 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:24:16
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
45 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:24:17
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
46 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:24:18
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
47 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:24:19
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
48 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:24:20
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
49 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:24:21
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
50 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:24:22
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
51 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:24:23
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
52 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:24:24
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
53 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:24:25
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
54 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:24:26
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
55 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:24:27
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
56 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:24:28
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
57 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:24:29
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
58 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:24:30
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
59 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:24:31
message recevied from $SYS/brokers/[email protected]/stats/subscriptions/max: qos=0
1
message recevied from $SYS/brokers/[email protected]/stats/subscribers/max: qos=0
1
message recevied from $SYS/brokers/[email protected]/stats/topics/count: qos=0
53
message recevied from $SYS/brokers/[email protected]/stats/clients/count: qos=0
1
message recevied from $SYS/brokers/[email protected]/stats/subscriptions/count: qos=0
1
message recevied from $SYS/brokers/[email protected]/stats/topics/max: qos=0
53
message recevied from $SYS/brokers/[email protected]/stats/retained/count: qos=0
3
message recevied from $SYS/brokers/[email protected]/stats/routes/count: qos=0
1
message recevied from $SYS/brokers/[email protected]/stats/sessions/count: qos=0
0
message recevied from $SYS/brokers/[email protected]/stats/retained/max: qos=0
3
message recevied from $SYS/brokers/[email protected]/stats/sessions/max: qos=0
0
message recevied from $SYS/brokers/[email protected]/stats/routes/max: qos=0
1
message recevied from $SYS/brokers/[email protected]/stats/clients/max: qos=0
1
message recevied from $SYS/brokers/[email protected]/stats/subscribers/count: qos=0
1
message recevied from $SYS/brokers/[email protected]/metrics/bytes/received: qos=0
69
message recevied from $SYS/brokers/[email protected]/metrics/packets/pubrel/received: qos=0
0
message recevied from $SYS/brokers/[email protected]/metrics/packets/publish/received: qos=0
0
message recevied from $SYS/brokers/[email protected]/metrics/messages/qos1/received: qos=0
0
message recevied from $SYS/brokers/[email protected]/metrics/messages/qos1/sent: qos=0
0
message recevied from $SYS/brokers/[email protected]/metrics/packets/sent: qos=0
2
message recevied from $SYS/brokers/[email protected]/metrics/packets/pingresp: qos=0
0
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
1 minutes, 0 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:24:32
message recevied from $SYS/brokers/[email protected]/metrics/messages/qos2/received: qos=0
0
message recevied from $SYS/brokers/[email protected]/metrics/packets/disconnect: qos=0
0
message recevied from $SYS/brokers/[email protected]/metrics/messages/sent: qos=0
0
message recevied from $SYS/brokers/[email protected]/metrics/bytes/sent: qos=0
4249
message recevied from $SYS/brokers/[email protected]/metrics/messages/retained: qos=0
0
message recevied from $SYS/brokers/[email protected]/metrics/packets/pubcomp/sent: qos=0
0
message recevied from $SYS/brokers/[email protected]/metrics/packets/pubrec/received: qos=0
0
message recevied from $SYS/brokers/[email protected]/metrics/packets/pubcomp/received: qos=0
0
message recevied from $SYS/brokers/[email protected]/metrics/messages/dropped: qos=0
0
message recevied from $SYS/brokers/[email protected]/metrics/packets/received: qos=0
2
message recevied from $SYS/brokers: qos=0
[email protected]
message recevied from $SYS/brokers/[email protected]/version: qos=0
1.1.3
message recevied from $SYS/brokers/[email protected]/sysdescr: qos=0
Erlang MQTT Broker
message recevied from $SYS/brokers/[email protected]/metrics/packets/publish/sent: qos=0
0
message recevied from $SYS/brokers/[email protected]/metrics/packets/pingreq: qos=0
0
message recevied from $SYS/brokers/[email protected]/metrics/messages/qos0/sent: qos=0
0
message recevied from $SYS/brokers/[email protected]/metrics/packets/puback/sent: qos=0
0
message recevied from $SYS/brokers/[email protected]/metrics/packets/subscribe: qos=0
1
message recevied from $SYS/brokers/[email protected]/metrics/packets/suback: qos=0
1
message recevied from $SYS/brokers/[email protected]/metrics/packets/pubrel/sent: qos=0
0
message recevied from $SYS/brokers/[email protected]/metrics/packets/connect: qos=0
1
message recevied from $SYS/brokers/[email protected]/metrics/packets/connack: qos=0
1
message recevied from $SYS/brokers/[email protected]/metrics/packets/unsubscribe: qos=0
0
message recevied from $SYS/brokers/[email protected]/metrics/messages/received: qos=0
0
message recevied from $SYS/brokers/[email protected]/metrics/messages/qos2/sent: qos=0
0
message recevied from $SYS/brokers/[email protected]/metrics/packets/pubrec/sent: qos=0
0
message recevied from $SYS/brokers/[email protected]/metrics/packets/unsuback: qos=0
0
message recevied from $SYS/brokers/[email protected]/metrics/messages/qos0/received: qos=0
0
message recevied from $SYS/brokers/[email protected]/metrics/packets/puback/received: qos=0
0
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
1 minutes, 1 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:24:33
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
1 minutes, 2 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:24:34
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
1 minutes, 3 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:24:35
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
1 minutes, 4 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:24:36
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
1 minutes, 5 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:24:37
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
1 minutes, 6 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:24:38
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
1 minutes, 7 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:24:39
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
1 minutes, 8 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:24:40
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
1 minutes, 9 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:24:41
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
1 minutes, 10 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:24:42
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
1 minutes, 11 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:24:43
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
1 minutes, 12 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:24:44
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
1 minutes, 13 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:24:45
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
1 minutes, 14 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:24:46
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
1 minutes, 15 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:24:47
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
1 minutes, 16 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:24:48
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
1 minutes, 17 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:24:49
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
1 minutes, 18 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:24:50
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
1 minutes, 19 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:24:51
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
1 minutes, 20 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:24:52
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
1 minutes, 21 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:24:53
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
1 minutes, 22 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:24:54
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
1 minutes, 23 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:24:55
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
1 minutes, 24 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:24:56
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
1 minutes, 25 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:24:57
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
1 minutes, 26 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:24:58
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
1 minutes, 27 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:24:59
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
1 minutes, 28 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:25:00
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
1 minutes, 29 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:25:01
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
1 minutes, 30 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:25:02
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
1 minutes, 31 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:25:03
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
1 minutes, 32 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:25:04
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
1 minutes, 33 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:25:05
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
1 minutes, 34 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:25:06
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
1 minutes, 35 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:25:07
