sniffs 0.5.4

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Sniffs - Python MQTT Router

Sniffs is a lightweight Python package for routing MQTT messages using flexible topic patterns. It provides an easy-to-use interface for defining routes and handling incoming messages efficiently.

Features

• Define routes with dynamic topic patterns
• Support for named and unnamed placeholders in topic patterns
• Integration with MQTT clients for seamless message routing

Installation

You can install Sniffs via pip:

pip install sniffs

Usage

import paho.mqtt.client as mqtt
import ssl
from sniffs import Sniffs

app = Sniffs()

@app.route("<key>:{option_1,option_2}/log")
def incredibly_broad_route(key, topic, message):
    print(f"key: {key}")
    print(f"topic: {topic}")
    print(f"message: {message}")

client = mqtt.Client(mqtt.CallbackAPIVersion.VERSION2, client_id="client123")
client.username_pw_set("username", "password")
client.tls_set(cert_reqs=ssl.CERT_NONE)
client.connect(
    host="host",
    port=9937,
)

app.bind(client)

client.loop_forever()

Documentation

Named Placeholders

Placeholders can be used in your routes. For example, room here is used as a placeholder and the argument name is injected into the function arguments:

@app.route("<room>:{living_room,kitchen}/temperature")
def receive_temperature_data(room):
    if room == "living_room":
        # do something
    elif room == "kitchen":
        # do something else

Argument injection works by looking up the name of the placeholder, so using a different name is the arguments will not work:

# DOES NOT WORK, DO NOT DO THIS!!!
@app.route("<room>:{living_room,kitchen}/temperature")
def receive_temperature_data(argument_one):
    ...

Wildcard Placeholders

If you want to match on anything, you can create a wildcard placeholder by not specifying any placeholder options. This example effectively matches on the topic of +/temperature:

@app.route("<room>/temperature")
def receive_temperature_data(room):
    ...

You can use any number of named and wildcard placeholders together:

@app.route("<room>/<sensor>:{sensor_1,sensor_2}/<sensor_type>{temperature,humidity}")
def receive_temperature_data(room, sensor, sensor_type):
    ...

topic and message

The topic and message arguments are injected, sort of like pytest fixtures. Do not use them as your keys in your routes, as they are reserved.

topic - The topic on which the message was received. This will be the actual topic name, not the templated route. For instance, a route for <room>:{living_room,kitchen}/temperature will always have a topic that is one of the following: living_room/temperature, kitchen/temperature. This maps to the on_message function from paho mqtt client, with the value of msg.topic.

message - This maps to the on_message function, with the value of msg.payload.

@app.route("<room>:{living_room,kitchen}/temperature")
def receive_temperature_data(room, topic, message):
    ...

The arguments are optional, they do not need to be included in your arguments:

@app.route("<room>:{living_room,kitchen}/temperature")
def receive_temperature_data(room):
    ...

Contributing

Contributions are welcome! Please feel free to open issues or submit pull requests.

License

This project is licensed under the MIT License - see the LICENSE file for details.