Re: [mosquitto-dev] two-way communication

[Roger Light <roger@xxxxxxxxxx>]

Hi Ahmet,

The Raspberry Pi packages provided by the project aren't available as
yet because I've been having problems with incompatibility when cross
compiling that I need to sort out. You should still be getting a more
recent version if you've configured repo.mosquitto.org though. Could
you see what the output of `apt-cache policy mosquitto` shows?

Your ubuntu problem is described in the error log - something didn't
work properly when installing/upgrading the package so it isn't
installed fully. I have tried an install and an upgrade on my system
and everything went ok, so I assume there must be a small something
odd on your end. Perhaps you could try removing the old version and
reinstalling.

Regards,

Roger

On Thu, 18 Aug 2022 at 13:27, Ahmet Tekelioglu via mosquitto-dev
<mosquitto-dev@xxxxxxxxxxx> wrote:
>
> Hi Roger,
>
> At the Ubuntu server, instead of apt-get upgrade, I did apt-get install mosquitto mosquitto-dev
>
> Long story short, here is the error message and the configuration file that worked perfectly in the old version.
>
> Setting up mosquitto (2.0.15a-0mosquitto1~focal1) ...
> Job for mosquitto.service failed because the control process exited with error code.
> See "systemctl status mosquitto.service" and "journalctl -xe" for details.
> invoke-rc.d: initscript mosquitto, action "restart" failed.
> ● mosquitto.service - Mosquitto MQTT Broker
>      Loaded: loaded (/lib/systemd/system/mosquitto.service; enabled; vendor preset: enabled)
>      Active: activating (auto-restart) (Result: exit-code) since Thu 2022-08-18 15:20:12 +03; 6ms ago
>        Docs: man:mosquitto.conf(5)
>              man:mosquitto(8)
>     Process: 2612 ExecStartPre=/bin/mkdir -m 740 -p /var/log/mosquitto (code=exited, status=0/SUCCESS)
>     Process: 2613 ExecStartPre=/bin/chown mosquitto:mosquitto /var/log/mosquitto (code=exited, status=0/SUCCESS)
>     Process: 2621 ExecStartPre=/bin/mkdir -m 740 -p /run/mosquitto (code=exited, status=0/SUCCESS)
>     Process: 2622 ExecStartPre=/bin/chown mosquitto:mosquitto /run/mosquitto (code=exited, status=0/SUCCESS)
>     Process: 2623 ExecStart=/usr/sbin/mosquitto -c /etc/mosquitto/mosquitto.conf (code=exited, status=1/FAILURE)
>    Main PID: 2623 (code=exited, status=1/FAILURE)
>
> Aug 18 15:20:13 nbs systemd[1]: Starting Mosquitto MQTT Broker...
> Aug 18 15:20:13 nbs mosquitto[2666]: 1660825213: Loading config file /etc/mosquitto/conf.d/broker.conf
> Aug 18 15:20:13 nbs systemd[1]: mosquitto.service: Main process exited, code=exited, status=1/FAILURE
> Aug 18 15:20:13 nbs systemd[1]: mosquitto.service: Failed with result 'exit-code'.
> Aug 18 15:20:13 nbs systemd[1]: Failed to start Mosquitto MQTT Broker.
> Aug 18 15:20:14 nbs systemd[1]: mosquitto.service: Scheduled restart job, restart counter is at 5.
> Aug 18 15:20:14 nbs systemd[1]: Stopped Mosquitto MQTT Broker.
> Aug 18 15:20:14 nbs systemd[1]: mosquitto.service: Start request repeated too quickly.
> Aug 18 15:20:14 nbs systemd[1]: mosquitto.service: Failed with result 'exit-code'.
> Aug 18 15:20:14 nbs systemd[1]: Failed to start Mosquitto MQTT Broker.
> dpkg: error processing package mosquitto (--configure):
>  installed mosquitto package post-installation script subprocess returned error exit status 1
> dpkg: dependency problems prevent configuration of mosquitto-dev:
>  mosquitto-dev depends on mosquitto (<< 2.0.15a-0mosquitto1~focal1.1~); however:
>   Package mosquitto is not configured yet.
>  mosquitto-dev depends on mosquitto (>= 2.0.15a-0mosquitto1~focal1); however:
>   Package mosquitto is not configured yet.
>
> dpkg: error processing package mosquitto-dev (--configure):
>  dependency problems - leaving unconfigured
> Errors were encountered while processing:
>  mosquitto
>  mosquitto-dev
> E: Sub-process /usr/bin/dpkg returned an error code (1)
>
>
>
>
> ahmett@nbs:/etc/mosquitto/conf.d$ vi broker.conf
>
> listener 8883
> tls_version tlsv1.3
> ciphers ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-SHA384:ECDHE-ECDSA-AES128-SHA256
> cafile /etc/mosquitto/ca_certificates/ca.crt
> certfile /etc/mosquitto/certs/nbstakibi.crt
> keyfile /etc/mosquitto/certs/nbstakibi.key
> require_certificate true
> max_inflight_messages 1
> max_queued_messages 6000
>
>
> Ahmet Tekelioglu
> +90 (530) 410 9807
>
> On 18 Aug 2022, at 01:11, Roger Light <roger@xxxxxxxxxx> wrote:
>
> Hi Ahmet,
>
> I haven't heard of anything like that, sorry. Do you have any more
> details of how exactly you are setting things up?
>
> Regards,
>
> Roger
>
> On Wed, 17 Aug 2022 at 11:01, Ahmet Tekelioglu via mosquitto-dev
> <mosquitto-dev@xxxxxxxxxxx> wrote:
>
>
> Hello,
>
>
> I am using mosquitto in an application that collects telemetry data form several dozen clients. I have already activated the MQTT/TLS parameters and selected relatively safe TLS parameters. However, partly out of curiosity, I am also implementing the Diffir-Hellman protocol for key exchange. The protocol itself works fine and produces the same key at both ends, the client and the server. It is possible to exchange keys many times and that part appears to work flawlessly.
>
>
> However, after the first key exchange, I find that the telemetry data arriving from the clients becomes erratic so that only one third is saved to the database. Before the Diffie-Hellman protocol, data transfer was always one-way, from the clients to the server. The trouble started when I began to send D-H responses to the client from the server. Any clues?
>
>
> Has anybody run into unexpected behaviour after two-way messaging?
>
>
> Ahmet Tekelioglu
>
> +90 (530) 410 9807
>
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