Module lib.sample.mqttsample

Sample of mqtt client. Support MQTT 3.11

# Distributed under Pycameresp License
# Copyright (c) 2023 Remi BERTHOLET
# pylint:disable=consider-using-f-string
""" Sample of mqtt client. Support MQTT 3.11 """
import server.mqttclient
import tools.strings

@server.mqttclient.MqttClient.add_topic(topic='testtopic')
async def on_topic(message, **kwargs):
        """ Example of the mqtt subscription

        to test publish : 
                mosquitto_pub -h $BROKER -p 1883 -t testtopic -u username -P password -q 2 -m "my test topic" """
        print("on_topic called  %s"%tools.strings.tostrings(message.value))

@server.mqttclient.MqttClient.add_topic(topic='forward_message')
async def on_forward_message(message, **kwargs):
        """ Example of the mqtt subscription with emission of a message

        to test subscribe :
                mosquitto_sub -h $BROKER -p 1883 -t receive_message -u username -P password

        to test publish :
                mosquitto_pub -h $BROKER -p 1883 -t forward_message -u username -P password -q 2 -m "Hello world" """
        print("on_forward_message  %s"%tools.strings.tostrings(message.value))
        await server.mqttclient.MqttClient.publish(topic="receive_message", value=message.value)

@server.mqttclient.MqttClient.add_topic(topic='command')
async def on_command(message, **kwargs):
        """ Example of to test dynamic subscribe, unsubscribe
        to test dynamic subscribe :
                mosquitto_pub -h $BROKER -p 1883 -t command -u username -P password -m "subscribe test"
        
        to test dynamic unsubscribe :
                mosquitto_pub -h $BROKER -p 1883 -t command -u username -P password -m "unsubscribe test"

        to test publish reception :
                mosquitto_pub -h $BROKER -p 1883 -t test -u username -P password -m "hello world"
        """
        async def on_test(message, **kwargs):
                print("On test called with message=",message.value)

        command, param = tools.strings.tostrings(message.value).split(" ")
        if command =="subscribe":
                await server.mqttclient.MqttClient.subscribe(topic=param, callback=on_test)
        elif command == "unsubscribe":
                await server.mqttclient.MqttClient.unsubscribe(topic=param)

Functions

async def on_command(message, **kwargs)

Example of to test dynamic subscribe, unsubscribe to test dynamic subscribe : mosquitto_pub -h $BROKER -p 1883 -t command -u username -P password -m "subscribe test"

to test dynamic unsubscribe : mosquitto_pub -h $BROKER -p 1883 -t command -u username -P password -m "unsubscribe test"

to test publish reception : mosquitto_pub -h $BROKER -p 1883 -t test -u username -P password -m "hello world"

Expand source code

@server.mqttclient.MqttClient.add_topic(topic='command')
async def on_command(message, **kwargs):
        """ Example of to test dynamic subscribe, unsubscribe
        to test dynamic subscribe :
                mosquitto_pub -h $BROKER -p 1883 -t command -u username -P password -m "subscribe test"
        
        to test dynamic unsubscribe :
                mosquitto_pub -h $BROKER -p 1883 -t command -u username -P password -m "unsubscribe test"

        to test publish reception :
                mosquitto_pub -h $BROKER -p 1883 -t test -u username -P password -m "hello world"
        """
        async def on_test(message, **kwargs):
                print("On test called with message=",message.value)

        command, param = tools.strings.tostrings(message.value).split(" ")
        if command =="subscribe":
                await server.mqttclient.MqttClient.subscribe(topic=param, callback=on_test)
        elif command == "unsubscribe":
                await server.mqttclient.MqttClient.unsubscribe(topic=param)

async def on_forward_message(message, **kwargs)

Example of the mqtt subscription with emission of a message

to test subscribe : mosquitto_sub -h $BROKER -p 1883 -t receive_message -u username -P password

to test publish : mosquitto_pub -h $BROKER -p 1883 -t forward_message -u username -P password -q 2 -m "Hello world"

Expand source code

@server.mqttclient.MqttClient.add_topic(topic='forward_message')
async def on_forward_message(message, **kwargs):
        """ Example of the mqtt subscription with emission of a message

        to test subscribe :
                mosquitto_sub -h $BROKER -p 1883 -t receive_message -u username -P password

        to test publish :
                mosquitto_pub -h $BROKER -p 1883 -t forward_message -u username -P password -q 2 -m "Hello world" """
        print("on_forward_message  %s"%tools.strings.tostrings(message.value))
        await server.mqttclient.MqttClient.publish(topic="receive_message", value=message.value)

async def on_topic(message, **kwargs)

Example of the mqtt subscription

to test publish : mosquitto_pub -h $BROKER -p 1883 -t testtopic -u username -P password -q 2 -m "my test topic"

Expand source code

@server.mqttclient.MqttClient.add_topic(topic='testtopic')
async def on_topic(message, **kwargs):
        """ Example of the mqtt subscription

        to test publish : 
                mosquitto_pub -h $BROKER -p 1883 -t testtopic -u username -P password -q 2 -m "my test topic" """
        print("on_topic called  %s"%tools.strings.tostrings(message.value))