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An opinionated library for writing MQTT services

Project description

# llama

An opinionated library for writing services on a MQTT message bus.

## Why?

Something along the lines of: After implementing [DaliQTT](
I wanted something more generalized to create new services more

Also see [Alpaca](, the Go implementation
of this library.

## How to use

Creating a new service in your network
is now as easy as:


# Connect to MQTT broker and start dispatch loop
dispatch, receive = mqtt.connect("localhost:1883", {
"strings": "v1/simple/strings",

handle(dispatch, receive())


With a handler like

def handle(dispatch, actions):
"""Process incoming actions"""

for action in actions:
if action["type"] == REVERSE_REQUEST:


The `receive` function can be used in a blocking and non-blocking
fashion by passing a `timeout` in seconds (e.g. `receive(timeout=0.25)`
and it can be used in a one shot kind of way, by passing `once=True`.

This way `receive(once=True)` will block until an action is received,
or (if specified) the `timeout` will occure.

### Error handling

In case decoding the MQTT payload failed, an `llama.actions.MESSAGE_DECODE_ERROR_RESULT`
is received.

### Example

For a simple working example please checkout the [examples/reverser/]( string reversal service.

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