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GNU GENERAL PUBLIC LICENSE
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the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.

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# Heart-Light
![Front View](img/front-view.jpg)
In this repo you can find the source for a [MicroPython](https://micropython.org/) based WS2812b-Project.
The microprozessor running it is the ESP32 (NodeMCU32S to be specific).
It also has a bmp280 termperature/pressure sensor and 2 pushbuttons for switching the animation.
Besides the buttons it can also be controlled via the MQTT.
It implements the [homie](https://homieiot.github.io/) convention (functionality provided by the [microhomie](https://github.com/microhomie/microhomie) library).
## Build and use
The case is made from cardboard and put together with loads of hot glue, which look ok, but you can 3D-Print something as well.
All LEDs are glued to the walls and the ESP32 on the back.
The light diffuser used on the picture is a acrylic sheet but i found white paper to work as well here.
If you have problems while building this and want help, feel free to open up an issue here :)
I use this with [OpenHAB](http://www.openhab.org/) and it works wonderfully.
## Flashing
Download the MicroPython [binary for the ESP32](https://micropython.org/download/esp32/).
On Linux it can be then be flashed via:
```
esptool.py --chip esp32 erase_flash ;
esptool.py --chip esp32 --port /dev/ttyUSB0 write_flash -z 0x1000 "$(find ~/ -name 'esp32*.bin' | head -n1)"
```
Edit the `settings.py` to your liking and put your wifi credentials (seperated by simple newlines) into a file called `wifi-credentials` on the root of the MicroPython filesystem.
Then upload all the `.py` files and the credentials with [rshell](https://github.com/dhylands/rshell) or [mpfshell](https://github.com/wendlers/mpfshell) for example.

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from homie.constants import FLOAT
from homie.property import HomieProperty
from update_homie_node import UpdateHomieNode
# from homie.device import await_ready_state
# import uasyncio as asyncio
# from time import ticks_ms, ticks_add, ticks_diff
class BMP280Node(UpdateHomieNode):
def __init__(
self,
id,
name,
bmp280,
interval=60*5):
super().__init__(id=id, name=name, type="sensor", interval=interval)
# BMP280
self.bmp280 = bmp280
self.property_temerature = HomieProperty(
id="temperature",
name="Temperatur",
datatype=FLOAT,
unit="°C",
)
self.add_property(self.property_temerature)
self.property_pressure = HomieProperty(
id="pressure",
name="Druck",
datatype=FLOAT,
unit="Pa",
)
self.add_property(self.property_pressure)
def update_data(self):
self.property_pressure.value = "{:1.0f}".format(
self.bmp280.pressure * 100) # hPa = 100 Pa
self.property_temerature.value = "{:1.2f}".format(
self.bmp280.temperature)

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# import webrepl
# webrepl.start()

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from math import sin, pi
def hsv2rgb(h, s, v):
if s == 0.0:
v *= 255
return (v, v, v)
i = int(h*6.) # XXX assume int() truncates!
f = (h*6.)-i
p, q, t = int(255*(v*(1.-s))), int(255*(v*(1.-s*f))
), int(255*(v*(1.-s*(1.-f))))
v *= 255
i %= 6
v, t, p, q = int(v), int(t), int(p), int(q)
if i == 0:
return (v, t, p)
if i == 1:
return (q, v, p)
if i == 2:
return (p, v, t)
if i == 3:
return (p, q, v)
if i == 4:
return (t, p, v)
if i == 5:
return (v, p, q)
class AnimHeartbeat:
name = "Heartbeat"
def __init__(self, leds):
pass
def render(self, leds, t, brightness=1):
t = t / 550.0
brightness *= 1.0 + 4.0 * sin(t + 1.5) * sin(t)**43.0
leds.fill((int(brightness * 255), 0, 0))
leds.write()
return 16
class AnimRegenbogen:
name = "Regenbogen"
def __init__(self, leds):
pass
def render(self, leds, t, brightness=1):
t = t / 2400.0
for i in range(leds.n):
leds[i] = hsv2rgb(i / leds.n + t, 1, brightness)
leds.write()
return 16
class AnimGanzeFarben:
name = "Ganze Farben"
def __init__(self, leds):
pass
def render(self, leds, t, brightness=1):
t = t / 40000.0
leds.fill(hsv2rgb(t, 1, brightness))
leds.write()
return 16
class AnimFarbverlauf:
name = "Farbverlauf"
def __init__(self, leds):
pass
def render(self, leds, t, brightness=1):
t = t / 1000.0
for i in range(leds.n):
leds[i] = hsv2rgb(t/60 + 0.3921 *
sin(i / leds.n * pi + t), 1, brightness)
leds.write()
return 16
class AnimHalbeHalbe:
name = "Halbe-Halbe"
def __init__(self, leds):
pass
def render(self, leds, t, brightness=1):
for i in range(leds.n):
offset = 0 if sin(float(i)/leds.n*pi*2-t/55234.0) > 0.0 else 0.5
leds[i] = hsv2rgb((t/60000.0 + offset) % 1, 1, brightness)
leds.write()
return 16
class AnimKnightRider:
name = "Knight Rider"
def __init__(self, leds):
pass
def render(self, leds, t, brightness=1):
t = t / 400.0
leds.fill((10, 10, 10))
leds[int(leds.n / 2 + sin(t) * leds.n / 3)] = (255, 0, 0)
leds.write()
return 90
class AnimStrobo:
name = "Stroboskop"
def __init__(self, leds):
self.on = True
pass
def render(self, leds, t, brightness=1):
leds.fill((255, 255, 255) if self.on else (0, 0, 0))
self.on = not self.on
leds.write()
return 10 if self.on else 40
class AnimLeselicht:
name = "Leselicht"
def __init__(self, leds):
self.on = True
pass
def render(self, leds, t, brightness=1):
b = int(brightness * 255)
leds.fill((b, b, b))
leds.write()
return 1000
ANIMS = [AnimHeartbeat,
AnimRegenbogen,
AnimGanzeFarben,
AnimFarbverlauf,
AnimHalbeHalbe,
AnimKnightRider,
AnimStrobo,
AnimLeselicht]

