Example use of the MQTT protocol in KasperskyOS.
In this example, an MQTT publisher must be started on the host operating system, and an MQTT subscriber must be started on KasperskyOS. The Subscriber
program is an implementation of an MQTT subscriber.
When the example starts and runs successfully, an MQTT subscriber started on KasperskyOS prints a "Got message with topic: my/awesome/topic, payload: hello"
message.
The example also demonstrates the use of various virtual file systems (VFS) in a single solution:
VfsNet
program is used for working with the network.VfsSdCardFs
program is used to work with the file system.The CMake system, which is included with KasperskyOS Community Edition, is used to build and run the example.
Starting Mosquitto
To run this example, a Mosquitto MQTT broker must be installed and started on the host system. To install and start Mosquitto, run the following commands:
$ sudo apt install mosquitto mosquitto-clients
$ sudo /etc/init.d/mosquitto start
To start an MQTT publisher on the host system, run the following command:
$ mosquitto_pub -t "my/awesome/topic" -m "hello"
Supplied resources
./resources/edl
contains the Subscriber.edl
file, which contains a static description of the Subscriber
program../resources/hdd/etc
contains the configuration files for the VfsNet
, Dhcpcd
and Ntpd
programs: hosts
, dhcpcd.conf
and ntp.conf
, respectively.Example files
The code of the example and build scripts are available at the following path:
/opt/KasperskyOS-Community-Edition-<version>/examples/mqtt_subscriber
Building and running example
See Building and running examples section.
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