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| Can't connect to MQTT broker |
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| Author |
Message
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| Olivier GRACIANNE |
 Posted: Wed Jul 04, 2018 6:30 am Post subject: Can't connect to MQTT broker |
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Newbie
Joined: 04 Jul 2018
Posts: 3
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Hello,
I'm pretty new in everything about MQTT, and just had some days documenting myself.
Now I want to create an MQTT client using C# and the M2MQTT Library. So I tried the following :
| Code: |
MqttClient client = new MqttClient(hostName);
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to create my client. Then :
| Code: |
| client.MqttMsgPublishReceived = msgReceiveCallback(); |
to react to messages. Then, obviously :
| Code: |
| client.Connect(Guid.NewGuid().ToString()); |
which talks pretty good by itself. And eventually :
| Code: |
| client.Subscribe(topics, qosLevels); |
which is also pretty clear.
But when I use the web interface of the broker to send a message, the listenners I wrote doesn't trigger.
I think that my client isn't even connected. But though I've looked for a solution the past few days, I can't find out what is not working.
Any idea ? |
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| fjb_saper |
| Posted: Wed Jul 04, 2018 9:42 am Post subject: Re: Can't connect to MQTT broker |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY
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| Olivier GRACIANNE wrote: |
Hello,
I'm pretty new in everything about MQTT, and just had some days documenting myself.
Now I want to create an MQTT client using C# and the M2MQTT Library. So I tried the following :
| Code: |
MqttClient client = new MqttClient(hostName);
|
to create my client. Then :
| Code: |
| client.MqttMsgPublishReceived = msgReceiveCallback(); |
to react to messages. Then, obviously :
| Code: |
| client.Connect(Guid.NewGuid().ToString()); |
which talks pretty good by itself. And eventually :
| Code: |
| client.Subscribe(topics, qosLevels); |
which is also pretty clear.
But when I use the web interface of the broker to send a message, the listenners I wrote doesn't trigger.
I think that my client isn't even connected. But though I've looked for a solution the past few days, I can't find out what is not working.
Any idea ? |
Have you tried running the sample from MQExplorer? Remember that by default your MQTT server is not running. 
_________________
MQ & Broker admin |
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| Olivier GRACIANNE |
| Posted: Wed Jul 04, 2018 11:31 pm Post subject: |
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Newbie
Joined: 04 Jul 2018
Posts: 3
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Actually, "hostName" in
| Code: |
| new MqttClient(hostName) |
hides a real machine hostname, running an MQTT server I can publish and subscribe to through the web interface I mentionned.
Though, I didn't try to run this code in MQExplorer as I don't have one  |
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| Olivier GRACIANNE |
| Posted: Thu Jul 05, 2018 1:13 am Post subject: |
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Newbie
Joined: 04 Jul 2018
Posts: 3
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Fixed.
This was a stupid problem of habilitation. I didn't have access to the machine I was trying to talk to.
Sorry for asking help I was not needing. |
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| hughson |
| Posted: Thu Jul 05, 2018 1:21 pm Post subject: |
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Padawan
Joined: 09 May 2013
Posts: 1959
Location: Bay of Plenty, New Zealand
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| Olivier GRACIANNE wrote: |
| Sorry for asking help I was not needing. |
Don't worry about that 
Sometimes writing out your problem as a question to others helps in solving it. Amazing how many times that happens.
Cheers,
Morag
_________________
Morag Hughson @MoragHughson
IBM MQ Technical Education Specialist
Get your IBM MQ training here!
MQGem Software |
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