I'm running an MQTT server mosquitto version 2.0.11 on the same Raspberry Pi Bullseye (3 A+) as both broker and client. I had code working, but understand that one needs to modify a .conf file to get things working. I must still not be understanding something because here's my file:
# I had pid_file /run/mosquitto/mosquitto.pid below, but changed this when docs suggested below should be included if running automatically when device boots, which it will be.
pid_file /var/run/mosquitto/mosquitto.pid
persistence true
persistence_location /var/lib/mosquitto/
log_dest file /var/log/mosquitto/mosquitto.log
include_dir /etc/mosquitto/conf.d
listener 1883
allow_anonymous true
Now when I try to run mosquitto like this:
mosquitto -c /etc/mosquitto/conf.d/mosquitto.conf
I get this error:
1637370455: Loading config file /etc/mosquitto/conf.d/mosquitto.conf
1637370455: Error: Duplicate pid_file value in configuration.
1637370455: Error found at /etc/mosquitto/conf.d/mosquitto.conf:7.
1637370455: Error found at /etc/mosquitto/conf.d/mosquitto.conf:14.
Line 7 is the pid_file /var/run/mosquitto/mosquitto.pid
Line 14 is the include_dir /etc/mosquitto/conf.d
I can make basic pub and sub tests with localhost but still no luck with the hostname. Yes I know you should use security but I have an app that controls a robot over local WiFi and want to preserve app usage without changing that component too.
Any help on getting me back on track to getting the Mosquitto broker & client working on the same pi, allowing anonymous access, and running, is much appreciated. I hav gone through the docs, example file, and consulted other tutorials like Steve’s but proper configuration is still unclear. Thx!
Firstly the errors about not being able to open the pid or log files are because you are running mosquitto as a normal user (probably pi). This user does not have permission to read/write to file in /var/run or /var/log hence the failure when you try and run it "manually".
You've not said how you installed 2.0.11, as the default version bundled with Bullseys is still a 1.5.x build. Assuming you used the mosquitto.org repository then the mosquitto service will have been installed and configured. It will automatically pick up the default config file at /etc/mosquitto/mosquitto.conf as should be displayed with:
$ sudo service mosquitto status
● mosquitto.service - Mosquitto MQTT Broker
Loaded: loaded (/lib/systemd/system/mosquitto.service; enabled; vendor preset
Active: active (running) since Sun 2021-10-31 17:28:52 GMT; 2 weeks 5 days ag
Docs: man:mosquitto.conf(5)
man:mosquitto(8)
Process: 499 ExecStartPre=/bin/mkdir -m 740 -p /var/log/mosquitto (code=exited
Process: 505 ExecStartPre=/bin/chown mosquitto /var/log/mosquitto (code=exited
Process: 507 ExecStartPre=/bin/mkdir -m 740 -p /run/mosquitto (code=exited, st
Process: 510 ExecStartPre=/bin/chown mosquitto /run/mosquitto (code=exited, st
Process: 25679 ExecReload=/bin/kill -HUP $MAINPID (code=exited, status=0/SUCCE
Main PID: 511 (mosquitto)
Tasks: 1 (limit: 2181)
CGroup: /system.slice/mosquitto.service
└─511 /usr/sbin/mosquitto -c /etc/mosquitto/mosquitto.conf
Nov 19 00:00:10 www systemd[1]: Reloading Mosquitto MQTT Broker.
Nov 19 00:00:10 www systemd[1]: Reloaded Mosquitto MQTT Broker.
Warning: Journal has been rotated since unit was started. Log output is incomple
The simplest way to enable access from other machines is to do the following:
Reset the default config file to as it was when installed
# Place your local configuration in /etc/mosquitto/conf.d/
#
# A full description of the configuration file is at
# /usr/share/doc/mosquitto/examples/mosquitto.conf.example
pid_file /var/run/mosquitto/mosquitto.pid
persistence true
persistence_location /var/lib/mosquitto/
log_dest file /var/log/mosquitto/mosquitto.log
port 1883
include_dir /etc/mosquitto/conf.d
create a new file in /etc/mosquitto/conf.d e.g. called connect.conf
listener 1883
allow_anonymous true
restart the service with sudo service mosquitto restart