MQTT PUB AND SUB

[pieuser]

hello all,
i am using raspbian and installed mosquitto broker and client in it. it publishes and subscribes message through local network only. if i try to connect to other network it shows error like no route to host. how to send data to other network from my pi 3.

[DougieLawson]

You need to ensure you have normal connectivity. Can you ssh from one Raspberry to the other (assuming they are on the same LAN). If the remote Raspberry is on a seperate network you'll need to use SSL communication for Mosquitto (port 8883) and open that through your firewall.

To test networking use
ifconfig -a
ip route
ping -c3 $(ip route | awk '/default/ {print $3}')
ping -c3 8.8.8.8
ping -c3 google.com
cat /etc/resolv.conf

[pieuser]

thanks for the help. i try to send some data from my pi3 to other network , all network connection are ok. but in that ip it is not connecting at all. how to connect and send data to other network.

[DougieLawson]

On the connect use the hostname, FQDN or fixed IPaddress of the remote server.

mosquitto_pub -h test.mosquitto.org -t "foo/bar" -m "message payload"
mosquitto_pub -h 192.168.3.14 -t "raspberry/pi" -m "LAN based machine"
mosquitto_pub -h raspberry.local -t "fully/qualified/local/domain" -m "works with names to"


http://www.steves-internet-guide.com/cl ... thon-mqtt/

[pieuser]

thanks dougie for ur information, data is sent to the server successfully. but i opened the server but not able to see my data.

sometimes it fires some error not connecting to the server properly . this is the type of error i faced
1.mosquitto_sub -h 192.168.3.14 -t "raspberry/pi"
Error: Connection timed out

2.mosquitto_sub -h raspberry.local -t "fully/qualified/local/domain"
Unable to connect (Lookup error.).

how to solve the issue, all network connections are ok i check.

[DougieLawson]

Is your mosquitto at 192.168.3.14 running and listening on port 1883 (or ssl port 8883)?

Take a look with sudo netstat -tlnp | grep mosq

To get addressing with a domain name working you either need to run bind9, dnsmasq or avahi-daemon.

[pieuser]

yes i ping with that ip but it not responding.

[DougieLawson]

Ping is an ICMP packet, that simply proves the hardware and ICMP/IP works. You need to prove that TCP/IP to port 1883 works. So the first test is that your Mosquitto server is listening for inbound connections.

[pieuser]

got the response like this

tcp 0 0 0.0.0.0:1883 0.0.0.0:* LISTEN 566/mosquitto
tcp6 0 0 :::1883 :::* LISTEN 566/mosquitto

looks like it working.

[DougieLawson]

So try this:

mosquitto_sub -v -t "#" -h "127.0.0.1" &
mosquitto_pub -h 192.168.3.14 -t "test/me" -m "$(date)"

[pieuser]

Connection Refused: not authorised.
Connection Refused: not authorised.
Connection Refused: not authorised.
Connection Refused: not authorised.
Connection Refused: not authorised.
Connection Refused: not authorised.
Connection Refused: not authorised.
Connection Refused: not authorised.
Connection Refused: not authorised.
Connection Refused: not authorised.
Connection Refused: not authorised.
Connection Refused: not authorised.
Connection Refused: not authorised.
Connection Refused: not authorised.
Connection Refused: not authorised.
Connection Refused: not authorised.
Connection Refused: not authorised.

no connection to the other network failures.

[DougieLawson]

What's in /etc/mosquitto/mosquitto.conf and in /etc/mosquitto/conf.d/*.conf?

[pieuser]

it saved total configuration log, error, connection details of mosquitto.
dougie just tell me i have one pi3 raspbian os and mosquitto as broker installed . so i try to send data from my pi to other system . what r the procedure should i follow. i have write some c code in geany. if u have some reference of c examples code then u can share with me. because previous all the steps working but somehow network connection failures. so please suggest what is best for this project.

[DougieLawson]

I don't use Geany.

Here's my mosquitto.conf

Code: Select all

# 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.pid

persistence true
persistence_location /var/lib/mosquitto/

log_dest file /var/log/mosquitto/mosquitto.log

include_dir /etc/mosquitto/conf.d

and /etc/mosquitto/conf.d/ws.conf

Code: Select all

listener 1883
protocol mqtt

listener 9001
protocol websockets

That works with every pub/sub client I've tried in python or C.

[pieuser]

my mosquitto.conf file looks like this:
almost same as urs,

# 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.pid

persistence true
persistence_location /var/lib/mosquitto/

log_dest file /var/log/mosquitto/mosquitto.log

persistence_file mosquitto.db
log_dest syslog
log_dest stdout

log_dest topic

log_type error
log_type warning
log_type notice
log_type information

connection_messages true
log_timestamp true

include_dir /etc/mosquitto/conf.d
allow_anonymous false
password_file /etc/mosquitto/pwfile


i just typed ur portion of file but same result time out and no connection.

[DougieLawson]

Mine are not a portion, that's it everything. All other configurable options are left to default.

What version of Mosquitto are you running?

[pieuser]

so what is the main problem for connection. version 1.14.

[DougieLawson]

Is networking working? Can you ping the pi from other machines on your network? Can you ssh into it?

Is mosquitto listening?
sudo netstat -tlnp | grep mosq

[pieuser]

local network its working not on other network. command also not working. do u have any c code example for this.

[DougieLawson]

local network its working not on other network. command also not working.

What does that mean?

do u have any c code example for this.

Nothing I've written is shareable (because I can't remember if it works or still needs some hacking).

There's lots of stuff here: https://github.com/mqtt/mqtt.github.io/wiki/libraries

[pieuser]

but program i got that running in local network only , but for other network or ip when i gave it not responds at all.
another problem is my my ip and my etho ip what i have saved in /etc/network/interface not same . what ever i saved or changed in that file no effect on pi ip address. its not saved . i think that may be a problem ,is this ?

[pieuser]

is there any solution for /etc/network/interface file and /etc/dhcpcd/dhcpcd.conf file , how to save the info in the file.

[DougieLawson]

Use sudo vi ... or sudo nano ... or open a root shell with sudo -s

[pieuser]

no it saved but ip not change at all.

[pieuser]

but program i got that running in local network only , but for other network or ip when i gave it not responds at all.
another problem is my my ip and my etho ip what i have saved in /etc/network/interface not same . what ever i saved or changed in that file no effect on pi ip address. its not saved . i think that may be a problem ,is this ?