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MQTT Server: MQTT.js or Mosca? #151

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haio opened this Issue Dec 3, 2013 · 7 comments

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@haio

haio commented Dec 3, 2013

Hi, I want create a mqtt server, as is shown in the README, we can use either mqtt.createServer or Mosca, I don't know which should use, which is better?

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mcollina Dec 3, 2013

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mqtt.createServer do not implement the semantics of MQTT, it provides only the protocol parsing facility. If you want to learn about the protocol, this is the best option.
If you need a MQTT broker for a project, you should use Mosca as it requires much less time. Moreover, Mosca implements both offline and retained messages in a very efficient way.

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mcollina commented Dec 3, 2013

mqtt.createServer do not implement the semantics of MQTT, it provides only the protocol parsing facility. If you want to learn about the protocol, this is the best option.
If you need a MQTT broker for a project, you should use Mosca as it requires much less time. Moreover, Mosca implements both offline and retained messages in a very efficient way.

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haio Dec 4, 2013

Thank you for the response.Yet I met another problem with Mosca,I have 2 process, one running a Mosca broker, one running a subscriber with MQTT.js, let's say this issue: publish a message and i can sub it , but after i restart the broker, i can't sub new published message except restart the subscriber too.This issue won't happen in the MQTT.js server.

Thanks.

haio commented Dec 4, 2013

Thank you for the response.Yet I met another problem with Mosca,I have 2 process, one running a Mosca broker, one running a subscriber with MQTT.js, let's say this issue: publish a message and i can sub it , but after i restart the broker, i can't sub new published message except restart the subscriber too.This issue won't happen in the MQTT.js server.

Thanks.

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mcollina Dec 4, 2013

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I'm not sure which MQTT server in MQTT.js you are speaking about, as
MQTT.js do not implement any subscribing logic in the library, but only in
the examples.
That said, in MQTT there are two kind of clients, clean and unclean: clean
clients need to redo all their subscription when they reconnect, while
unclean clients do not. Moreover, if an unclean client do a subscription
with qos: 1 and then disconnect, it will receive all the messages that were
sent when it was offline.
MQTT.js clients are clean by default, so you have to listen to the
'connect' event and do all your subscriptions again.

I hope this helps. If you find issues regarding Mosca, please open a bug
there.

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mcollina commented Dec 4, 2013

I'm not sure which MQTT server in MQTT.js you are speaking about, as
MQTT.js do not implement any subscribing logic in the library, but only in
the examples.
That said, in MQTT there are two kind of clients, clean and unclean: clean
clients need to redo all their subscription when they reconnect, while
unclean clients do not. Moreover, if an unclean client do a subscription
with qos: 1 and then disconnect, it will receive all the messages that were
sent when it was offline.
MQTT.js clients are clean by default, so you have to listen to the
'connect' event and do all your subscriptions again.

I hope this helps. If you find issues regarding Mosca, please open a bug
there.

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haio Dec 4, 2013

I use mqtt.createServer discribe here, and the default client, it should be clean client. BTW, after listen the 'connect' event and resub the topic, my probelm get solved.

haio commented Dec 4, 2013

I use mqtt.createServer discribe here, and the default client, it should be clean client. BTW, after listen the 'connect' event and resub the topic, my probelm get solved.

@haio haio closed this Dec 4, 2013

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tennessine Jan 17, 2014

there's a clean session option indicate that this session is clean

tennessine commented Jan 17, 2014

there's a clean session option indicate that this session is clean

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csrgxtu Nov 10, 2014

i am wonder that weather MQTTJS supports the clean session functionality, sure it use clean session by default, but sometimes I want to use unclean session.

csrgxtu commented Nov 10, 2014

i am wonder that weather MQTTJS supports the clean session functionality, sure it use clean session by default, but sometimes I want to use unclean session.

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mcollina Nov 10, 2014

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MQTT.js Server does not handle the semantics of the MQTT protocol, as described above.

Mosca supports clean and unclean sessions.

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mcollina commented Nov 10, 2014

MQTT.js Server does not handle the semantics of the MQTT protocol, as described above.

Mosca supports clean and unclean sessions.

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