Re: [mosquitto-dev] MQTT „The connection was lost.“ inside same subnet

[Karl Schuh <k.schuh@xxxxxxxxxxx>]

Hi Roger,
thank you - thats exactly what I did. Since I need to use the python module paho, I installed all corresponding software from mosquitto.org and now it works perfectly.

Regards, Karl.


----- Ursprüngliche Mail -----
Von: "Roger Light" <roger@xxxxxxxxxx>
An: "mosquitto-dev" <mosquitto-dev@xxxxxxxxxxx>
Gesendet: Samstag, 7. September 2019 18:38:06
Betreff: Re: [mosquitto-dev]	MQTT „The connection was lost.“ inside same subnet

Hi Karl,

You're quite right. Version 0.15 is now seven and a half years old.
I'd suggest getting something more recent - there are Debian/raspbian
repos at repo.mosquitto.org. If you have 0.15 from raspbian though,
then I would guess you are on an unsupported raspbian release and so
won't find the right packages at repo.mosquitto.org.

Regards,

Roger

On Sat, 7 Sep 2019 at 08:47, Karl Schuh <k.schuh@xxxxxxxxxxx> wrote:
>
> Hi,
> I found out myself. The problem is in the different MQTT-protocols. It looks like the broker only supports version 3.1, but my client (RasPi) defaults to version 3.1.1. When I use
>      mosquitto_sub -h 192.168.131.5 -p 1883 -t "info/#" -V 31
> on the RasPi it works :-))
>
> Ing. Karl SCHUH
>
> ________________________________
> Von: "Karl SCHUH" <k.schuh@xxxxxxxxxxx>
> An: "mosquitto-dev" <mosquitto-dev@xxxxxxxxxxx>
> Gesendet: Freitag, 6. September 2019 13:06:24
> Betreff: MQTT „The connection was lost.“ inside same subnet
>
> Hi @ all,
>
> I need mqtt-function on a raspberry pi for my home-automation system. It worked at home with a broker-installation I made a few months ago. Since I am away from home for 3 weeks I took the raspi with me.
>
> I use my laptop (internat network-addr 192.168.131.5) as router to the internet and made a new install of mosquitto (0.15-2+deb7u3ubuntu0.1 on LinuxMint 17.3 - it says „ MQTT v3.1 broker“ when I try mosquitto -v). mosquitto_sub and mosquitto_pub (0.15-2+deb7u3ubuntu0.1) work, when used on the laptop. I also did a test with „ test.mosquitto.org“ and it worked. I have only enabled logging at debug-level in the config-file, nothing else changed.
>
> When I try mosquitto_sub -h 192.168.131.5 -t „#“ on the RasPi (192.168.131.192) nothing happens when I publish something from the laptop. mosquitto_sub is version is 1.6.4. Tcpdump and wireshark (on the laptop) show a MQTT-connect packet, but no MQTT-ack for it. Nothing is shown in syslog on the laptop. It looks like the packet did never reach the server-process. Of course I tried to disable the firewall on the laptop. On the laptop netstat shows port 1883 listening.
>
> Trying mosquitto_pub on the RasPi brings up „Error: The connection was lost.“ Nothing in syslog on the laptop too. I also tried another client-id, but noting different.
>
> pi@GSM-testRasPi:~ $ mosquitto_pub -i "raspi" -h 192.168.131.5 -p 1883 -t "info/room107" -m "test from raspi"
>
> Error: The connection was lost.
>
> I also tried the test with „ test.mosquitto.org“ on the RasPi and it worked.
>
> So, to me, the server seems to be OK and the client too, but they don't work together. Why?
>
> Any help appreciated, Karl.
>
>
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