pydevlpr 0.3.1

Frontend for connecting to devlprd and processing data from a FANTM DEVLPR

pydevlpr

Overview

Enables simple muscle to application connections. Pydevlpr is the front-end for devlprd <https://github.com/FANTM/devlprd>_, and the third piece of the muscle-to-app pipeline.

Getting Started

After installing pydevlpr, integrating it into a project is straightforward. First launch the devlprd daemon <https://github.com/FANTM/devlprd>_, and then use the add_callback(...) function to attach a handler to the incoming data. The callback you attach will get the incoming payload as its only parameter, and then the data is yours to handle.

Supported Topics

This list will expand as the package matures, but when adding/removing callbacks use a data topic from this list as it maps directly to the daemon.

• DataTopic.RAW_DATA_TOPIC - Data straight off the DEVLPR Arduino Shield. Range: 0-1023.
• DataTopic.FLEX_TOPIC - 1 when there has been a flex, 0 when muscle is relaxed.

API

def stop() -> None:

Stops listening to the server.

def add_callback(topic: str, pin: int, fn: Callable[[str], None], ws: websocket.server.WebSocketServerProtocol = None) -> None:

Attaches a function to be called whenever a message is received at a particular topic and relating to a particular DEVLPR (as specified by the pin parameter).

• topic: str - Specifies the data stream, differentiating filtered vs. raw data.

• pin: int - Connects the callback to a physical board. Each DEVLPR is connection to the Arduino via an analog pin, and the message from the daemon relates which pin this is.
• fn: Callable[[str], None] - Function to be called when a message is received that is both the specified topic and pin. It expects to receive the payload of the incoming message.
• ws: websocket.server.WebSocketServerProtocol - Websocket connection, by default set to None and uses pydevlprs global connection. Pass a connection in if it is going to be used in another context, or for testing.

def remove_callback(topic: str, pin: int, fn: Callable[[str], None]) -> None:

Stops a function from being called whenever a new qualified packet is received.

• topic: str - The data stream the existing callback is attached to.

• pin: int - The DEVLPR the callback is attached to.
• fn: Callable[[str], None] - Function to remove from the callback list.