Mosquitto broker set up issue

Mosquitto MQTT Broker
1

I follow up the tutorial to set up the mosquitto broker on window
steps:-
1)download the broker from website
2)install it
3)change in config file to run the broker on local IP
listener 1883 0.0.0.0
max_packet_size 10000
allow_anonymous true
4)Windows Defender Firewall->advanced setting->inbound rules->new rule->make TCP port 1883
5)services->mosquitto broker ->automatic

command prompt

C:\Program Files\mosquitto>net start mosquitto

The Mosquitto Broker service was started successfully.

C:\Program Files\mosquitto>mosquitto_sub -h localhost -t test
Error: No connection could be made because the target machine actively refused it.

when manually start the mosquitto broker by services i got this …

the mosquitto broker services on local computer started and then stopped .some services stopped automatically if thay are not in use by other services or program

2

please reply ASAP ,thank you
any help will be appreciated

3

Hello,

Some things to check:

  • Can you set the logs of your broker to log_tye all and check the logs, please?

  • Further, can you check if only Mosquitto is using the port 1883 on that machine? So there are no port conflicts.

4

mosquitto -c "C:\Program Files\Mosquitto\mosquitto.conf" -v > mosquitto.log 2>&1

I make mosquitto.log successfully when I opened it. I got this
1718003183: Error: Unable to open log file C:\Program Files\Mosquitto\mosquitto.log for writing.
^C

5

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6

C:\Program Files\mosquitto> sc start mosquitto

SERVICE_NAME: mosquitto
TYPE : 10 WIN32_OWN_PROCESS
STATE : 4 RUNNING
(STOPPABLE, NOT_PAUSABLE, ACCEPTS_SHUTDOWN)
WIN32_EXIT_CODE : 0 (0x0)
SERVICE_EXIT_CODE : 0 (0x0)
CHECKPOINT : 0x0
WAIT_HINT : 0x0
PID : 10392
FLAGS :

C:\Program Files\mosquitto>mosquitto_pub -i mosq_pub1 -t “Test topic” -m “Test message” -d
Client mosq_pub1 sending CONNECT
Client mosq_pub1 received CONNACK (0)
Client mosq_pub1 sending PUBLISH (d0, q0, r0, m1, ‘Test topic’, … (12 bytes))
Client mosq_pub1 sending DISCONNECT

C:\Program Files\mosquitto>mosquitto_sub -i mosq_sub1 -t “Test topic” -d
Client mosq_sub1 sending CONNECT
Client mosq_sub1 received CONNACK (0)
Client mosq_sub1 sending SUBSCRIBE (Mid: 1, Topic: Test topic, QoS: 0, Options: 0x00)
Client mosq_sub1 received SUBACK
Subscribed (mid: 1): 0
Client mosq_sub1 sending PINGREQ
Client mosq_sub1 received PINGRESP

7

To activate the logs in windows you have to allow the “write” rule for that folder in the folder settings. It is a windows permission problem, that can appear. The logs are important for debugging.

On the other hand, I do not see a problem in your statements here:

C:\Program Files\mosquitto>mosquitto_pub -i mosq_pub1 -t “Test topic” -m “Test message” -d
Client mosq_pub1 sending CONNECT
Client mosq_pub1 received CONNACK (0)
Client mosq_pub1 sending PUBLISH (d0, q0, r0, m1, ‘Test topic’, … (12 bytes))
Client mosq_pub1 sending DISCONNECT

C:\Program Files\mosquitto>mosquitto_sub -i mosq_sub1 -t “Test topic” -d
Client mosq_sub1 sending CONNECT
Client mosq_sub1 received CONNACK (0)
Client mosq_sub1 sending SUBSCRIBE (Mid: 1, Topic: Test topic, QoS: 0, Options: 0x00)
Client mosq_sub1 received SUBACK
Subscribed (mid: 1): 0
Client mosq_sub1 sending PINGREQ
Client mosq_sub1 received PINGRESP

The clients do connect and send packages.
I am not sure, what your problem is exactly.

Further, I do not think the error message you provided exists in mosquitto. How do you get this exactly?
Error: No connection could be made because the target machine actively refused it.

8

This problem is solved now .
I have given the folder read and write permission…

but I can’t see the message content

10

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12

Have you subscribed while you are publishing? You only receive messages, if both the Sub and Pub are online at the same time.

You could set the retain flag for a publish, then you can first publish and then subscribe and still get the last message on a topic.