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import uasyncio as asyncio
from time import ticks_ms, ticks_add, ticks_diff
from homie.constants import BOOLEAN, TRUE, FALSE, FLOAT, ENUM, COLOR, RGB
from homie.property import HomieProperty
from homie.node import HomieNode
from machine import Pin
from primitives.pushbutton import Pushbutton
import gc
from led_anim import ANIMS
class LEDControlNode(HomieNode):
button_names = ("up", "down")
def __init__(self, id, name, pin_up, pin_down, leds):
super().__init__(id=id, name=name, type="colorlight")
pin_up.init(mode=Pin.IN, pull=Pin.PULL_UP)
pin_down.init(mode=Pin.IN, pull=Pin.PULL_UP)
button_up = Pushbutton(pin_up, suppress=True, sense=1)
button_down = Pushbutton(pin_down, suppress=True, sense=1)
self.buttons = (button_up, button_down)
self.on_buttons_pressed = [None, None]
self.on_buttons_released = [None, None]
self.leds = leds
self.properties_button_pressed = [None, None]
for i, button_name in enumerate(self.button_names):
self.properties_button_pressed[i] = HomieProperty(
id="button_{0}_pressed".format(button_name),
name="Knöpgen \"{0}\" gedrückt".format(button_name),
settable=True,
default=FALSE,
on_message=self._on_button_pressed_msg,
datatype=BOOLEAN,
)
self.add_property(self.properties_button_pressed[i])
self.buttons[i].press_func(self._on_buttons_pressed, args=(i,))
self.buttons[i].release_func(self._on_buttons_released, args=(i,))
self._power = False
self.property_power = HomieProperty(
id="power",
name="Power",
settable=True,
datatype=BOOLEAN,
default=FALSE,
on_message=self.on_power_msg,
)
self.add_property(self.property_power)
self.brightness = 0.7
self.property_brightness = HomieProperty(
id="brightness",
name="Helligkeit",
settable=True,
datatype=FLOAT,
default=70,
format="0:100",
unit="%",
on_message=self.on_brightness_msg,
)
self.add_property(self.property_brightness)
self.anims = dict([(a.name, (a, i+1)) for i, a in enumerate(ANIMS)])
self._animation_num = 0
self._animation = None
self.property_animation = HomieProperty(
id="animation",
name="Animation",
settable=True,
datatype=ENUM,
format=",".join(["-"]+list(self.anims.keys())),
default="-",
on_message=self.on_change_anim_msg,
)
self.add_property(self.property_animation)
self.color = (0, 0, 0)
self.property_color = HomieProperty(
id="color",
name="Solide Farbe",
settable=True,
datatype=COLOR,
format=RGB,
default="0,0,0",
on_message=self.on_change_color_msg,
)
self.add_property(self.property_color)
self.change = False
asyncio.create_task(self._update_data_async())
def on_power_msg(self, topic, payload, retained):
self.set_power(payload == TRUE)
self.change = True
def on_brightness_msg(self, topic, payload, retained):
self.brightness = (float(payload)/100.0*251.0 + 4)/255
self.change = True
def on_change_anim_msg(self, topic, payload, retained):
self.set_animation(payload)
def _on_button_pressed_msg(self, topic, payload, retained):
button_topic_name = topic.split("/")[-1].split("_")[1]
i = -1
for b, n in enumerate(self.button_names):
if n in button_topic_name:
i = b
break
if {FALSE: False, TRUE: True}[payload] and \
not self.buttons[i].rawstate():
self._on_buttons_pressed(i)
self._on_buttons_released(i)
def _on_buttons_pressed(self, i):
self.properties_button_pressed[i].value = TRUE
def _on_buttons_released(self, i):
self.properties_button_pressed[i].value = FALSE
self.set_animation_num((1 if i == 0 else -1) + self._animation_num)
async def _update_data_async(self):
while True:
if self._power:
if self._animation:
wait_next = self._animation.render(
leds=self.leds, t=ticks_ms(),
brightness=self.brightness)
if self.color != (0, 0, 0):
self.leds.fill(
tuple([int(self.brightness * float(i))
for i in self.color]))
self.leds.write()
wait_next = 10000
else:
wait_next = 10000
now = ticks_ms()
wait_till = ticks_add(now, wait_next)
while ticks_diff(wait_till, now) > 0 and not self.change:
await asyncio.sleep_ms(
min(100, ticks_diff(wait_till, now)))
now = ticks_ms()
self.change = False
def set_power(self, p):
self._power = p
self.property_power.value = TRUE if p else FALSE
if not p:
self.leds.fill((0, 0, 0))
self.leds.write()
def set_animation_num(self, p):
p = p % len(ANIMS)
if p == 0:
self.set_animation("")
else:
for a in self.anims.values():
if a[1] == p:
self.set_animation(a[0])
break
def on_change_color_msg(self, topic, payload, retained):
self.set_animation(tuple([int(i) for i in payload.split(",")]))
def set_animation(self, p):
if p in ANIMS:
self._animation = p
for a in self.anims.values():
if a[0] == self._animation:
self._animation = a[0](self.leds)
self._animation_num = a[1]
self.set_power(True)
break
if type(p) == str:
if p == "-" or p == "":
self.set_power(False)
self._animation_num = 0
self._animation = None
else:
self.set_power(True)
a = self.anims[p]
self._animation = a[0](self.leds)
self._animation_num = a[1]
if type(p) == tuple:
if max(p) == 0:
self.set_power(False)
else:
self.set_power(True)
self._animation_num = 0
self._animation = None
self.color = p
if self._animation:
self.color = (0, 0, 0)
self.property_color.value = str(self.color)[1:-1]
self.change = True
self.property_animation.value = self._animation.name if self._animation else "-"
gc.collect()

