========== Microhomie

|build-status|

Microhomie is a MicroPython framework for Homie <https://github.com/homieiot/convention>_, a lightweight MQTT convention for the IoT. Main target for Microhomie is the ESP8266 device and has been well tested and used on ESP32.

Microhomie v3 implements Homie v4.0.0 <https://github.com/homieiot/convention/releases/tag/v4.0.0>_.

Read the Microhomie documentation <https://microhomie.readthedocs.io>_ to get started.

Learn from our examples until we have a "howto build nodes" section in the documentation or join the #microhomie channel on the MicroPython Slack community <https://slack-micropython.herokuapp.com/>_ and chat with us.

Binaries can be verified with minisign <https://jedisct1.github.io/minisign/>_ and the following public key:

.. code-block::

RWTwPeRvouNzP+mcL1t7QDTnKz96i3Kuf95fjpE28szMq8OTycMmiTzX

Update from v2

Microhomie v3 has some breaking changes you should be aware of before update.

• Microhomie v3 only supports the new LFS2 filesystem. For update you must erase and reflash your device.
• You may need to update your asyncio coroutines as of the new Micropython asyncio v3. Peter Hinch's has a great asyncio v3 update guide <https://github.com/peterhinch/micropython-async/blob/master/v3/README.md>_
• New asyncio V3 primitives from Peter Hinch micropython-async <https://github.com/peterhinch/micropython-async>_ for switch and pushbutton.
• The utils module was refactored to homie.network.

MicroPython changes

• btree and vfat support disabled to save some space
• AccessPoint SSID changed to Microhomie-MAC with the secret microhomiE
• inisetup.py writes a custom boot.py

Install

Download the latest image <https://github.com/microhomie/microhomie/releases>_ and flash it like any MicroPython image to your ESP8266 device. I.E:

.. code-block:: shell

esptool --port PORT --baud 460800 write_flash --flash_size=detect --verify -fm dio 0x0 microhomie-esp8266-VERSION.bin

Make your changes in settings.example.py and copy this file as settings.py to your device. You can now test our example nodes from examples/, just copy the main.py to your device. Start with the examples/led node to turn on and off the on-board LED.

Example

This is a basic example to power the on-board LED from an ESP8266 development board:

.. code-block:: python

import settings

from machine import Pin

from homie.node import HomieNode
from homie.device import HomieDevice
from homie.property import HomieProperty
from homie.constants import BOOLEAN, FALSE, TRUE


# Reversed values map for the esp8266 boards on-board LED
ONOFF = {FALSE: 1, TRUE: 0}


# Initialize the pin for the onboard LED
LED = Pin(2, Pin.OUT, value=1)


# The on_message handler to power the led
def toggle_led(topic, payload, retained):
    LED(ONOFF[payload])


def main():
    # Initialize the Homie device
    device = HomieDevice(settings)

    # Initialize the Homie node for the on-board LED
    led_node = HomieNode(id="led", name="On-board LED", type="LED",)

    # Initialize the Homie property to power on/off the led
    led_power = HomieProperty(
        id="power",
        name="Power",
        settable=True,
        datatype=BOOLEAN,
        default=FALSE,
        on_message=toggle_led,
    )

    # Add the power property to the node
    led_node.add_property(led_power)

    # Add the led node to the device
    device.add_node(led_node)

    # Run
    device.run_forever()


if __name__ == "__main__":
    main()

Build esp8266 image

To build your own Microhomie image for the ESP8266 device, run:

.. code-block:: shell

make bootstrap
make
make deploy PORT=/dev/ttyUSBX

Known issues

• No SSL support for now

.. |build-status| image:: https://readthedocs.org/projects/microhomie/badge/?version=master :target: http://microhomie.readthedocs.io/en/master/?badge=master :alt: Documentation Status

Included libraries

• mqtt_as.py <https://github.com/peterhinch/micropython-mqtt> by Peter Hinch but we use the patched version <https://github.com/kevinkk525/micropython-mqtt> from Kevin Köck. Kevins version has support for a keyword based configuration and unsubscribe.
• asyncio V3 primitives from Peter Hinch micropython-async <https://github.com/peterhinch/micropython-async/tree/master/v3>_ repository.