Hello,
I installed openhab 3 and in openhab-config I installed Mqtt without of problems.
Now I try to into OH to add the mqtt-broker via mqtt-binding. But can’t get it online. Everytime he shows communication error.
What’s the right way to do?
Thank you
your code goes here
What MQTT broker are you using? Mosquitto? Can you show us that it is actually running?
Thank you for your reply. Now I startet a fresh OH3 installation and now its´s working fine. Last time I booting OH3 from a USB SSD - do you know if that could be the problem.
Is it nessesary to use SSD at OH3, because of the SD crash?
Changing to OH3 shouldn’t matter - risks are still the same as they ever where. I guess the only difference is that OH3 has persistence on by default, so it is probably going to write more to your SD card.
There are quite a few people here who run from an SSD - I’m fairly certain our resident Australian @denominator does, and he uses MQTT.
Another option might be to use openHABian, which will use ZRAM to reduce SD card fatigue.
Most importantly though: use a good quality SD card, and a good quality power supply, and make sure not to just remove power from the Pi - always shut down first.
Ok, thanks.
Now, the problem is back: After changing the Network to wlan and do a reboot, the MQTT isn´t running anylonger 
I´m using openhabian, but when I try to use ZRAM via config, it shows the error
Which bit? The MQTT broker? The Bridge Thing? The device (Generic) Things?
If you want to use ZRAM then follow those instructions on your screen to read the DEBUG guide, which will give you more instructions!
The MQTT Broker isn´t working - the bridge thing shows communication error in red and when I try to connect via MQTT.fx it shows "unable to connect to server.
The DEBUG guide didn´t help me so much
What do you get when you run sudo /bin/systemctl status mosquitto.service
Also can you post the mosquitto.log file sudo cat /var/log/mosquitto/mosquitto.log
Rpi 3b+ Msata SSD openHAB 2 latest main system for now but moving everything to a new home. Rpi 4 8 gig ram running 64bit os openHAB 3 on SD card
MQTT is your friend and the centre of my control system for heaps of things.
**[13:07:27]** **openhabian@openHABianDevice**:**~**$ sudo /bin/systemctl status mosquitto.service
[sudo] password for openhabian:
**Warning:** The unit file, source configuration file or drop-ins of mosquitto.service changed on disk. Run 'systemctl daemon-reload' to reload units.
**●** mosquitto.service - Mosquitto MQTT v3.1/v3.1.1 Broker
Loaded: loaded (/lib/systemd/system/mosquitto.service; enabled; vendor preset: enabled)
Drop-In: /etc/systemd/system/mosquitto.service.d
└─override.conf
Active: **failed** (Result: exit-code) since Sat 2020-12-26 12:49:49 CET; 17min ago
Docs: man:mosquitto.conf(5)
man:mosquitto(8)
Process: 867 ExecStart=/usr/sbin/mosquitto -c /etc/mosquitto/mosquitto.conf **(code=exited, status=1/FAILURE)**
Main PID: 867 (code=exited, status=1/FAILURE)
Dec 26 12:49:49 openHABianDevice systemd[1]: mosquitto.service: Service RestartSec=100ms expired, scheduling restart.
Dec 26 12:49:49 openHABianDevice systemd[1]: mosquitto.service: Scheduled restart job, restart counter is at 5.
Dec 26 12:49:49 openHABianDevice systemd[1]: Stopped Mosquitto MQTT v3.1/v3.1.1 Broker.
Dec 26 12:49:49 openHABianDevice systemd[1]: **mosquitto.service: Start request repeated too quickly.**
Dec 26 12:49:49 openHABianDevice systemd[1]: **mosquitto.service: Failed with result 'exit-code'.**
Dec 26 12:49:49 openHABianDevice systemd[1]: **Failed to start Mosquitto MQTT v3.1/v3.1.1 Broker.**
**[13:07:36]** **openhabian@openHABianDevice**:**~**$ sudo cat /var/log/mosquitto/mosquitto.log
cat: /var/log/mosquitto/mosquitto.log: No such file or directory
**[13:09:59]** **openhabian@openHABianDevice**:**~**$Run
sudo systemctl daemon-reload
sudo /bin/systemctl restart mosquitto.service
sudo /bin/systemctl status mosquitto.service
I have the same error like @Superpedro. This is what I get fot the given commands.