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# Updated 2018 and 2020
# This module is based on the below cited resources, which are all
# based on the documentation as provided in the Bosch Data Sheet and
# the sample implementation provided therein.
#
# Final Document: BST-BME280-DS002-15
#
# Authors: Paul Cunnane 2016, Peter Dahlebrg 2016
#
# This module borrows from the Adafruit BME280 Python library. Original
# Copyright notices are reproduced below.
#
# Those libraries were written for the Raspberry Pi. This modification is
# intended for the MicroPython and esp8266 boards.
#
# Copyright (c) 2014 Adafruit Industries
# Author: Tony DiCola
#
# Based on the BMP280 driver with BME280 changes provided by
# David J Taylor, Edinburgh (www.satsignal.eu)
#
# Based on Adafruit_I2C.py created by Kevin Townsend.
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
import time
from ustruct import unpack, unpack_from
from array import array
# BME280 default address.
BME280_I2CADDR = 0x76
# Operating Modes
BME280_OSAMPLE_1 = 1
BME280_OSAMPLE_2 = 2
BME280_OSAMPLE_4 = 3
BME280_OSAMPLE_8 = 4
BME280_OSAMPLE_16 = 5
BME280_REGISTER_CONTROL_HUM = 0xF2
BME280_REGISTER_STATUS = 0xF3
BME280_REGISTER_CONTROL = 0xF4
MODE_SLEEP = const(0)
MODE_FORCED = const(1)
MODE_NORMAL = const(3)
BME280_TIMEOUT = const(100) # about 1 second timeout
class BME280:
def __init__(self,
mode=BME280_OSAMPLE_8,
address=BME280_I2CADDR,
i2c=None,
**kwargs):
# Check that mode is valid.
if mode not in [BME280_OSAMPLE_1, BME280_OSAMPLE_2, BME280_OSAMPLE_4,
BME280_OSAMPLE_8, BME280_OSAMPLE_16]:
raise ValueError(
'Unexpected mode value {0}. Set mode to one of '
'BME280_OSAMPLE_1, BME280_OSAMPLE_2, BME280_OSAMPLE_4,'
'BME280_OSAMPLE_8, BME280_OSAMPLE_16'.format(mode))
self._mode = mode
self.address = address
if i2c is None:
raise ValueError('An I2C object is required.')
self.i2c = i2c
self.__sealevel = 101325
# load calibration data
dig_88_a1 = self.i2c.readfrom_mem(self.address, 0x88, 26)
dig_e1_e7 = self.i2c.readfrom_mem(self.address, 0xE1, 7)
self.dig_T1, self.dig_T2, self.dig_T3, self.dig_P1, \
self.dig_P2, self.dig_P3, self.dig_P4, self.dig_P5, \
self.dig_P6, self.dig_P7, self.dig_P8, self.dig_P9, \
_, self.dig_H1 = unpack("<HhhHhhhhhhhhBB", dig_88_a1)
self.dig_H2, self.dig_H3, self.dig_H4,\
self.dig_H5, self.dig_H6 = unpack("<hBbhb", dig_e1_e7)
# unfold H4, H5, keeping care of a potential sign
self.dig_H4 = (self.dig_H4 * 16) + (self.dig_H5 & 0xF)
self.dig_H5 //= 16
# temporary data holders which stay allocated
self._l1_barray = bytearray(1)
self._l8_barray = bytearray(8)
self._l3_resultarray = array("i", [0, 0, 0])
self._l1_barray[0] = self._mode << 5 | self._mode << 2 | MODE_SLEEP
self.i2c.writeto_mem(self.address, BME280_REGISTER_CONTROL,
self._l1_barray)
self.t_fine = 0
self.read_compensated_data()
def read_raw_data(self, result):
""" Reads the raw (uncompensated) data from the sensor.
Args:
result: array of length 3 or alike where the result will be
stored, in temperature, pressure, humidity order
Returns:
None
"""
self._l1_barray[0] = self._mode
self.i2c.writeto_mem(self.address, BME280_REGISTER_CONTROL_HUM,
self._l1_barray)
self._l1_barray[0] = self._mode << 5 | self._mode << 2 | MODE_FORCED
self.i2c.writeto_mem(self.address, BME280_REGISTER_CONTROL,
self._l1_barray)
# Wait for conversion to complete
for _ in range(BME280_TIMEOUT):
if self.i2c.readfrom_mem(self.address, BME280_REGISTER_STATUS, 1)[0] & 0x08:
time.sleep_ms(10) # still busy
else:
break # Sensor ready
else:
raise RuntimeError("Sensor BME280 not ready")
# burst readout from 0xF7 to 0xFE, recommended by datasheet
self.i2c.readfrom_mem_into(self.address, 0xF7, self._l8_barray)
readout = self._l8_barray
# pressure(0xF7): ((msb << 16) | (lsb << 8) | xlsb) >> 4
raw_press = ((readout[0] << 16) | (readout[1] << 8) | readout[2]) >> 4
# temperature(0xFA): ((msb << 16) | (lsb << 8) | xlsb) >> 4
raw_temp = ((readout[3] << 16) | (readout[4] << 8) | readout[5]) >> 4
# humidity(0xFD): (msb << 8) | lsb
raw_hum = (readout[6] << 8) | readout[7]
result[0] = raw_temp
result[1] = raw_press
result[2] = raw_hum
def read_compensated_data(self, result=None):
""" Reads the data from the sensor and returns the compensated data.
Args:
result: array of length 3 or alike where the result will be
stored, in temperature, pressure, humidity order. You may use
this to read out the sensor without allocating heap memory
Returns:
array with temperature, pressure, humidity. Will be the one
from the result parameter if not None
"""
self.read_raw_data(self._l3_resultarray)
raw_temp, raw_press, raw_hum = self._l3_resultarray
# temperature
var1 = (raw_temp/16384.0 - self.dig_T1/1024.0) * self.dig_T2
var2 = raw_temp/131072.0 - self.dig_T1/8192.0
var2 = var2 * var2 * self.dig_T3
self.t_fine = int(var1 + var2)
temp = (var1 + var2) / 5120.0
temp = max(-40, min(85, temp))
# pressure
var1 = (self.t_fine/2.0) - 64000.0
var2 = var1 * var1 * self.dig_P6 / 32768.0 + var1 * self.dig_P5 * 2.0
var2 = (var2 / 4.0) + (self.dig_P4 * 65536.0)
var1 = (self.dig_P3 * var1 * var1 / 524288.0 +
self.dig_P2 * var1) / 524288.0
var1 = (1.0 + var1 / 32768.0) * self.dig_P1
if (var1 == 0.0):
pressure = 30000 # avoid exception caused by division by zero
else:
p = ((1048576.0 - raw_press) - (var2 / 4096.0)) * 6250.0 / var1
var1 = self.dig_P9 * p * p / 2147483648.0
var2 = p * self.dig_P8 / 32768.0
pressure = p + (var1 + var2 + self.dig_P7) / 16.0
pressure = max(30000, min(110000, pressure))
# humidity
h = (self.t_fine - 76800.0)
h = ((raw_hum - (self.dig_H4 * 64.0 + self.dig_H5 / 16384.0 * h)) *
(self.dig_H2 / 65536.0 * (1.0 + self.dig_H6 / 67108864.0 * h *
(1.0 + self.dig_H3 / 67108864.0 * h))))
humidity = h * (1.0 - self.dig_H1 * h / 524288.0)
# humidity = max(0, min(100, humidity))
if result:
result[0] = temp
result[1] = pressure
result[2] = humidity
return result
return array("f", (temp, pressure, humidity))
@property
def sealevel(self):
return self.__sealevel
@sealevel.setter
def sealevel(self, value):
if 30000 < value < 120000: # just ensure some reasonable value
self.__sealevel = value
@property
def altitude(self):
'''
Altitude in m.
'''
from math import pow
try:
p = 44330 * (1.0 - pow(self.read_compensated_data()[1] /
self.__sealevel, 0.1903))
except:
p = 0.0
return p
@property
def dew_point(self):
"""
Compute the dew point temperature for the current Temperature
and Humidity measured pair
"""
from math import log
t, p, h = self.read_compensated_data()
h = (log(h, 10) - 2) / 0.4343 + (17.62 * t) / (243.12 + t)
return 243.12 * h / (17.62 - h)
@property
def values(self):
""" human readable values """
t, p, h = self.read_compensated_data()
return ("{:.2f}C".format(t), "{:.2f}hPa".format(p/100),
"{:.2f}%".format(h))
@property
def temperature(self):
""" float in °C """
t, _, _ = self.read_compensated_data()
return t
@property
def pressure(self):
""" float in hPa """
_, p, _ = self.read_compensated_data()
return p

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__version__ = "3.0.1"

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from micropython import const
# Device
QOS = const(1)
MAIN_DELAY = const(1000)
STATS_DELAY = const(60000)
WDT_DELAY = const(100)
# Device states
STATE_INIT = "init"
STATE_READY = "ready"
STATE_RECOVER = "recover"
STATE_OTA = "ota"
STATE_WEBREPL = "webrepl"
# Property datatypes
STRING = "string"
ENUM = "enum"
BOOLEAN = "boolean"
INTEGER = "integer"
FLOAT = "float"
COLOR = "color"
# Property formats
RGB = "rgb"
HSV = "hsv"
# (Sub)Topics
DEVICE_STATE = "$state"
T_BC = "$broadcast"
T_MPY = "$mpy"
T_SET = "/set"
# General
UTF8 = "utf-8"
SET = "set"
SLASH = "/"
UNDERSCORE = "_"
ON = "on"
OFF = "off"
TRUE = "true"
FALSE = "false"
LOCKED = "locked"
UNLOCKED = "unlocked"
# Build-in extension strings
EXT_MPY = "org.microhomie.mpy:0.1.0:[4.x]"
EXT_FW = "org.homie.legacy-firmware:0.1.1:[4.x]"
EXT_STATS = "org.homie.legacy-stats:0.1.1:[4.x]"

