Connection to mosquitto fails

[irosaurus]

Hello Josar,

first of all thank you very much for releasing this awesome tool!

Since a couple of days I have the issue that RFmqtt cant connect to mosquitto anymore.

If I try it on the command line:

# ./RFmqtt
Running with -h localhost -p 1883 -u openhabian -x *************** -t 433MHz -g 3 -w 0
Can't connect to Mosquitto server

Service shows the following:

# systemctl status rfmqtt.service -l
● rfmqtt.service - RFmqtt Sniffer
   Loaded: loaded (/etc/systemd/system/rfmqtt.service; enabled)
   Active: activating (auto-restart) (Result: exit-code) since Sa 2020-06-13 22:12:12 CEST; 269ms ago
  Process: 12948 ExecStart=/srv/scripts/RFmqtt (code=exited, status=255)
 Main PID: 12948 (code=exited, status=255)

Jun 13 22:12:12 openHAB RFmqtt-Sniffer[12948]: Running with -h localhost -p 1883 -u openhabian -x *************** -t 433MHz -g 3 -w 0
Jun 13 22:12:12 openHAB systemd[1]: rfmqtt.service: main process exited, code=exited, status=255/n/a
Jun 13 22:12:12 openHAB systemd[1]: Unit rfmqtt.service entered failed state.

Already recompiled RFmqtt with the last RFmqtt.cpp, but didnt make any difference.
RFSniffer is working fine though.

I noticed that there was also a new version of mosquitto installed, 1.6.10. Before I was on 1.6.8.

Maybe there was a slight change how to connect?

All my other clients can connect to mosquitto without any issues though. Tried the highest debug level on mosquitto, but I cant even see the attempt from RFmqtt to connect to the service.

OS Openhabian on Raspberry:

# cat /etc/os-release
PRETTY_NAME="Raspbian GNU/Linux 8 (jessie)"
NAME="Raspbian GNU/Linux"
VERSION_ID="8"
VERSION="8 (jessie)"
ID=raspbian
ID_LIKE=debian
HOME_URL="http://www.raspbian.org/"
SUPPORT_URL="http://www.raspbian.org/RaspbianForums"
BUG_REPORT_URL="http://www.raspbian.org/RaspbianBugs"

Any hint would be very much appreciated.

Cheers iro

[y8s]

I am also running 1.6.10 and have noticed the can't connect error.
I tried downgrading to 1.6.8 again and it doesn't work with that either.
even using RFmqtt with no arguments doesn't work.

PRETTY_NAME="Raspbian GNU/Linux 10 (buster)"
NAME="Raspbian GNU/Linux"
VERSION_ID="10"
VERSION="10 (buster)"
VERSION_CODENAME=buster
ID=raspbian
ID_LIKE=debian
HOME_URL="http://www.raspbian.org/"
SUPPORT_URL="http://www.raspbian.org/RaspbianForums"
BUG_REPORT_URL="http://www.raspbian.org/RaspbianBugs"

[irosaurus]

I upgraded to Raspbian GNU/Linux 9 (stretch) in the meantime. Still the same issue - Can't connect to Mosquitto server.

@y8s Did you manage to fix it?

Cheers iro

[ramybt]

I have similar problem where only RFSNiffer work but RFmqtt not showing any received code . If you guys find a solution please post here i would appreciate this alot..

Thank you

Here where all happened for me!

https://community.openhab.org/t/433mhz-module/95515/27?u=ramy_rutu

[irosaurus]

Hey Ramy,

I saw your posts and I think you have a different issue, as y8s an me both see a message, that the connection to Mosquitto fails.

Whats your output when you run

# ./RFmqtt

?

Cheers iro

[y8s]

@irosaurus I didn't fix this issue. I circumvented it.

I was using this in nodered primarily, but since this issue never got fixed, I just put an exec node with RFSniffer in it. I then send the output payload of that to a big fat switch node with all the RF codes sorted appropriately.

It's still the biggest resource hog on my pi, but I guess that's life.

[ramybt]

Hey Ramy,

I saw your posts and I think you have a different issue, as y8s an me both see a message, that the connection to Mosquitto fails.

Whats your output when you run

# ./RFmqtt

?

Cheers iro

I dont have anything showing when i run ./RFmqtt

When i run ./RFSniffer i do get to see received code from my sensor

[ramybt]

[Josar]

@ramybt try to comment in the code which states for debbug and rebuild rfmqtt. Then run it again to see what is printet out. Also make sure to send something to the receiver.

And try to run it with "sudo".

[Josar]

@irosaurus can you publish a message from cmd line to your server?

[y8s]

@Josar mosquitto_pub and sub work just fine on my machine.

However:

Could it be something with RFmqtt forcing additional arguments (port, user, passwd...)?

[irosaurus]

Hi guys,

sorry for the late reply. Missed the email notifications...

@Josar: I have exactly the same result as @y8s - I can pub and sub without any issues. And also the same error when I try to run ./RFmqtt

I only noticed that mosquitto_pub/sub wants -P for the password and RFmqtt uses -x.

Let me know if I can test anything else.

Cheers iro

[Josar]

You have to insert the parameter or the default values are taken. This does not support no password or no user. It clearly states as output which values are used. So either config your server to except topics with this values or Insert the values your server is configured to.

@irosaurus -p is port, so I needed to use - x for password.

[y8s]

@Josar Here's the full version of the above:

even adding the default user pass to the passwordfile and using those for mosquitto_sub and mosquitto_pub works fine, but not with RFmqtt.

I also notice that while I can see my mosquitto_pub/sub subscription/message in the mosquitto log, I do not see anything from RFmqtt. mosquitto log is set to debug. I'm not sure if I would expect to see.

If I deliberately try to connect with a wrong password, I still get something with mosquitto_pub (mosquitto config is set to allow anonymous)

example:

pi@iot:~ $ mosquitto_pub -h localhost -u admin -P thisisntit -t testtopic/failuretopic -m testmessage

(from log)
1605717736: No will message specified.
1605717736: Sending CONNACK to mosq-SIqLdE1Nh73d0Cau1i (0, 0)
1605717736: Received PUBLISH from mosq-SIqLdE1Nh73d0Cau1i (d0, q0, r0, m0, 'testtopic/failuretopic', ... (11 bytes))
1605717736: Received DISCONNECT from mosq-SIqLdE1Nh73d0Cau1i

[irosaurus]

Same here, I also see nothing in the mosquitto log when I use the correct password with RFmqtt.

@Josar mosquitto_pub uses -p for the port and -P for the password. But I guess that doesn't really matter here.

Let me know if I can help testing anything else.

Cheers iro

[Ratsea34]

I have got it working and am not now getting the 'can't connect' message. The script says don't change the keep-alive value 0, but I changed it to 10 and everything now works.
// Establish a connection to the MQTT server. Do not use a keep-alive ping
int ret = mosquitto_connect (mosq, host, port, 10); // I changed this to 10 from 0

Update - it does however stop after a while, but this is clearly the problem area. I don't know how to resolve it other that a reboot every 12 hrs and a keep-alive time in excess of that. (Bodge!)