# Mqtt broker does not receive data and no generate debug message

**URL:** <https://discourse.nodered.org/t/mqtt-broker-does-not-receive-data-and-no-generate-debug-message/10744>\
**Category:** General\
**Created:** [2 May 2019 09:32 UTC](https://discourse.nodered.org/t/mqtt-broker-does-not-receive-data-and-no-generate-debug-message/10744 "2019-05-02T09:32:15Z")\
**Posts on this page:** 14\
**Page:** 1

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**Author:** ![muharremsari](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/muharremsari/32/7996_2.png) [@muharremsari](https://discourse.nodered.org/u/muharremsari)\
**Post date:** [2 May 2019 09:32 UTC](https://discourse.nodered.org/t/mqtt-broker-does-not-receive-data-and-no-generate-debug-message/10744/1 "2019-05-02T09:32:15Z")

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![mqtt_](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/2X/9/98740022e83bbc4e8357c1bcc66bfcb2d2abba6f.jpeg)

Hi

I was create flow for mqqt broker. Mqqt broker runing on win7 32bit machine. Mosquitto service is ok still runing and connected. But i can't recive an debug message or somone. What is my fault?

Best regards.

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**Author:** ![ukmoose](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/ukmoose/32/13_2.png) [@ukmoose](https://discourse.nodered.org/u/ukmoose)\
**Post date:** [2 May 2019 09:33 UTC](https://discourse.nodered.org/t/mqtt-broker-does-not-receive-data-and-no-generate-debug-message/10744/2 "2019-05-02T09:33:59Z")

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how you you configured the MQTT node?  
what topic are you subscribing to?  
what topic are you publishing data to?

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**Author:** ![muharremsari](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/muharremsari/32/7996_2.png) [@muharremsari](https://discourse.nodered.org/u/muharremsari)\
**Post date:** [2 May 2019 09:39 UTC](https://discourse.nodered.org/t/mqtt-broker-does-not-receive-data-and-no-generate-debug-message/10744/3 "2019-05-02T09:39:58Z")

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![mqtt_node_settings](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/2X/7/7eed25a816457860490f863d06de796c17c0679a.jpeg) ![mqtt_agent_settings](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/2X/b/bbfa4a41b3e2dc09236043d742974777c972e322.jpeg)

i was configure that's it.

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**Author:** ![ukmoose](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/ukmoose/32/13_2.png) [@ukmoose](https://discourse.nodered.org/u/ukmoose)\
**Post date:** [2 May 2019 09:53 UTC](https://discourse.nodered.org/t/mqtt-broker-does-not-receive-data-and-no-generate-debug-message/10744/4 "2019-05-02T09:53:59Z")

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Have you checked that you can receive the messages using a different client?  
[https://www.hivemq.com/blog/seven-best-mqtt-client-tools/](https://www.hivemq.com/blog/seven-best-mqtt-client-tools/)

or tried replacing the specific topic with a MQTT wildcard?

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**Author:** ![muharremsari](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/muharremsari/32/7996_2.png) [@muharremsari](https://discourse.nodered.org/u/muharremsari)\
**Post date:** [2 May 2019 10:34 UTC](https://discourse.nodered.org/t/mqtt-broker-does-not-receive-data-and-no-generate-debug-message/10744/5 "2019-05-02T10:34:32Z")

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![mqtt_test_on_broker_machine](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/2X/e/ea7739a59228bdecb240c9c73e66b6287c5f6f9d.jpeg) ![mqqt_client_test](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/2X/0/013a84f7c8b8e9fc6f5bfe0dca2f76469bc928b4.jpeg)

I've checked. I share result.

I tried replace topic with unique name but still same ☹

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**Author:** ![edje11](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/edje11/32/572_2.png) [@edje11](https://discourse.nodered.org/u/edje11)\
**Post date:** [2 May 2019 11:08 UTC](https://discourse.nodered.org/t/mqtt-broker-does-not-receive-data-and-no-generate-debug-message/10744/6 "2019-05-02T11:08:06Z")

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Try in NR: **/#** (wildcard) for the topic, then you subscribed to everything, handy for debugging.