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import uasyncio as asyncio
from gc import collect, mem_free
from sys import platform
from homie import __version__
from homie.network import get_local_ip, get_local_mac
from homie.constants import (
DEVICE_STATE,
MAIN_DELAY,
QOS,
SLASH,
STATE_OTA,
STATE_INIT,
STATE_READY,
STATE_RECOVER,
STATE_WEBREPL,
T_BC,
T_MPY,
T_SET,
UNDERSCORE,
UTF8,
WDT_DELAY,
EXT_MPY,
EXT_FW,
EXT_STATS,
)
from machine import RTC, reset
from mqtt_as import LINUX, MQTTClient
from uasyncio import sleep_ms
from ubinascii import hexlify
from utime import time
from primitives import launch
from primitives.message import Message
def get_unique_id():
if LINUX is False:
from machine import unique_id
return hexlify(unique_id()).decode()
else:
raise NotImplementedError(
"Linux doesn't have a unique id. Provide the DEVICE_ID option in your settings.py."
)
# Decorator to block async tasks until the device is in "ready" state
_MESSAGE = Message()
def await_ready_state(func):
def new_gen(*args, **kwargs):
# fmt: off
await _MESSAGE
await func(*args, **kwargs)
# fmt: on
return new_gen
class HomieDevice:
"""MicroPython implementation of the Homie MQTT convention for IoT."""
def __init__(self, settings):
self.debug = getattr(settings, "DEBUG", False)
self._state = STATE_INIT
self._version = __version__
self._fw_name = "Microhomie"
self._extensions = getattr(settings, "EXTENSIONS", [])
self._bc_enabled = getattr(settings, "BROADCAST", False)
self._wifi = getattr(settings, "WIFI_CREDENTIALS", False)
self._wifi_rescan_delay = getattr(settings, "WIFI_RESCAN_DELAY", MAIN_DELAY)
self.first_start = True
self.stats_interval = getattr(settings, "DEVICE_STATS_INTERVAL", 60)
self.device_name = getattr(settings, "DEVICE_NAME", "")
self.callback_topics = {}
# Registered homie nodes
self.nodes = []
# Generate unique id if settings has no DEVICE_ID
self.device_id = getattr(settings, "DEVICE_ID", get_unique_id())
# Base topic
self.btopic = getattr(settings, "MQTT_BASE_TOPIC", "homie")
# Device base topic
self.dtopic = "{}/{}".format(self.btopic, self.device_id)
# mqtt_as client
self.mqtt = MQTTClient(
client_id=self.device_id,
server=settings.MQTT_BROKER,
port=getattr(settings, "MQTT_PORT", 1883),
user=getattr(settings, "MQTT_USERNAME", None),
password=getattr(settings, "MQTT_PASSWORD", None),
keepalive=getattr(settings, "MQTT_KEEPALIVE", 30),
ping_interval=getattr(settings, "MQTT_PING_INTERVAL", 0),
ssl=getattr(settings, "MQTT_SSL", False),
ssl_params=getattr(settings, "MQTT_SSL_PARAMS", {}),
response_time=getattr(settings, "MQTT_RESPONSE_TIME", 10),
clean_init=getattr(settings, "MQTT_CLEAN_INIT", True),
clean=getattr(settings, "MQTT_CLEAN", True),
max_repubs=getattr(settings, "MQTT_MAX_REPUBS", 4),
will=("{}/{}".format(self.dtopic, DEVICE_STATE), "lost", True, QOS),
subs_cb=self.subs_cb,
wifi_coro=None,
connect_coro=self.connection_handler,
ssid=getattr(settings, "WIFI_SSID", None),
wifi_pw=getattr(settings, "WIFI_PASSWORD", None),
)
def add_node(self, node):
node.device = self
node.set_topic() # set topic for node properties
_p = node.properties
for p in _p:
p.set_topic()
self.nodes.append(node)
def all_properties(self, func, tup_args):
""" Run method on all registered property objects """
_n = self.nodes
for n in _n:
_p = n.properties
for p in _p:
_f = getattr(p, func)
launch(_f, tup_args)
async def subscribe(self, topic):
self.dprint("MQTT SUBSCRIBE: {}".format(topic))
await self.mqtt.subscribe(topic, QOS)
async def unsubscribe(self, topic):
self.dprint("MQTT UNSUBSCRIBE: {}".format(topic))
await self.mqtt.unsubscribe(topic)
async def connection_handler(self, client):
"""subscribe to all registered device and node topics"""
if not self.first_start:
await self.publish("{}/{}".format(self.dtopic, DEVICE_STATE), STATE_RECOVER)
# Subscribe to Homie broadcast topic
if self._bc_enabled:
await self.subscribe("{}/{}/#".format(self.btopic, T_BC))
# Subscribe to the Micropython extension topic
if EXT_MPY in self._extensions:
await self.subscribe("{}/{}".format(self.dtopic, T_MPY))
# Subscribe to node property topics
self.all_properties("subscribe", ())
# on first connection:
# * publish device and node properties
# * enable WDT
# * run all coros
if self.first_start is True:
await self.publish_properties()
# Unsubscribe from retained topics that received no retained message
for t in self.callback_topics:
if not t.endswith(T_SET):
await self.unsubscribe(t)
del self.callback_topics[t]
# Activate watchdog timer
if not LINUX and not self.debug:
asyncio.create_task(self.wdt())
# Start all async tasks decorated with await_ready_state
_MESSAGE.set()
await sleep_ms(MAIN_DELAY)
_MESSAGE.clear()
# Do not run this if clause again on wifi/broker reconnect
self.first_start = False
# Publish data from all properties on first start
self.all_properties("publish", ())
# Announce that the device is ready
await self.publish("{}/{}".format(self.dtopic, DEVICE_STATE), STATE_READY)
def subs_cb(self, topic, payload, retained):
""" The main callback for all subscribed topics """
topic = topic.decode()
payload = payload.decode()
self.dprint(
"MQTT MESSAGE: {} --> {}, {}".format(topic, payload, retained)
)
# Only non-retained messages are allowed on /set topics
if retained and topic.endswith(T_SET):
return
# broadcast topic
if T_BC in topic:
self.broadcast_callback(topic, payload, retained)
# Micropython extension
elif topic.endswith(T_MPY) and EXT_MPY in self._extensions:
if payload == "reset":
asyncio.create_task(self.reset("reset"))
elif payload == "webrepl":
asyncio.create_task(self.reset("webrepl"))
elif payload == "yaota8266" and platform == "esp8266":
asyncio.create_task(self.reset("yaotaota"))
# All other topics
else:
if topic in self.callback_topics:
self.callback_topics[topic](topic, payload, retained)
async def publish(self, topic, payload, retain=True):
if isinstance(payload, int):
payload = str(payload).encode()
if isinstance(payload, str):
payload = payload.encode()
self.dprint("MQTT PUBLISH: {} --> {}".format(topic, payload))
await self.mqtt.publish(topic, payload, retain, QOS)
async def broadcast(self, payload, level=None):
if isinstance(payload, int):
payload = str(payload)
topic = "{}/{}".format(self.btopic, T_BC)
if level is not None:
topic = "{}/{}".format(topic, level)
self.dprint("MQTT BROADCAST: {} --> {}".format(topic, payload))
await self.mqtt.publish(topic, payload, retain=False, qos=QOS)
def broadcast_callback(self, topic, payload, retained):
""" Gets called when the broadcast topic receives a message """
pass
async def publish_properties(self):
""" Publish device and node properties """
_t = self.dtopic
publish = self.publish
# device properties
await publish("{}/$homie".format(_t), "4.0.0")
await publish("{}/$name".format(_t), self.device_name)
await publish("{}/{}".format(_t, DEVICE_STATE), STATE_INIT)
await publish("{}/$implementation".format(_t), bytes(platform, UTF8))
await publish(
"{}/$nodes".format(_t), ",".join([n.id for n in self.nodes])
)
# node properties
_n = self.nodes
for n in _n:
await n.publish_properties()
# extensions
await publish("{}/$extensions".format(_t), ",".join(self._extensions))
if EXT_FW in self._extensions:
await publish("{}/$localip".format(_t), get_local_ip())
await publish("{}/$mac".format(_t), get_local_mac())
await publish("{}/$fw/name".format(_t), self._fw_name)
await publish("{}/$fw/version".format(_t), self._version)
if EXT_STATS in self._extensions:
await self.publish("{}/$stats/interval".format(_t), str(self.stats_interval))
# Start stats coro
asyncio.create_task(self.publish_stats())
@await_ready_state
async def publish_stats(self):
from utime import time
_d = self.stats_interval * 1000 # delay
_st = time() # start time
_tup = "{}/$stats/uptime".format(self.dtopic) # Uptime topic
_tfh = "{}/$stats/freeheap".format(self.dtopic) # Freeheap topic
publish = self.publish
while True:
uptime = time() - _st
await publish(_tup, str(uptime))
await publish(_tfh, str(mem_free()))
await sleep_ms(_d)
async def run(self):
while True:
try:
if self._wifi:
await self.setup_wifi()
await self.mqtt.connect()
while True:
collect()
await sleep_ms(MAIN_DELAY)
except OSError:
print("ERROR: can not connect to MQTT")
await sleep_ms(5000)
def run_forever(self):
if RTC().memory() == b"webrepl":
RTC().memory(b"")
else:
asyncio.run(self.run())
async def reset(self, reason):
if reason != "reset":
RTC().memory(reason)
await self.publish("{}/{}".format(self.dtopic, DEVICE_STATE), reason)
await self.mqtt.disconnect()
await sleep_ms(500)
reset()
async def wdt(self):
from machine import WDT
wdt = WDT()
while True:
wdt.feed()
await sleep_ms(WDT_DELAY)
def dprint(self, *args):
if self.debug:
print(*args)
async def setup_wifi(self):
from homie.network import get_wifi_credentials
while True:
wifi_cfg = get_wifi_credentials(self._wifi)
if wifi_cfg is None:
self.dprint("No WiFi found. Rescanning...")
await sleep_ms(self._wifi_rescan_delay)
else:
self.dprint("Connect to SSID: {}".format(wifi_cfg[0]))
self.mqtt._ssid = wifi_cfg[0]
self.mqtt._wifi_pw = wifi_cfg[1]
return

