Re: [mosquitto-dev] Problems using Mosquitto Broker

[jianhui zhan <hui6075@xxxxxxxxxxx>]

I don't know. I guess TCP send/rcv buffer size had been reduced by your Windows kernel while you are using some other apps which need much memory, thus mosquitto clients' packet list and size get increased due to network throughput decreased, and mosquitto would discard some packets if the clients' inflight list and queued list both saturated. For that case, you can find log such as "Outgoing messages are being dropped for client xxx" if you have opened "log_type notice" in mosquitto.conf.

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From: mosquitto-dev-bounces@xxxxxxxxxxx <mosquitto-dev-bounces@xxxxxxxxxxx> on behalf of michele conficconi <conficconimichele@xxxxxxxxx>
Sent: Wednesday, January 17, 2018 10:00:02 PM
To: General development discussions for the mosquitto project
Subject: Re: [mosquitto-dev] Problems using Mosquitto Broker

 

I found the packet loss from a program I created:

Basically I send each message with a counter which keeps increasing as a new message is sent (this is my publisher). 

The subscriber reads each message and compares the counter with the previous one so that it understands if some packet has been lost or not, If the two numbers are consecutive, no data has been lost.

2018-01-17 14:38 GMT+01:00 jianhui zhan <hui6075@xxxxxxxxxxx>:

how did you find the packet loss? with err log like "Outgoing messages are being dropped for client xxx"?

otherwise, the console log could not be used as the evidence I think😉

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From: mosquitto-dev-bounces@eclipse.org <mosquitto-dev-bounces@eclipse.org> on behalf of Tatsuzo Osawa <tatsuzo.osawa@xxxxxxxxx>
Sent: Wednesday, January 17, 2018 21:25
To: General development discussions for the mosquitto project
Subject: Re: [mosquitto-dev] Problems using Mosquitto Broker

 

Understood.
You ran a mosquitto broker on Windows.
Sorry I have no expertise of mosquitto on Windows.

BR/Tatsuzo

2018-01-17 21:31 GMT+09:00 michele conficconi <conficconimichele@xxxxxxxxx>:
> Hi Tatsuzo,
> with the term "window" I just meant the tab of the "command promt", as the
> one attached here.
> If I minimize this tab while exchanging data between the 2 PLC I have no
> problem and everything works just fine. However, expanding this tab (I
> notice a spike in the CPU usage) the subscriber starts losing data.
>
> Regards,
> Michele.
>
> 2018-01-17 13:09 GMT+01:00 Tatsuzo Osawa <tatsuzo.osawa@xxxxxxxxx>:
>>
>> Hi Micheie,
>>
>> Could you explain more about the window? It's not a term of MQTT
>> protocol nor mosquitoo. Maybe it's a term of beckhoff PLC.
>> In addition, could you show the debug logs of mosquitto broker?
>>
>> Regards,
>> Tatsuzo
>>
>> 2018-01-17 18:07 GMT+09:00 michele conficconi
>> <conficconimichele@xxxxxxxxx>:
>> > Good morning,
>> > I'm developing a thesis project regarding machine to machine
>> > communication
>> > through MQTT protocol, and I'm using mosquitto as broker along with 2
>> > beckhoff PLCs.
>> >
>> > When dealing with encrypted communication (I'm using TLS pre shared key
>> > to
>> > exploit security), I have to properly configure the broker to let the 2
>> > PLC
>> > exchange data. And this is fine for me: I'm able to send and receive
>> > information using the MQTT libraries available from TWINCAT (Beckhoff
>> > software tool).
>> >
>> > I'd like also to get the packet loss depending on the speed of the
>> > Publisher
>> > and Subscriber and on the payload I'm sending.
>> >
>> > Doing some tests, I've notice that I've no packet loss in my
>> > communication,
>> > however if I enlarge the command window while the 2 plc are exchanging
>> > data
>> > (I can see that the 2 plc are communicating thanks to the messages in
>> > the
>> > window, as show in figure attached), I start losing packets.
>> > My question is:
>> > Is that normal? Is this a problem of the broker o may be the plc is not
>> > so
>> > powerful and it struggles to show also those messages? Beacuse I've
>> > noticed
>> > a spike of CPU usage, when enlarging the command window, which goes
>> > immediatly to 70/75%.
>> >
>> > I look forward to hear from you soon.
>> >
>> > Best regards,
>> > Michele
>> >
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