kandi X-RAY | mosquitto Summary
kandi X-RAY | mosquitto Summary
Mosquitto is an open source implementation of a server for version 5.0, 3.1.1, and 3.1 of the MQTT protocol. It also includes a C and C++ client library, and the mosquitto_pub and mosquitto_sub utilities for publishing and subscribing.
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mosquitto Key Features
mosquitto Examples and Code Snippets
Trending Discussions on mosquitto
I am trying to set remote_client ID using a value from the system environment variables instead of hardcoding it in the mosquitto.conf configuration file.
Is it possible to pass it inline when starting mosquitto such as:...
ANSWERAnswered 2021-Aug-19 at 20:23
I believe that the only way to do this currently is to programmatically edit
mosquitto.conf (this project uses that approach to allow support for configuration via environment variables in docker).
There is no command line option to set
remote_clientid and environment variables are not supported in the
mosquitto.conf (but this may change - see this feature request).
i've installed mqtt at my router and uses WEB UI to control this. here are some lines that i added into mosquitto.conf...
ANSWERAnswered 2022-Jan-05 at 08:49
service is not executeable, instead of using
service, i just executed mosquitto via mosquitto command.
I recently saw a post which had some code I wanted to try. But am noticing an error which I can't debug.link The error is the code doesn't receive messages from topics it subscribes to.
The adapted code looks like this:...
ANSWERAnswered 2021-Dec-23 at 07:28
The code you've posted is not complete (missing closing
} from your publish function) and you haven't shown were you are calling that function.
You also haven't followed the instructions in the answer to the question you took the code from, which clearly states that you should be calling
client.subscribe(topic) in the on
I made a script to connect my linux CentOS VM as a client to my mosquitto MQTT broker. Just trying to connect at the moment using SSL. To publish and subscribe the broker requires username and password. But when I run the script using:
I am just getting the message below, and the cursor sits in a blank space for approx 1.5 minutes before execution is finished and a new command can be entered. I see the depreciation notice but it doesn't appear to be a problem yet. Also I have verified the 8883 port is open on the broker and its set-up so I believe the issue is with the client and its code....
ANSWERAnswered 2021-Dec-21 at 19:13
client.connected won't return
true until after the on
connect event handler has been completed.
Add a call to
client.subscribe() to the on
connect event handler so you actually have some messages to trigger the on
message event handler
I have a simple react app using mqtt-react-hooks and redux. I want to update my redux store each time a new message is received by a Subscriber.
ANSWERAnswered 2021-Dec-14 at 22:23
It looks like there is a sequence of things happening that is causing
Connector to rerender and drop the connection, here's what I think is going on:
Appis subscribing to store state, causing it to rerender every time a new message is received.
- You're recreating your mqtt config object every time
Apprenders, because you're passing an object literal
- In Connector.tsx line 48, the
mqttConnectcallback depends on the mqtt options object. React does a referential equality check, sees the options have changed, and causes the callback to be recreated.
- In Connector.tsx line 59, this causes the useEffect to rerun because the callback changed, which calls its teardown function, which ends the mqtt connection.
To fix it, you should create your MQTT options outside of
App so that they don't change.
I'm running an MQTT server mosquitto version 2.0.11 on the same Raspberry Pi Bullseye (3 A+) as both broker and client. I had code working, but understand that one needs to modify a .conf file to get things working. I must still not be understanding something because here's my file:...
ANSWERAnswered 2021-Nov-20 at 16:32
Firstly the errors about not being able to open the pid or log files are because you are running mosquitto as a normal user (probably pi). This user does not have permission to read/write to file in
/var/log hence the failure when you try and run it "manually".
You've not said how you installed 2.0.11, as the default version bundled with Bullseys is still a 1.5.x build. Assuming you used the mosquitto.org repository then the mosquitto service will have been installed and configured. It will automatically pick up the default config file at
/etc/mosquitto/mosquitto.conf as should be displayed with:
I've installed mosquito v2.0.11 on raspberry Pi3. I've written configuration file, allowing anonymous connections, but mosquitto seems to not load this configuration.
ANSWERAnswered 2021-Nov-14 at 16:20
Mosquitto does not automatically load a configuration file, you must pass it one on the command line with the
-c flag if you want to use anything other than the default values. When run as a service the service definition include the
-c pointing to the default configuration file.
The default configuration file is normally stored in
/etc/mosquitto/mosquitto.conf. This file includes the following line:
I use sp-react-native-mqtt for my project, and I would want to publish a message to a mqtt topic when a button is pressed.
Mqtt connect code, which returns a promise:...
ANSWERAnswered 2021-Nov-11 at 18:31
So after all, @hardillb answer helped me.
At first it didnt send the message even if I saved the client in a variable because I saved it before the client was connected.
When I use mosquitto to establish a TLS connection with my client program on a router, it doesn't work.
Here is the error log:...
ANSWERAnswered 2021-Oct-27 at 13:02
From the docs:
An optional array of null-terminated strings specifying the servers to which the client will connect. Each string takes the form protocol://host:port. protocol must be tcp or ssl. For host, you can specify either an IP address or a host name. For instance, to connect to a server running on the local machines with the default MQTT port, specify tcp://localhost:1883. If this list is empty (the default), the server URI specified on MQTTClient_create() is used.
Make sure your URL starts with
ssl:// not just an IP address and port.
I get this error when trying to run mosquitto docker on ubuntu.
docker: Error response from daemon: source /var/lib/docker/overlay2/a9ce020a555f57/merged/mosquitto/config/mosquitto.conf is not directory.
I'm running this command.
sudo docker run -it -p 1883:1883 -p 9001:9001 -v mosquitto.conf:/mosquitto/config/mosquitto.conf eclipse-mosquitto...
ANSWERAnswered 2021-Oct-02 at 00:17
From the docker docs
When you use a bind mount, a file or directory on the host machine is mounted into a container. The file or directory is referenced by its absolute path on the host machine.
No vulnerabilities reported
c-ares (libc-ares-dev on Debian based systems) - only when compiled with make WITH_SRV=yes. cJSON - for client JSON output support. Disable with make WITH_CJSON=no Auto detected with CMake. libwebsockets (libwebsockets-dev) - enable with make WITH_WEBSOCKETS=yes. openssl (libssl-dev on Debian based systems) - disable with make WITH_TLS=no. pthreads - for client library thread support. This is required to support the mosquitto_loop_start() and mosquitto_loop_stop() functions. If compiled without pthread support, the library isn’t guaranteed to be thread safe. uthash / utlist - bundled versions of these headers are provided, disable their use with make WITH_BUNDLED_DEPS=no. xsltproc (xsltproc and docbook-xsl on Debian based systems) - only needed when building from git sources - disable with make WITH_DOCS=no. Equivalent options for enabling/disabling features are available when using the CMake build.
c-ares (libc-ares-dev on Debian based systems) - only when compiled with make WITH_SRV=yes
cJSON - for client JSON output support. Disable with make WITH_CJSON=no Auto detected with CMake.
libwebsockets (libwebsockets-dev) - enable with make WITH_WEBSOCKETS=yes
openssl (libssl-dev on Debian based systems) - disable with make WITH_TLS=no
pthreads - for client library thread support. This is required to support the mosquitto_loop_start() and mosquitto_loop_stop() functions. If compiled without pthread support, the library isn’t guaranteed to be thread safe.
uthash / utlist - bundled versions of these headers are provided, disable their use with make WITH_BUNDLED_DEPS=no
xsltproc (xsltproc and docbook-xsl on Debian based systems) - only needed when building from git sources - disable with make WITH_DOCS=no
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