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from mqtt_as import LINUX
if LINUX is False:
from network import WLAN, AP_IF, STA_IF
from ubinascii import hexlify
def enable_ap():
"""Disables any Accesspoint"""
wlan = WLAN(AP_IF)
wlan.active(True)
print("NETWORK: Access Point enabled.")
def disable_ap():
"""Disables any Accesspoint"""
wlan = WLAN(AP_IF)
wlan.active(False)
print("NETWORK: Access Point disabled.")
def get_local_ip():
try:
return bytes(WLAN(0).ifconfig()[0], "utf-8")
except NameError:
return b"127.0.0.1"
def get_local_mac():
try:
return hexlify(WLAN(0).config("mac"), ":")
except NameError:
return b"00:00:00:00:00:00"
def get_wifi_credentials(wifi):
wlan = WLAN(STA_IF)
ssids = wlan.scan()
for s in ssids:
ssid = s[0].decode()
if ssid in wifi:
return (ssid, wifi[ssid])
return None

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import uasyncio as asyncio
class BaseNode:
def __init__(self, id, name, type):
self.id = id
self.name = name
self.type = type
self.topic = None
self.device = None
self.properties = []
def set_topic(self):
self.topic = "{}/{}".format(
self.device.dtopic,
self.id,
)
def add_property(self, p, cb=None):
p.node = self
self.properties.append(p)
if cb:
p.on_message = cb
async def publish_properties(self):
"""General properties of this node"""
publish = self.device.publish
# Publish name and type
await publish("{}/$name".format(self.topic), self.name)
await publish("{}/$type".format(self.topic), self.type)
# Publish properties registerd with the node
properties = self.properties
await publish(
"{}/$properties".format(self.topic),
",".join([p.id for p in properties]),
)
# Publish registerd properties
for p in properties:
await p.publish_properties()
# Keep for backward compatibility
HomieNode = BaseNode

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import uasyncio as asyncio
from homie.constants import STRING, T_SET, TRUE, FALSE
from homie.validator import payload_is_valid
class BaseProperty:
def __init__(
self,
id,
name=None,
settable=False,
retained=True,
unit=None,
datatype=STRING,
format=None,
default=None,
restore=True,
on_message=None,
):
self._value = default
self.id = id
self.name = name
self.settable = settable
self.retained = retained
self.unit = unit
self.datatype = datatype
self.format = format
self.restore = restore
self.on_message = on_message
self.topic = None
self.node = None
# Keep for backward compatibility
@property
def data(self):
return self._value
# Keep for backward compatibility
@data.setter
def data(self, value):
self.value = value
@property
def value(self):
return self._value
@value.setter
def value(self, value):
""" Set value if changed and publish to mqtt """
if value != self._value:
self._value = value
self.publish()
def set_topic(self):
self.topic = "{}/{}/{}".format(
self.node.device.dtopic,
self.node.id,
self.id
)
def publish(self):
asyncio.create_task(
self.node.device.publish(
self.topic,
self.value,
self.retained
)
)
async def subscribe(self):
# Restore from topic with retained message on device start
if self.restore and self.node.device.first_start is True:
self.node.device.callback_topics[self.topic] = self.restore_handler
await self.node.device.subscribe(self.topic)
# Subscribe to settable (/set) topics
if self.settable is True:
topic = "{}/set".format(self.topic)
self.node.device.callback_topics[topic] = self.message_handler
await self.node.device.subscribe(topic)
def restore_handler(self, topic, payload, retained):
""" Gets called when the property should be restored from mqtt """
# Retained messages are not allowed on /set topics
if topic.endswith(T_SET):
return
# Unsubscribe from topic and remove the callback handler
asyncio.create_task(self.node.device.unsubscribe(topic))
del self.node.device.callback_topics[topic]
if payload_is_valid(self, payload):
if payload != self._value:
if self.on_message:
self.on_message(topic, payload, retained)
self._value = payload
def message_handler(self, topic, payload, retained):
""" Gets called when the property receive a message on /set topic """
# No reatained messages allowed on /set topics
if retained:
return
if payload_is_valid(self, payload):
if self.on_message:
self.on_message(topic, payload, retained)
self.value = payload
async def publish_properties(self):
topic = self.topic
publish = self.node.device.publish
await publish("{}/$name".format(topic), self.name)
await publish("{}/$datatype".format(topic), self.datatype)
if self.format is not None:
await publish("{}/$format".format(topic), self.format)
if self.settable is True:
await publish("{}/$settable".format(topic), TRUE)
if self.retained is False:
await publish("{}/$retained".format(topic), FALSE)
if self.unit is not None:
await publish("{}/$unit".format(topic), self.unit)
HomieProperty = BaseProperty
# Keep for backward compatibility
HomieNodeProperty = BaseProperty

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from homie.constants import (
BOOLEAN,
COLOR,
ENUM,
FALSE,
FLOAT,
INTEGER,
STRING,
TRUE,
RGB,
)
def payload_is_valid(cls, payload):
_dt = cls.datatype
_fmt = cls.format
if _dt == STRING:
pass
elif _dt == INTEGER:
try:
i = int(payload)
if _fmt != None:
first, last = _fmt.split(":")
first = int(first)
last = int(last)
if i < first or i > last:
return False
except ValueError:
return False
elif _dt == FLOAT:
try:
float(payload)
except ValueError:
return False
elif _dt == BOOLEAN:
if payload != TRUE and payload != FALSE:
return False
elif _dt == ENUM:
_values = cls.format.split(",")
if payload not in _values:
return False
elif _dt == COLOR:
if _fmt == RGB:
if len(payload.split(",")) != 3:
return False
return True