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
1 minutes, 36 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:25:08
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
1 minutes, 37 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:25:09
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
1 minutes, 38 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:25:10
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
1 minutes, 39 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:25:11
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
1 minutes, 40 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:25:12
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
1 minutes, 41 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:25:13
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
1 minutes, 42 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:25:14
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
1 minutes, 43 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:25:15
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
1 minutes, 44 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:25:16
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
1 minutes, 45 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:25:17
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
1 minutes, 46 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:25:18
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
1 minutes, 47 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:25:19
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
1 minutes, 48 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:25:20
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
1 minutes, 49 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:25:21
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
1 minutes, 50 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:25:22
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
1 minutes, 51 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:25:23
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
1 minutes, 52 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:25:24
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
1 minutes, 53 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:25:25
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
1 minutes, 54 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:25:26
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
1 minutes, 55 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:25:27
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
1 minutes, 56 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:25:28
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
1 minutes, 57 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:25:29
message recevied from $SYS/brokers/[email protected]/clients/861694030142478/connected: qos=0
{"clientid":"861694030142478","username":"invtGTerm","ipaddress":"172.16.6.155","session":false,"protocol":3,"connack":0,"ts":1512617129}
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
1 minutes, 58 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:25:30
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
1 minutes, 59 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:25:31
message recevied from $SYS/brokers/[email protected]/stats/subscriptions/max: qos=0
1
message recevied from $SYS/brokers/[email protected]/stats/subscribers/max: qos=0
1
message recevied from $SYS/brokers/[email protected]/stats/topics/count: qos=0
53
message recevied from $SYS/brokers/[email protected]/stats/clients/count: qos=0
2
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1
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53
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1
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3
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0
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1
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2
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1
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125
message recevied from $SYS/brokers/[email protected]/metrics/packets/pubrel/received: qos=0
0
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3
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0
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2 minutes, 0 seconds
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2017-12-07 11:25:32
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0
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0
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0
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15200
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3
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0
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0
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0
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0
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3
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[email protected]
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1.1.3
message recevied from $SYS/brokers/[email protected]/sysdescr: qos=0
Erlang MQTT Broker
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0
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0
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0
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1
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1
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0
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2
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2
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0
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0
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0
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0
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0
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0
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0
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2 minutes, 1 seconds
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2017-12-07 11:25:33
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2 minutes, 2 seconds
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2017-12-07 11:25:34
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2 minutes, 3 seconds
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2017-12-07 11:25:35
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2 minutes, 4 seconds
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2017-12-07 11:25:36
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2 minutes, 5 seconds
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2017-12-07 11:25:37
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2 minutes, 6 seconds
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2017-12-07 11:25:38
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2 minutes, 7 seconds
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2017-12-07 11:25:39
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2 minutes, 8 seconds
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2017-12-07 11:25:40
message recevied from $SYS/brokers/[email protected]/clients/861694030142478/disconnected: qos=0
{"clientid":"861694030142478","reason":"normal","ts":1512617141}
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2 minutes, 9 seconds
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2017-12-07 11:25:41
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2 minutes, 10 seconds
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2017-12-07 11:25:42
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2 minutes, 11 seconds
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2017-12-07 11:25:43
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2 minutes, 12 seconds
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2017-12-07 11:25:44
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2 minutes, 13 seconds
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2017-12-07 11:25:45
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2 minutes, 14 seconds
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2017-12-07 11:25:46
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2 minutes, 15 seconds
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2017-12-07 11:25:47
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2 minutes, 16 seconds
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2017-12-07 11:25:48
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2 minutes, 17 seconds
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2017-12-07 11:25:49
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2 minutes, 18 seconds
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2017-12-07 11:25:50
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2 minutes, 19 seconds
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2017-12-07 11:25:51
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2 minutes, 20 seconds
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2017-12-07 11:25:52
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2 minutes, 21 seconds
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2017-12-07 11:25:53
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2 minutes, 22 seconds
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2017-12-07 11:25:54
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2 minutes, 23 seconds
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2017-12-07 11:25:55
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2 minutes, 24 seconds
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2017-12-07 11:25:56
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2 minutes, 25 seconds
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2017-12-07 11:25:57
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2 minutes, 26 seconds
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2017-12-07 11:25:58
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2 minutes, 27 seconds
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2017-12-07 11:25:59
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2 minutes, 28 seconds
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2017-12-07 11:26:00
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2 minutes, 29 seconds
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2017-12-07 11:26:01
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2 minutes, 30 seconds
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2017-12-07 11:26:02
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2 minutes, 31 seconds
