podman: Create a mosquitto server and connect from container's python script

mosquitto.md

MOSQUITTO SERVER

1. install mosquitto

apt-get install mosquitto mosquitto-clients

2. add config to create server

echo "allow_anonymous true"  >  /etc/mosquitto/conf.d/nework.conf
echo "listener 1883 0.0.0.0" >> /etc/mosquitto/conf.d/nework.conf

3. restart mosquito daemon

/etc/init.d/mosquitto restart

4. mosquitto subscribe: obtain messages

mosquitto_sub -t test --insecure

5. mosquitto publish: send messages to subscriptors

mosquitto_pub -h localhost -t test -m "Hello, MQTT!"

PODMAN

1. get my ip, in my case: 10.217.252.10

ip addr show

2. create folder

mkdir -p /home/projects/pdm-python
cd /home/projects/pdm-python

3. create script

nano index.py

import paho.mqtt.client as mqtt

print("Mosquito client:")

def on_connect(client, userdata, flags, rc):
    print(f"Connected with result code {rc}")
    client.subscribe("test")

def on_message(client, userdata, msg):
    print(f"{msg.topic}: {msg.payload.decode()}")

client = mqtt.Client()

client.on_connect = on_connect
client.on_message = on_message

client.connect("10.217.252.83", 1883, 60)

client.loop_forever()

4. build image

 podman build pdm-python .

5. create network

podman network create localdomain

6. run image

podman run --network=localdomain -ti pdm-python

7. send message to mosquito server and check in the podman container

mosquitto_pub -h localhost -t test -m "Hello, MQTT!"

8. podman container response:

test: Hello, MQTT!