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# mqtt_as.py Asynchronous version of umqtt.robust
# (C) Copyright Peter Hinch 2017-2019.
# (C) Copyright Kevin Köck 2018-2019.
# Released under the MIT licence.
# Pyboard D support added
# Various improvements contributed by Kevin Köck.
import gc
import usocket as socket
import ustruct as struct
gc.collect()
from ubinascii import hexlify
import uasyncio as asyncio
gc.collect()
from utime import ticks_ms, ticks_diff
from uerrno import EINPROGRESS, ETIMEDOUT
gc.collect()
from micropython import const
gc.collect()
from sys import platform
VERSION = (0, 6, 0)
# Default short delay for good SynCom throughput (avoid sleep(0) with SynCom).
_DEFAULT_MS = const(20)
_SOCKET_POLL_DELAY = const(5) # 100ms added greatly to publish latency
# Legitimate errors while waiting on a socket. See uasyncio __init__.py open_connection().
if platform == 'esp32' or platform == 'esp32_LoBo':
# https://forum.micropython.org/viewtopic.php?f=16&t=3608&p=20942#p20942
BUSY_ERRORS = [EINPROGRESS, ETIMEDOUT, 118, 119] # Add in weird ESP32 errors
else:
BUSY_ERRORS = [EINPROGRESS, ETIMEDOUT]
ESP8266 = platform == 'esp8266'
ESP32 = platform == 'esp32'
PYBOARD = platform == 'pyboard'
LOBO = platform == 'esp32_LoBo'
LINUX = platform == "linux"
if LINUX is False:
import network
from machine import unique_id
else:
def unique_id():
raise NotImplementedError("Linux doesn't have a unique id. Provide the argument client_id")
# Default "do little" coro for optional user replacement
async def eliza(*_): # e.g. via set_wifi_handler(coro): see test program
await asyncio.sleep_ms(_DEFAULT_MS)
class MQTTException(Exception):
pass
def pid_gen():
pid = 0
while True:
pid = pid + 1 if pid < 65535 else 1
yield pid
def qos_check(qos):
if not (qos == 0 or qos == 1):
raise ValueError('Only qos 0 and 1 are supported.')
# MQTT_base class. Handles MQTT protocol on the basis of a good connection.
# Exceptions from connectivity failures are handled by MQTTClient subclass.
class MQTT_base:
REPUB_COUNT = 0 # TEST
DEBUG = False
def __init__(self, client_id, server, port, user, password, keepalive, ping_interval,
ssl, ssl_params, response_time, clean_init, clean, max_repubs, will,
subs_cb, wifi_coro, connect_coro, ssid, wifi_pw):
# MQTT config
self.ping_interval = ping_interval
self._client_id = client_id
self._user = user
self._pswd = password
self._keepalive = keepalive
if self._keepalive >= 65536:
raise ValueError('invalid keepalive time')
self._response_time = response_time * 1000 # Repub if no PUBACK received (ms).
self._max_repubs = max_repubs
self._clean_init = clean_init # clean_session state on first connection
self._clean = clean # clean_session state on reconnect
if will is None:
self._lw_topic = False
else:
self._set_last_will(*will)
# WiFi config
self._ssid = ssid # Required ESP32 / Pyboard D
self._wifi_pw = wifi_pw
self._ssl = ssl
self._ssl_params = ssl_params
# Callbacks and coros
self._cb = subs_cb
self._wifi_handler = wifi_coro
self._connect_handler = connect_coro
# Network
self.port = port
if self.port == 0:
self.port = 8883 if self._ssl else 1883
self.server = server
if self.server is None:
raise ValueError('no server specified.')
self._sock = None
if LINUX is True:
self._sta_isconnected = True
else:
self._sta_if = network.WLAN(network.STA_IF)
self._sta_if.active(True)
self.newpid = pid_gen()
self.rcv_pids = set() # PUBACK and SUBACK pids awaiting ACK response
self.last_rx = ticks_ms() # Time of last communication from broker
self.lock = asyncio.Lock()
def _set_last_will(self, topic, msg, retain=False, qos=0):
qos_check(qos)
if not topic:
raise ValueError('Empty topic.')
self._lw_topic = topic
self._lw_msg = msg
self._lw_qos = qos
self._lw_retain = retain
def dprint(self, *args):
if self.DEBUG:
print(*args)
def _timeout(self, t):
return ticks_diff(ticks_ms(), t) > self._response_time
async def _as_read(self, n, sock=None): # OSError caught by superclass
if sock is None:
sock = self._sock
data = b''
t = ticks_ms()
while len(data) < n:
if self._timeout(t) or not self.isconnected():
raise OSError(-1)
try:
msg = sock.read(n - len(data))
except OSError as e: # ESP32 issues weird 119 errors here
msg = None
if e.args[0] not in BUSY_ERRORS:
raise
if msg == b'': # Connection closed by host
raise OSError(-1)
if msg is not None: # data received
data = b''.join((data, msg))
t = ticks_ms()
self.last_rx = ticks_ms()
await asyncio.sleep_ms(_SOCKET_POLL_DELAY)
return data
async def _as_write(self, bytes_wr, length=0, sock=None):
if sock is None:
sock = self._sock
if length:
bytes_wr = bytes_wr[:length]
t = ticks_ms()
while bytes_wr:
if self._timeout(t) or not self.isconnected():
raise OSError(-1)
try:
n = sock.write(bytes_wr)
except OSError as e: # ESP32 issues weird 119 errors here
n = 0
if e.args[0] not in BUSY_ERRORS:
raise
if n:
t = ticks_ms()
bytes_wr = bytes_wr[n:]
await asyncio.sleep_ms(_SOCKET_POLL_DELAY)
async def _send_str(self, s):
await self._as_write(struct.pack("!H", len(s)))
await self._as_write(s)
async def _recv_len(self):
n = 0
sh = 0
while 1:
res = await self._as_read(1)
b = res[0]
n |= (b & 0x7f) << sh
if not b & 0x80:
return n
sh += 7
async def _connect(self, clean):
self._sock = socket.socket()
self._sock.setblocking(False)
try:
self._sock.connect(self._addr)
except OSError as e:
if e.args[0] not in BUSY_ERRORS:
raise
await asyncio.sleep_ms(_DEFAULT_MS)
self.dprint('Connecting to broker.')
if self._ssl:
import ussl
self._sock = ussl.wrap_socket(self._sock, **self._ssl_params)
premsg = bytearray(b"\x10\0\0\0\0\0")
msg = bytearray(b"\x04MQTT\x04\0\0\0") # Protocol 3.1.1
sz = 10 + 2 + len(self._client_id)
msg[6] = clean << 1
if self._user:
sz += 2 + len(self._user) + 2 + len(self._pswd)
msg[6] |= 0xC0
if self._keepalive:
msg[7] |= self._keepalive >> 8
msg[8] |= self._keepalive & 0x00FF
if self._lw_topic:
sz += 2 + len(self._lw_topic) + 2 + len(self._lw_msg)
msg[6] |= 0x4 | (self._lw_qos & 0x1) << 3 | (self._lw_qos & 0x2) << 3
msg[6] |= self._lw_retain << 5
i = 1
while sz > 0x7f:
premsg[i] = (sz & 0x7f) | 0x80
sz >>= 7
i += 1
premsg[i] = sz
await self._as_write(premsg, i + 2)
await self._as_write(msg)
await self._send_str(self._client_id)
if self._lw_topic:
await self._send_str(self._lw_topic)
await self._send_str(self._lw_msg)
if self._user:
await self._send_str(self._user)
await self._send_str(self._pswd)
# Await CONNACK
# read causes ECONNABORTED if broker is out; triggers a reconnect.
resp = await self._as_read(4)
self.dprint('Connected to broker.') # Got CONNACK
if resp[3] != 0 or resp[0] != 0x20 or resp[1] != 0x02:
raise OSError(-1) # Bad CONNACK e.g. authentication fail.
async def _ping(self):
async with self.lock:
await self._as_write(b"\xc0\0")
# Check internet connectivity by sending DNS lookup to Google's 8.8.8.8
async def wan_ok(self,
packet=b'$\x1a\x01\x00\x00\x01\x00\x00\x00\x00\x00\x00\x03www\x06google\x03com\x00\x00\x01\x00\x01'):
if not self.isconnected(): # WiFi is down
return False
length = 32 # DNS query and response packet size
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
s.setblocking(False)
s.connect(('8.8.8.8', 53))
await asyncio.sleep(1)
try:
await self._as_write(packet, sock=s)
await asyncio.sleep(2)
res = await self._as_read(length, s)
if len(res) == length:
return True # DNS response size OK
except OSError: # Timeout on read: no connectivity.
return False
finally:
s.close()
return False
async def broker_up(self): # Test broker connectivity
if not self.isconnected():
return False
tlast = self.last_rx
if ticks_diff(ticks_ms(), tlast) < 1000:
return True
try:
await self._ping()
except OSError:
return False
t = ticks_ms()
while not self._timeout(t):
await asyncio.sleep_ms(100)
if ticks_diff(self.last_rx, tlast) > 0: # Response received
return True
return False
async def disconnect(self):
try:
async with self.lock:
self._sock.write(b"\xe0\0")
except OSError:
pass
self._has_connected = False
self.close()
def close(self):
if self._sock is not None:
self._sock.close()
async def _await_pid(self, pid):
t = ticks_ms()
while pid in self.rcv_pids: # local copy
if self._timeout(t) or not self.isconnected():
break # Must repub or bail out
await asyncio.sleep_ms(100)
else:
return True # PID received. All done.
return False
# qos == 1: coro blocks until wait_msg gets correct PID.
# If WiFi fails completely subclass re-publishes with new PID.
async def publish(self, topic, msg, retain, qos):
pid = next(self.newpid)
if qos:
self.rcv_pids.add(pid)
async with self.lock:
await self._publish(topic, msg, retain, qos, 0, pid)
if qos == 0:
return
count = 0
while 1: # Await PUBACK, republish on timeout
if await self._await_pid(pid):
return
# No match
if count >= self._max_repubs or not self.isconnected():
raise OSError(-1) # Subclass to re-publish with new PID
async with self.lock:
await self._publish(topic, msg, retain, qos, dup=1, pid=pid) # Add pid
count += 1
self.REPUB_COUNT += 1
async def _publish(self, topic, msg, retain, qos, dup, pid):
pkt = bytearray(b"\x30\0\0\0")
pkt[0] |= qos << 1 | retain | dup << 3
sz = 2 + len(topic) + len(msg)
if qos > 0:
sz += 2
if sz >= 2097152:
raise MQTTException('Strings too long.')
i = 1
while sz > 0x7f:
pkt[i] = (sz & 0x7f) | 0x80
sz >>= 7
i += 1
pkt[i] = sz
await self._as_write(pkt, i + 1)
await self._send_str(topic)
if qos > 0:
struct.pack_into("!H", pkt, 0, pid)
await self._as_write(pkt, 2)
await self._as_write(msg)
# Can raise OSError if WiFi fails. Subclass traps
async def subscribe(self, topic, qos):