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2017-12-07 11:26:03
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2 minutes, 32 seconds
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2017-12-07 11:26:04
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2 minutes, 33 seconds
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2017-12-07 11:26:05
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2 minutes, 34 seconds
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2017-12-07 11:26:06
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2 minutes, 35 seconds
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2017-12-07 11:26:07
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
2 minutes, 36 seconds
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2017-12-07 11:26:08
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2 minutes, 37 seconds
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2017-12-07 11:26:09
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2 minutes, 38 seconds
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2017-12-07 11:26:10
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2 minutes, 39 seconds
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2017-12-07 11:26:11
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
2 minutes, 40 seconds
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2017-12-07 11:26:12
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2 minutes, 41 seconds
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2017-12-07 11:26:13
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2 minutes, 42 seconds
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2017-12-07 11:26:14
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2 minutes, 43 seconds
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2017-12-07 11:26:15
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2 minutes, 44 seconds
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2017-12-07 11:26:16
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2 minutes, 45 seconds
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2017-12-07 11:26:17
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2 minutes, 46 seconds
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2017-12-07 11:26:18
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2 minutes, 47 seconds
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2017-12-07 11:26:19
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
2 minutes, 48 seconds
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2017-12-07 11:26:20
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2 minutes, 49 seconds
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2017-12-07 11:26:21
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2 minutes, 50 seconds
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2017-12-07 11:26:22
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2 minutes, 51 seconds
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2017-12-07 11:26:23
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2 minutes, 52 seconds
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2017-12-07 11:26:24
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2 minutes, 53 seconds
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2017-12-07 11:26:25
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2 minutes, 54 seconds
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2017-12-07 11:26:26
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2 minutes, 55 seconds
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2017-12-07 11:26:27
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2 minutes, 56 seconds
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2017-12-07 11:26:28
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2 minutes, 57 seconds
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2017-12-07 11:26:29
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2 minutes, 58 seconds
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2017-12-07 11:26:30
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
2 minutes, 59 seconds
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2017-12-07 11:26:31
message recevied from $SYS/brokers/[email protected]/stats/subscriptions/max: qos=0
1
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1
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53
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1
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1
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53
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3
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1
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0
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3
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0
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1
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2
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1
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127
message recevied from $SYS/brokers/[email protected]/metrics/packets/pubrel/received: qos=0
0
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0
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0
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0
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3
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0
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3 minutes, 0 seconds
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2017-12-07 11:26:32
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0
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1
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0
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26419
message recevied from $SYS/brokers/[email protected]/metrics/messages/retained: qos=0
3
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0
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0
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0
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0
message recevied from $SYS/brokers/[email protected]/metrics/packets/received: qos=0
4
message recevied from $SYS/brokers: qos=0
[email protected]
message recevied from $SYS/brokers/[email protected]/version: qos=0
1.1.3
message recevied from $SYS/brokers/[email protected]/sysdescr: qos=0
Erlang MQTT Broker
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0
message recevied from $SYS/brokers/[email protected]/metrics/packets/pingreq: qos=0
0
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0
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0
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1
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1
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0
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2
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2
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0
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0
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0
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0
message recevied from $SYS/brokers/[email protected]/metrics/packets/unsuback: qos=0
0
message recevied from $SYS/brokers/[email protected]/metrics/messages/qos0/received: qos=0
0
message recevied from $SYS/brokers/[email protected]/metrics/packets/puback/received: qos=0
0
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3 minutes, 1 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:26:33
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
3 minutes, 2 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:26:34
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
3 minutes, 3 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:26:35
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
3 minutes, 4 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:26:36
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
3 minutes, 5 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:26:37
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
3 minutes, 6 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:26:38
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
3 minutes, 7 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:26:39
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
3 minutes, 8 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:26:40
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
3 minutes, 9 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:26:41
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
3 minutes, 10 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:26:42
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
3 minutes, 11 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:26:43
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
3 minutes, 12 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:26:44
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
3 minutes, 13 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:26:45
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
3 minutes, 14 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:26:46
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
3 minutes, 15 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:26:47
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
3 minutes, 16 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:26:48
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
3 minutes, 17 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:26:49
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
3 minutes, 18 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:26:50
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
3 minutes, 19 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:26:51
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
3 minutes, 20 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:26:52
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
3 minutes, 21 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:26:53
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
3 minutes, 22 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:26:54
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
3 minutes, 23 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:26:55
message recevied from $SYS/brokers/[email protected]/uptime: qos=0
3 minutes, 24 seconds
message recevied from $SYS/brokers/[email protected]/datetime: qos=0
2017-12-07 11:26:56
unsubscribed $SYS/#
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3, subscribe to the client offline topic, see the source code of -module(emqttd_mod_presence).

