mqttclient | php mqtt client

I am using the paho.mqtt.golang library to connect to a broker and publish message.

It's working fine except that I don't have errors when the publish failed.

The test I'm doing is as follow:

• I start the broker
• I run my code to connect to the broker. After connection the code waits for an input to proceed to publish
• I kill the broker
• I press enter to proceed to publish the message

I would expect an error with the token returned by the publish function if token.Error() != nil {...} but I got none.

Here is the code of the publish function:

I want to use the mac address of my system as a topic name.

I want something like : project/00:1B:44:11:3A:B7/temperature/status

I tried in this way:

"Connection to the database terminated. This can happen due to network instabilities, or due to restarts of the database." But my Neo4j DB is online and can be reached - Also in the shown logs there is not indication that the connection is the issue...

Neo4j Version: 4.2.5 Edition: community

Structr Version: 3.6.4

What did I miss? (Changed the default neo4j password and can create nodes in the Neo4j Browser)

Have a look on the Logfile output here:

Thank you some hints would be awesome :-)

I have a ESP32 device sending data at a very fast rate using umqtt module. Also, a Mosquitto broker listening on ports 1883 for mqtt and 9001 for websockets. Finally, a react App showing messages in real-time.

The problem is that every time the React App receives a message from the ESP device, a new TCP connection is established, resulting in a lot of opened connections, as you can see here:

I am currently trying to create a streaming DataSource plugin for Grafana. To do this, I have adapted the code from the official instructions so that data from an MQTT Topic is passed to Grafana. Here is the official working demo code with a timed output of the frame:

I created a small mqtt application using eclipse paho mqtt library in kotlin with Gradle in Intellij IDE. it runs fine when running it through Intellij but when I build it and run the jar file that gets created I get a NoClassDefFoundError error.

From other questions I have seen about this it looks like it has something to do with the class path but I am not sure what needs to be done if that is indeed the issue because I am using gradle and not jar files for libraries.

I was following this tutorial

Here is my gradle file

I created a hiveMQ cluster in the HiveMq cloud and created a username and password.

From Paho C library I created MQTTClient_connectOptions and put my username and password as parameters:

idk why, but I can't read a return value of a QString method from .cpp-code in .qml-code, although I did everything logically correct (I'll put only relatable parts of code):

.h File:

I am trying to stub a exported function from a module, so that i can replace the return value and also check if the function has been called.

I already created a stub, the tests runs through, but somehow the stub doesn't get used in the function, and the stub doesn't get called once.

index.ts