pkt = bytearray(b"\x82\0\0\0")
pid = next(self.newpid)
self.rcv_pids.add(pid)
struct.pack_into("!BH", pkt, 1, 2 + 2 + len(topic) + 1, pid)
async with self.lock:
await self._as_write(pkt)
await self._send_str(topic)
await self._as_write(qos.to_bytes(1, "little"))
if not await self._await_pid(pid):
raise OSError(-1)
# Can raise OSError if WiFi fails. Subclass traps
async def unsubscribe(self, topic):
pkt = bytearray(b"\xa2\0\0\0")
pid = next(self.newpid)
self.rcv_pids.add(pid)
struct.pack_into("!BH", pkt, 1, 2 + 2 + len(topic), pid)
async with self.lock:
await self._as_write(pkt)
await self._send_str(topic)
if not await self._await_pid(pid):
raise OSError(-1)
# Wait for a single incoming MQTT message and process it.
# Subscribed messages are delivered to a callback previously
# set by .setup() method. Other (internal) MQTT
# messages processed internally.
# Immediate return if no data available. Called from ._handle_msg().
async def wait_msg(self):
res = self._sock.read(1) # Throws OSError on WiFi fail
if res is None:
return
if res == b'':
raise OSError(-1)
if res == b"\xd0": # PINGRESP
await self._as_read(1) # Update .last_rx time
return
op = res[0]
if op == 0x40: # PUBACK: save pid
sz = await self._as_read(1)
if sz != b"\x02":
raise OSError(-1)
rcv_pid = await self._as_read(2)
pid = rcv_pid[0] << 8 | rcv_pid[1]
if pid in self.rcv_pids:
self.rcv_pids.discard(pid)
else:
raise OSError(-1)
if op == 0x90: # SUBACK
resp = await self._as_read(4)
if resp[3] == 0x80:
raise OSError(-1)
pid = resp[2] | (resp[1] << 8)
if pid in self.rcv_pids:
self.rcv_pids.discard(pid)
else:
raise OSError(-1)
if op == 0xB0: # UNSUBACK
resp = await self._as_read(3)
pid = resp[2] | (resp[1] << 8)
if pid in self.rcv_pids:
self.rcv_pids.discard(pid)
else:
raise OSError(-1)
if op & 0xf0 != 0x30:
return
sz = await self._recv_len()
topic_len = await self._as_read(2)
topic_len = (topic_len[0] << 8) | topic_len[1]
topic = await self._as_read(topic_len)
sz -= topic_len + 2
if op & 6:
pid = await self._as_read(2)
pid = pid[0] << 8 | pid[1]
sz -= 2
msg = await self._as_read(sz)
retained = op & 0x01
self._cb(topic, msg, bool(retained))
if op & 6 == 2: # qos 1
pkt = bytearray(b"\x40\x02\0\0") # Send PUBACK
struct.pack_into("!H", pkt, 2, pid)
await self._as_write(pkt)
elif op & 6 == 4: # qos 2 not supported
raise OSError(-1)
# MQTTClient class. Handles issues relating to connectivity.
class MQTTClient(MQTT_base):
def __init__(self, client_id=None,
server=None,
port=0,
user='',
password='',
keepalive=60,
ping_interval=0,
ssl=False,
ssl_params={},
response_time=10,
clean_init=True,
clean=True,
max_repubs=4,
will=None,
subs_cb=lambda *_: None,
wifi_coro=None,
connect_coro=None,
ssid=None,
wifi_pw=None):
client_id = client_id or hexlify(unique_id())
wifi_coro = wifi_coro or eliza
connect_coro = connect_coro or eliza
super().__init__(client_id, server, port, user, password, keepalive, ping_interval,
ssl, ssl_params, response_time, clean_init, clean, max_repubs, will,
subs_cb, wifi_coro, connect_coro, ssid, wifi_pw)
self._isconnected = False # Current connection state
keepalive = 1000 * self._keepalive # ms
self._ping_interval = keepalive // 4 if keepalive else 20000
p_i = self.ping_interval * 1000 # Can specify shorter e.g. for subscribe-only
if p_i and p_i < self._ping_interval:
self._ping_interval = p_i
self._in_connect = False
self._has_connected = False # Define 'Clean Session' value to use.
if ESP8266:
import esp
esp.sleep_type(0) # Improve connection integrity at cost of power consumption.
async def wifi_connect(self):
if LINUX is True: # no network control, assume connected as OS takes care of that
self._sta_isconnected = True
return
s = self._sta_if
if ESP8266:
if s.isconnected(): # 1st attempt, already connected.
return
s.active(True)
s.connect() # ESP8266 remembers connection.
for _ in range(60):
if s.status() != network.STAT_CONNECTING: # Break out on fail or success. Check once per sec.
break
await asyncio.sleep(1)
if s.status() == network.STAT_CONNECTING: # might hang forever awaiting dhcp lease renewal or something else
s.disconnect()
await asyncio.sleep(1)
if not s.isconnected() and self._ssid is not None and self._wifi_pw is not None:
s.connect(self._ssid, self._wifi_pw)
while s.status() == network.STAT_CONNECTING: # Break out on fail or success. Check once per sec.
await asyncio.sleep(1)
else:
s.active(True)
s.connect(self._ssid, self._wifi_pw)
if PYBOARD: # Doesn't yet have STAT_CONNECTING constant
while s.status() in (1, 2):
await asyncio.sleep(1)
elif LOBO:
i = 0
while not s.isconnected():
await asyncio.sleep(1)
i += 1
if i >= 10:
break
else:
while s.status() == network.STAT_CONNECTING: # Break out on fail or success. Check once per sec.
await asyncio.sleep(1)
if not s.isconnected():
raise OSError
# Ensure connection stays up for a few secs.
self.dprint('Checking WiFi integrity.')
for _ in range(5):
if not s.isconnected():
raise OSError # in 1st 5 secs
await asyncio.sleep(1)
self.dprint('Got reliable connection')
async def connect(self):
if not self._has_connected:
await self.wifi_connect() # On 1st call, caller handles error
# Note this blocks if DNS lookup occurs. Do it once to prevent
# blocking during later internet outage:
self._addr = socket.getaddrinfo(self.server, self.port)[0][-1]
self._in_connect = True # Disable low level ._isconnected check
clean = self._clean if self._has_connected else self._clean_init
try:
await self._connect(clean)
except Exception:
self.close()
raise
self.rcv_pids.clear()
# If we get here without error broker/LAN must be up.
self._isconnected = True
self._in_connect = False # Low level code can now check connectivity.
loop = asyncio.get_event_loop()
loop.create_task(self._wifi_handler(True)) # User handler.
if not self._has_connected:
self._has_connected = True # Use normal clean flag on reconnect.
loop.create_task(
self._keep_connected()) # Runs forever unless user issues .disconnect()
loop.create_task(self._handle_msg()) # Tasks quit on connection fail.
loop.create_task(self._keep_alive())
if self.DEBUG:
loop.create_task(self._memory())
loop.create_task(self._connect_handler(self)) # User handler.
# Launched by .connect(). Runs until connectivity fails. Checks for and
# handles incoming messages.
async def _handle_msg(self):
try:
while self.isconnected():
async with self.lock:
await self.wait_msg() # Immediate return if no message
await asyncio.sleep_ms(_DEFAULT_MS) # Let other tasks get lock
except OSError:
pass
self._reconnect() # Broker or WiFi fail.
# Keep broker alive MQTT spec 3.1.2.10 Keep Alive.
# Runs until ping failure or no response in keepalive period.
async def _keep_alive(self):
while self.isconnected():
pings_due = ticks_diff(ticks_ms(), self.last_rx) // self._ping_interval
if pings_due >= 4:
self.dprint('Reconnect: broker fail.')
break
elif pings_due >= 1:
try:
await self._ping()
except OSError:
break
await asyncio.sleep(1)
self._reconnect() # Broker or WiFi fail.
# DEBUG: show RAM messages.
async def _memory(self):
count = 0
while self.isconnected(): # Ensure just one instance.
await asyncio.sleep(1) # Quick response to outage.
count += 1
count %= 20
if not count:
gc.collect()
print('RAM free {} alloc {}'.format(gc.mem_free(), gc.mem_alloc()))
def isconnected(self):
if self._in_connect: # Disable low-level check during .connect()
return True
if LINUX is True:
if self._isconnected and self._sta_isconnected is False:
self._reconnect()
else:
if self._isconnected and not self._sta_if.isconnected(): # It's going down.
self._reconnect()
return self._isconnected
def _reconnect(self): # Schedule a reconnection if not underway.
if self._isconnected:
self._isconnected = False
self.close()
loop = asyncio.get_event_loop()
loop.create_task(self._wifi_handler(False)) # User handler.
# Await broker connection.
async def _connection(self):
while not self._isconnected:
await asyncio.sleep(1)
# Scheduled on 1st successful connection. Runs forever maintaining wifi and
# broker connection. Must handle conditions at edge of WiFi range.
async def _keep_connected(self):
while self._has_connected:
if self.isconnected(): # Pause for 1 second
await asyncio.sleep(1)
gc.collect()
else:
if LINUX is True:
self._sta_isconnected = False
else:
self._sta_if.disconnect()
await asyncio.sleep(1)
try:
await self.wifi_connect()
except OSError:
continue
if not self._has_connected: # User has issued the terminal .disconnect()
self.dprint('Disconnected, exiting _keep_connected')
break
try:
await self.connect()
# Now has set ._isconnected and scheduled _connect_handler().
self.dprint('Reconnect OK!')
except OSError as e:
self.dprint('Error in reconnect.', e)
# Can get ECONNABORTED or -1. The latter signifies no or bad CONNACK received.
self.close() # Disconnect and try again.
self._in_connect = False
self._isconnected = False
self.dprint('Disconnected, exited _keep_connected')
async def subscribe(self, topic, qos=0):
qos_check(qos)
while 1:
await self._connection()
try:
return await super().subscribe(topic, qos)
except OSError:
pass
self._reconnect() # Broker or WiFi fail.
async def unsubscribe(self, topic):
while 1:
await self._connection()
try:
return await super().unsubscribe(topic)
except OSError:
pass
self._reconnect() # Broker or WiFi fail.
async def publish(self, topic, msg, retain=False, qos=0):
qos_check(qos)
while 1:
await self._connection()
try:
return await super().publish(topic, msg, retain, qos)
except OSError:
pass
self._reconnect() # Broker or WiFi fail.

