Noggin: A very simple web server for MicroPython

Installation

You need to get the noggin directory onto your MicroPython board. I use the ampy command for this:

ampy -p /dev/ttyUSB0 -b 115200 put noggin

There is a Makefile in the repository that will compile all the Python to byte code and then install it on your board, but it relies on a patched version of ampy so I don't recommend you use it at this time.

Overview

Working with Noggin is very simple. Start by importing a few things from the module:

from noggin import Noggin, Response, HTTPError

Create a new Noggin instance:

app = Noggin()

Define some functions and map them to request paths. Your function may return a text value to send that text to the client:

@app.route('/device/([^/]+)/([^/]+)')
def device_info(req, dev_type, dev_id):
    return 'You asked about device type {}, device id {}'.format(
        dev_type, dev_id)

Or you can return a dictionary or list to return JSON to the cilent:

@app.route('/device/([^/]+)/([^/]+)')
def device_info(req, dev_type, dev_id):
    return {'dev_type': dev_type, 'dev_id': dev_id'}

To run your app, call the serve method. You may optionally provide a port:

app.serve(port=8080)

Use the HTTPError exception to return errors to the client:

@app.route('/value/(.*)')
def get_value(req, sensor):
    if sensor not in active_sensors:
        raise HTTPError(404)

Use the Response class if you want to set the returned content type or other headers:

@app.route('/')
def index(req):
    return Response('<strong>This</strong> is a test',
                    content_type='text/html')

Examples

The demo app

Install the demo app. I like to use ampy:

ampy -p /dev/ttyUSB0 -b 115200 put examples/demo.py demo.py

Now you can run the demo. On your MicroPython board, import the example application:

>>> import demo
>>> demo.app.serve()

This will start a web server on port 80. See the docstrings in the source for more information about available request methods.

The fileops app

The fileops app implements a simple web interface to the filesystem. It supports the following requests:

• GET /disk -- get information about the filesystem
• GET /disk/free -- get available free space (in blocks and bytes)
• GET /file -- get a list of files
• PUT /file/<path> -- write a file to the filesystem
• POST /file/<path> -- rename a file (new filename is POST body)
• DELETE /file/<path> -- delete a file
• GET /reset -- execute machine.reset()

To install the fileops app:

ampy -p /dev/ttyUSB0 -b 115200 put examples/fileops.py fileops.py

To run the fileops app:

>>> import fileops
>>> fileops.app.serve()