The source code mentions a clientId mode theme for a specific node is:

$SYS/brokers/(node)/clients / $SYS/brokers (clientId)/connected/[email protected] / clients / 861694030142478 / connected $SYS/brokers/[email protected] / clients / 861694030142478 / disconnected I after finishing, is the theme of the wildcard way: $SYS/brokers/+/clients/+/connected $SYS/brokers/+/clients/+/disconnected $SYS/brokers/+/clients/#\

The actual offline message of the subscription client is as follows:

Connected to 172.16.6.161:1883 $SYS/brokers/+/clients/# message recevied from $SYS/brokers/[email protected] / clients / 861694030142478 / connected: qos=0 {" clientid ":" 861694030142478 ", "username" : "invtGTerm", "ipaddress" : "172.16.6.155", "session" : false, "protocol" : 3, "connack" : 0 , "ts" : 1512629239} message recevied the from $SYS/brokers/[email protected] / clients / 861694030142478 / disconnected: qos=0 {"clientid":"861694030142478","reason":"normal","ts":1512629242}Copy the code

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So, to be safe, let’s change the acl.config file to:

Allows clients to subscribe to the “$SYS/brokers/+/clients/#” theme, but disallows subscribing to the “$SYS/#” theme.

, {{allow user, "dashboard"}, subscribe, [" $SYS / # "]}. {allow, {ipaddr, "127.0.0.1"}, pubsub, [" $SYS / # ", "#"]}. {allow, all, subscribe, ["$SYS/brokers/+/clients/#"]}. {deny, all, subscribe, ["$SYS/#", {eq, "#"}]}. {allow, all}.Copy the code




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