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**Author:** ![muharremsari](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/muharremsari/32/7996_2.png) [@muharremsari](https://discourse.nodered.org/u/muharremsari)\
**Post date:** [2 May 2019 11:37 UTC](https://discourse.nodered.org/t/mqtt-broker-does-not-receive-data-and-no-generate-debug-message/10744/7 "2019-05-02T11:37:31Z")

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> [@edje11](#):
>
> (wildcard)

 ![mqtt_wildcard_change](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/2X/9/91b473028f7025de5ed36f7664f4e348561e5413.jpeg)

no response ☹

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**Author:** ![ukmoose](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/ukmoose/32/13_2.png) [@ukmoose](https://discourse.nodered.org/u/ukmoose)\
**Post date:** [2 May 2019 11:46 UTC](https://discourse.nodered.org/t/mqtt-broker-does-not-receive-data-and-no-generate-debug-message/10744/8 "2019-05-02T11:46:06Z")

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/# and # are different in MQTT

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**Author:** ![muharremsari](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/muharremsari/32/7996_2.png) [@muharremsari](https://discourse.nodered.org/u/muharremsari)\
**Post date:** [2 May 2019 11:51 UTC](https://discourse.nodered.org/t/mqtt-broker-does-not-receive-data-and-no-generate-debug-message/10744/9 "2019-05-02T11:51:07Z")

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> [@ukmoose](#):
>
> /# and #

i recive debug message "Invalid topic specified" then put /# in topic line.

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**Author:** ![muharremsari](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/muharremsari/32/7996_2.png) [@muharremsari](https://discourse.nodered.org/u/muharremsari)\
**Post date:** [2 May 2019 12:03 UTC](https://discourse.nodered.org/t/mqtt-broker-does-not-receive-data-and-no-generate-debug-message/10744/10 "2019-05-02T12:03:36Z")

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![TOPOLOGY](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/2X/6/6d856946bc57542f1bc20a0013d73a8e18a1ea7d.jpeg)

I think problem around virtualization or network. It's tired me ☹

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**Author:** ![bakman2](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/bakman2/32/6207_2.png) [@bakman2](https://discourse.nodered.org/u/bakman2)\
**Post date:** [2 May 2019 12:44 UTC](https://discourse.nodered.org/t/mqtt-broker-does-not-receive-data-and-no-generate-debug-message/10744/11 "2019-05-02T12:44:30Z")

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`iotgateway/#`

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<div class="post-metadata">

**Author:** ![muharremsari](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/muharremsari/32/7996_2.png) [@muharremsari](https://discourse.nodered.org/u/muharremsari)\
**Post date:** [2 May 2019 13:45 UTC](https://discourse.nodered.org/t/mqtt-broker-does-not-receive-data-and-no-generate-debug-message/10744/12 "2019-05-02T13:45:42Z")

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> [@bakman2](#):
>
> iotgateway/#

I tried , but still not working ☹

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<div class="post-metadata">

**Author:** ![ukmoose](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/ukmoose/32/13_2.png) [@ukmoose](https://discourse.nodered.org/u/ukmoose)\
**Post date:** [2 May 2019 13:58 UTC](https://discourse.nodered.org/t/mqtt-broker-does-not-receive-data-and-no-generate-debug-message/10744/13 "2019-05-02T13:58:00Z")

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so if you think it’s a network issue you need to try a different MQTT client on the SAME machine as Node-RED and try to subscribe to a topic.

If you can’t then it’s not a Node-RED issue

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<div class="post-metadata">

**Author:** ![muharremsari](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/muharremsari/32/7996_2.png) [@muharremsari](https://discourse.nodered.org/u/muharremsari)\
**Post date:** [3 May 2019 02:00 UTC](https://discourse.nodered.org/t/mqtt-broker-does-not-receive-data-and-no-generate-debug-message/10744/14 "2019-05-03T02:00:57Z")

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I was try this way for solution

Send message with MQTT.fx from broker machine to NR. I saw recive message debug.

 ![mqtt_test_to_node_red](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/2X/5/58f545375cba24a619c5ed67492e4dd573635d12.jpeg)

Ran broker application on the simulation mode. Watched the log windowd. Was get "no suitable 32-bit JRE was configured or found"

 ![mqtt_java_error](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/2X/a/afaf60026ae49c4aa34df86c8a53c3a8ff848fcf.jpeg)

Install java broker machine

Problem solved.

 ![mqtt_is_ok](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/2X/b/b4990f4a30af9d1e768f71dd1c2400551bc8fc49.jpeg)

Thanks all! for support.