[13:27:05] openhabian@openHABianDevice:~$ sudo /bin/systemctl status mosquitto.service
● mosquitto.service - Mosquitto MQTT v3.1/v3.1.1 Broker
Loaded: loaded (/lib/systemd/system/mosquitto.service; enabled; vendor preset: enabled)
Active: failed (Result: exit-code) since Sat 2020-12-26 13:27:06 CET; 7s ago
Docs: man:mosquitto.conf(5)
man:mosquitto(8)
Process: 6089 ExecStart=/usr/sbin/mosquitto -c /etc/mosquitto/mosquitto.conf (code=exited, status=1/FAILURE)
Main PID: 6089 (code=exited, status=1/FAILURE)
Dec 26 13:27:06 openHABianDevice systemd[1]: mosquitto.service: Service RestartSec=100ms expired, scheduling restart.
Dec 26 13:27:06 openHABianDevice systemd[1]: mosquitto.service: Scheduled restart job, restart counter is at 5.
Dec 26 13:27:06 openHABianDevice systemd[1]: Stopped Mosquitto MQTT v3.1/v3.1.1 Broker.
Dec 26 13:27:06 openHABianDevice systemd[1]: mosquitto.service: Start request repeated too quickly.
Dec 26 13:27:06 openHABianDevice systemd[1]: mosquitto.service: Failed with result 'exit-code'.
Dec 26 13:27:06 openHABianDevice systemd[1]: Failed to start Mosquitto MQTT v3.1/v3.1.1 Broker.
Can you also check the mosquitto log file
IF there is not one there try adding one.
chown mosquitto /var/log/mosquitto/mosquitto.log
Thanks for this hint. Ther was no directory /var/log/mosquitto nor a logfile. I created them both and changed the fileowner to mosquitto as you suggested.
chown mosquitto /var/log/mosquitto/mosquitto.log
After that I could run the commands from above and resart the mosquitto service.
[14:26:04] openhabian@openHABianDevice:/var/log/mosquitto$ sudo /bin/systemctl status mosquitto.service
● mosquitto.service - Mosquitto MQTT v3.1/v3.1.1 Broker
Loaded: loaded (/lib/systemd/system/mosquitto.service; enabled; vendor preset: enabled)
Active: active (running) since Sat 2020-12-26 14:26:04 CET; 6s ago
Docs: man:mosquitto.conf(5)
man:mosquitto(8)
Main PID: 8178 (mosquitto)
Tasks: 1 (limit: 2182)
CGroup: /system.slice/mosquitto.service
└─8178 /usr/sbin/mosquitto -c /etc/mosquitto/mosquitto.conf
Dec 26 14:26:04 openHABianDevice systemd[1]: Starting Mosquitto MQTT v3.1/v3.1.1 Broker...
Dec 26 14:26:04 openHABianDevice systemd[1]: Started Mosquitto MQTT v3.1/v3.1.1 Broker.
just discovered that still the binding shows a communication error but I proved with mqtt.fx that the broker is running.
[quote="I created them both and changed the fileowner to mosquitto as you suggested.
[/quote]
How could I create them and how could I change the fileowner?
mkdir /var/log/mosquitto
touch /var/log/mosquitto/mosquitto.log
Did you setup a password?
yes when I installed mosquitto with the config tool
Can you post your broker code
UID: mqtt:broker:RPI4
label: MQTT Broker RPI4
thingTypeUID: mqtt:broker
configuration:
lwtQos: 0
publickeypin: false
keepAlive: 60
clientid: bbea88c4-bcd2-4eb3-bc01-49d14720018b
secure: false
certificatepin: false
password: pleasework
qos: 0
reconnectTime: 60000
host: 192.168.1.248
lwtRetain: true
username: openhabian
enableDiscovery: true
Brilliant!
so this was my config so far:
UID: mqtt:broker:openHAB
label: MQTT Broker
thingTypeUID: mqtt:broker
configuration:
lwtQos: 0
publickeypin: true
keepAlive: 60
clientid: 3b875904-088a-49da-8300-72ccd1447766
qos: 0
reconnectTime: 60000
host: localhost
secure: false
certificatepin: true
lwtRetain: true
enableDiscovery: true
with adding username and password it connects now to the broker again
UID: mqtt:broker:openHAB
label: MQTT Broker
thingTypeUID: mqtt:broker
configuration:
lwtQos: 0
publickeypin: true
keepAlive: 60
clientid: 4b8ce49d-81fe-410a-bd13-73973849eb25
secure: false
certificatepin: true
password: openhabian
qos: 0
reconnectTime: 60000
host: localhost
lwtRetain: true
enableDiscovery: true
username: openhabian
still I didn’t try to restart the rpi yet. Will do that as a next step. Also I discovered this thread with similar problems described for oh2: Openhabian - Mosquitto MQTT failed to start - #41 by mstormi