Zabbix 7.0 Agent2 MQTT TLS Plugin Problam

[jeffmandel]

The Zabbix MQTT TLS configuration process keeps failing. I don't know why.
Version list
Ubuntu 24.04.2 LTS
Zabbix Agent 2 7.0.17
Zabbix Agent 2 has been running for a long time, and the general snmp data collection is normal.

MQTTS Status Description:
1. The MQTT broker is functioning properly. TCP/Firewall is configured correctly.

Receiver side
sudo -u mosquitto mosquitto_sub -h 192.168.2.71 -p 8883 --cafile ~/ca.crt -u zabbix_user -P passwd123 -t "test/topic" -v

Sending Side
sudo -u mosquitto mosquitto_pub -h 192.168.2.71 -p 8883 --cafile /etc/mosquitto/certs/ca.crt -u zabbix_user -P passwd123 -t "test/topic" -m "Hello, Zabbix!"

Can be received at the receiving message.
Client null received PUBLISH (d0, q0, r0, m0, 'test/topic', ... (14 bytes))
test/topic Hello, Zabbix!

2. /etc/zabbix/zabbix_agent2.conf add the following
Plugins.MQTT.Sessions.MQTTsBroker.Url=tls://192.168.2.71:8883
Plugins.MQTT.Sessions.MQTTsBroker.Topic=test/topic
Plugins.MQTT.Sessions.MQTTsBroker.TLSCAFile=/etc/zabbix/ca.crt
Plugins.MQTT.Sessions.MQTTsBroker.User=zabbix_user
Plugins.MQTT.Sessions.MQTTsBroker.Password=passwd1 23

3. Permissions
sudo ls -l /etc/zabbix/ca.crt
-rw-r--r-- 1 zabbix zabbix 1432 Jul 28 18:50 /etc/zabbix/ca.crt

4. Zabbix Web adds item 1
Name：MQTT Test Topic
Type：Zabbix agent (active)
Key：mqtt.get["tls://192.168.2.71:8883,test/topic,zabbix_user,iotddcom"]
Type of information：Text

log error , /var/log/zabbix/zabbix_server.log
Invalid first parameter "URL": parse "tls://192.168.2.71:8883,test/topic,zabbix_user,iotddcom": invalid port ":8883,test" after host.

5. Zabbix Web modify key
Name：MQTT Test Topic
Type：Zabbix agent (active)
Key：mqtt.get[MQTTsBroker]
Type of information：Text

log error , /var/log/zabbix/zabbix_server.log
sudo tail -f /var/log/zabbix/zabbix_server.log | grep mqtt
2246:20250728:204500.002 In substitute_key_macros_impl() data:'mqtt.get[MQTTsBroker]'
2246:20250728:204500.002 End of substitute_key_macros_impl():SUCCEED data:'mqtt.get[MQTTsBroker]'
2246:20250728:204500.003 send_list_of_active_checks_json() sending [{"response":"success","config_revision":470,"da ta" :[{"key":"mqtt.get[MQTTsBroker]","itemid":49191,"delay":"0","lastlogsize":0," mtim e":0,"timeout":"3s"}]}]
2246:20250728:204505.005 hostid:10658 item mqtt.get[MQTTsBroker] error: open : no such file or directory

6. Is the zabbix setting#4 and #5 correct?
7. #5 Which file does "no such file or directory" refer to?

Thanks.

[Markku]

For number 4 (":8883,test" error), I'd suggest quoting the URL (you have incorrectly quoted everything as one parameter): https://www.zabbix.com/documentation...-quoted-string

For number 5 (session name), in https://www.zabbix.com/documentation...gent2#mqtt.get there is no "connString" parameter mentioned, so I take it that the MQTT plugin cannot use session name (some other plugins specifically mention "connString = URI or session name", MQTT only says "broker URL").

Markku

[Markku]

For number 4 (":8883,test" error), I'd suggest quoting the URL (you have incorrectly quoted everything as one parameter): https://www.zabbix.com/documentation...-quoted-string

For number 5 (session name), in https://www.zabbix.com/documentation...gent2#mqtt.get there is no "connString" parameter mentioned, so I take it that the MQTT plugin cannot use session name (some other plugins specifically mention "connString = URI or session name", MQTT only says "broker URL").

Markku

[Brambo]

Is it a typo in your zabbix conf section where the password has a space between 1 and 2?

[jeffmandel]

Change the key format to the following: mqtt.get["tls://192.168.2.71:8883","test/topic","zabbix_user","passwd123"]
The system will then accept it.

Thanks, Markku, for the heads-up.

[cyber]

Is it a typo in your zabbix conf section where the password has a space between 1 and 2?

Its the forum "feature" to add random spaces in pasted text..