See section 3.1.3.1: A Server MAY allow a Client to supply a ClientId that has a length of zero bytes, however if it does so the Server MUST treat this as a special case and assign a unique ClientId to that Client. It MUST then process the CONNECT packet as if the Client had provided that unique ClientId [MQTT-3.1.3-6]. Mandatory, yes, but can be zero length J Benjamin. De : <mosquitto-dev-bounces@xxxxxxxxxxx> au nom de "ನಾಗೇಶ್ ಸುಬ್ರಹ್ಮಣ್ಯ (Nagesh S)" <nageshblore@xxxxxxxxx>
Répondre à : General development discussions for the mosquitto project <mosquitto-dev@xxxxxxxxxxx>
Date : mercredi 7 décembre 2016 à 05:42
À : General development discussions for the mosquitto project <mosquitto-dev@xxxxxxxxxxx>
Objet : Re: [mosquitto-dev] WITH_SRV=no WITH_UUID=no On your comment, "The UUID lib is used by the broker to generate random client ids when
a client connects with a zero length client id.", the spec says the client identifier is mandatory in the CONNECT packet. So, is the zero length client id some thing specific to mosquitto? Besides, how does cleanSession=FALSE work in this scenario? Regards, Nagesh On Wed, Dec 7, 2016 at 3:16 AM, Roger Light <roger@xxxxxxxxxx> wrote: Hi,
Ben is half right :)
The UUID lib is used by the broker to generate random client ids when
a client connects with a zero length client id. If you don't use
WITH_UUID then the broker generates a random id in a simpler way.
There shouldn't be any downside to using WITH_UUID=no.
Cheers,
Roger
On Tue, Dec 6, 2016 at 9:14 PM, Ben Hardill <hardillb@xxxxxxxxx> wrote:
> Joshua,
>
> The WITH_SRV is only used by the mosquitto clients (mosquitto_sub &
> mosquitto_pub) so if you're building a container to host a broker it
> shouldn't change anything. The SRV DNS records are used to look up a
> broker at a domain level, in a similar way to SIP servers. e.g. if you
> have a broker hosted on broker.example.com you could set up a SRV record
> in the DNS to point to it when you look up _mqtt._tcp.example.com.
>
> Again the UUID used in the clients to create unique client ids for the
> command line clients.
>
> So if you are only interested in the broker then compiling without these
> options will not have any impact.
>
> Ben
>
> On 06/12/16 17:44, Pappalardo, Joshua wrote:
>> I am trying to install Mosquitto on an Alpine image for use in a cisco
>> router. In order to be able to get around some build dependencies I have
>> compiled using WITH_SRV=no and WITH_UUID=no,
>>
>> I am wondering what exactly are the implications on the broker using
>> disabling DNS and UUID, as the documentation is not very clear on what
>> exactly dns and uuid generation on the broker provides?
>>
>> I am mostly just curious if it is worth the effort to try and satisfy
>> the build dependencies or not.
>>
>>
>>
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