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Re: [mosquitto-dev] Problems using Mosquitto Broker
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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Attachment: Prompt.JPG
Description: JPEG image

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