I am learning mqtt,mosquitto and test on my localhost is work well.

And then,i rent a linux centos 8 machine and install mosquitto, i try to publish a message to that linux broker from my local windows ip. But it always show TimeoutError: [WinError 10060],I have google but still don't know where is the problem?

I have tried to publish from my windows local ip to test.mosquitto.org and subscribe from linux,it's work!!

I have no idea.

publish:

local broker
.\mosquitto_pub -h 192.168.168.100 -p 1883 -t test -m 'hi'
# mosquitto test server
.\mosquitto_pub -h test.mosquitto.org -p 1883 -t test -m 'hi'

 

subscribe

hi

 

but,when i change the ip address to IDC Linux ip,it alway show show TimeoutError: [WinError 10060] local publish to IDC linux

.\mosquitto_pub -h 192.168.168.100 -p 1883 -t test -m 'hi'
TimeoutError: [WinError 10060]

use python paho to publish,the same error

import paho.mqtt.client as mqtt
import random
import json
import datetime
import time
'''
ISOTIMEFORMAT = '%m/%d %H:%M:%S'
client = mqtt.Client()

client.connect("192.168.168.100", 1883, 60)

while True:
    t0 = random.randint(0, 30)
    t1 = random.randint(30, 40)
    t = datetime.datetime.now().strftime(ISOTIMEFORMAT)
    topic1 = {'Temperature': t0, 'Time': t}
    topic2 = {'Temperature': t1, 'Time': t}
    print(json.dumps(topic1))
    print(json.dumps(topic2))

    client.publish("test", json.dumps(topic1))
    client.publish("mytopic_2", json.dumps(topic2))

    time.sleep(5)

update,maybe is's error

user@Ubuntu:~$ mosquitto -v
1601989020: mosquitto version 1.6.12 starting
1601989020: Using default config.
1601989020: Opening ipv4 listen socket on port 1883.
1601989020: Error: Address already in use

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Edited October 13, 20205 yr by tobimarsh43
added code

A timeout message at the socket level suggests that your firewall is blocking port 1883.

To check.