On 07/08/2019 22:35, Anil Gupta wrote:
Anil
Thanks for the response, but this
doesn't really solve the issues I raised.
Hello Peter,
It is my understanding that a listener is
associated with a port.
OK. My understanding is that a listener is associated with a socket
bound to an IP address and port. Presumably, each listener is a
unique socket instance.
I think that you are trying to assign port
1883 to local and internet connections Which is why you are
getting the error on daemon startup.
AFAIU, each interface will have its own separate port 1883?
There are a couple of ways to address the
issue.
- Use
different ports and ip address (listener / port combo) for
internet and local
- Listener
1883 ipaddr/localhost
- Listener
1885 ipaddr/internet facing
- Use default
port 1883 with no IP Address (listener) which will allow
internet and local devices to connect
- If there is
a firewall / router facing the internet, setup a forwarding
rule to redirect internet devices to come on 1883 but port
forwarded to second listener
I have turned off the firewall with no effect, so I infer this is
not a firewall issue.
To further explain my situation:
I have a Linux machine with three interfaces:
1) localhost (obviously)
2) A network card statically mapped to 192.168.0.1, which is
connected to wireless access point.
3) A second network card with a DHCP-leased IP address and
connected to the public internet.
I want to listen on (1) and (2) for MQTT traffic, but I do not
want to listen for *any* MQTT traffic on (3).
My mosquitto configuration file (/etc/mosquitto/mosquitto.conf)
is the default installed version. On top of this, I have a local
config file in /etc/mosquitto/conf.d that contains the following:
allow_anonymous false
connection_messages true
log_dest syslog
log_type error
log_type warning
password_file /etc/mosquitto/passwd
socket_domain ipv4
'A'
where 'A' is some set of directives to configure the listeners. I
have tried the following:
port 1883
bind_interface localhost
This works fine as verified with mosquitto_sub/pub, plus 'netstat
-tlpn' lists an LISTEN port associated with the mosquitto process.
From my reading of the docs & what I *want* to achieve, I
would have thought that the following should work for me:
listener 1883 localhost
listener 1883 192.168.0.1
but it does not! Testing with mosquitto_sub reports "Connection
refused", the log shows the "Error: Address already in use" message on
service startup, and netstat lists zero LISTEN ports
associated with mosquitto. FWIW, the following combinations
(tried individually!):
port 1883
bind_interface localhost
listener 1883 192.168.0.1
listener 1883
listener 1883 localhost
listener 1885 192.168.0.1
all give exactly the same outcome. Note the last variant using
different port numbers was suggested by Anil... but same outcome.
So. Any suggestions on what I am doing wrong here? Or what
fundamental point I have misunderstood?
Please note one you have made the changes,
you need to stop the mosquito process and restart it. Just
restarting the process does not help.
OK. Given that this thread will be archived, can I point out this
advice is not correct: 'systemctl restart' - by definition - stops
the service before restarting it, as can evidenced by the system
log. I think you are getting mixed up with 'reload', which does
exhibit the behaviour you describe.
...snip
Peter