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# __init__.py Common functions for uasyncio primitives
# Copyright (c) 2018-2020 Peter Hinch
# Released under the MIT License (MIT) - see LICENSE file
try:
import uasyncio as asyncio
except ImportError:
import asyncio
async def _g():
pass
type_coro = type(_g())
# If a callback is passed, run it and return.
# If a coro is passed initiate it and return.
# coros are passed by name i.e. not using function call syntax.
def launch(func, tup_args):
res = func(*tup_args)
if isinstance(res, type_coro):
res = asyncio.create_task(res)
return res
def set_global_exception():
def _handle_exception(loop, context):
import sys
sys.print_exception(context["exception"])
sys.exit()
loop = asyncio.get_event_loop()
loop.set_exception_handler(_handle_exception)

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# delay_ms.py
# Copyright (c) 2018-2020 Peter Hinch
# Released under the MIT License (MIT) - see LICENSE file
# Rewritten for uasyncio V3. Allows stop time to be brought forwards.
import uasyncio as asyncio
from utime import ticks_add, ticks_diff, ticks_ms
from micropython import schedule
from . import launch
# Usage:
# from primitives.delay_ms import Delay_ms
class Delay_ms:
verbose = False # verbose and can_alloc retained to avoid breaking code.
def __init__(self, func=None, args=(), can_alloc=True, duration=1000):
self._func = func
self._args = args
self._duration = duration # Default duration
self._tstop = None # Stop time (ms). None signifies not running.
self._tsave = None # Temporary storage for stop time
self._ktask = None # timer task
self._retrn = None # Return value of launched callable
self._do_trig = self._trig # Avoid allocation in .trigger
def stop(self):
if self._ktask is not None:
self._ktask.cancel()
def trigger(self, duration=0): # Update end time
now = ticks_ms()
if duration <= 0: # Use default set by constructor
duration = self._duration
self._retrn = None
is_running = self()
tstop = self._tstop # Current stop time
# Retriggering normally just updates ._tstop for ._timer
self._tstop = ticks_add(now, duration)
# Identify special case where we are bringing the end time forward
can = is_running and duration < ticks_diff(tstop, now)
if not is_running or can:
schedule(self._do_trig, can)
def _trig(self, can):
if can:
self._ktask.cancel()
self._ktask = asyncio.create_task(self._timer(can))
def __call__(self): # Current running status
return self._tstop is not None
running = __call__
def rvalue(self):
return self._retrn
async def _timer(self, restart):
if restart: # Restore cached end time
self._tstop = self._tsave
try:
twait = ticks_diff(self._tstop, ticks_ms())
while twait > 0: # Must loop here: might be retriggered
await asyncio.sleep_ms(twait)
twait = ticks_diff(self._tstop, ticks_ms())
if self._func is not None: # Timed out: execute callback
self._retrn = launch(self._func, self._args)
finally:
self._tsave = self._tstop # Save in case we restart.
self._tstop = None # timer is stopped

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# message.py
# Copyright (c) 2018-2020 Peter Hinch
# Released under the MIT License (MIT) - see LICENSE file
try:
import uasyncio as asyncio
except ImportError:
import asyncio
# Usage:
# from primitives.message import Message
# A coro waiting on a message issues await message
# A coro rasing the message issues message.set(payload)
# When all waiting coros have run
# message.clear() should be issued
# This more efficient version is commented out because Event.set is not ISR
# friendly. TODO If it gets fixed, reinstate this (tested) version and update
# tutorial for 1:n operation.
#class Message(asyncio.Event):
#def __init__(self, _=0):
#self._data = None
#super().__init__()
#def clear(self):
#self._data = None
#super().clear()
#def __await__(self):
#await super().wait()
#__iter__ = __await__
#def set(self, data=None):
#self._data = data
#super().set()
#def value(self):
#return self._data
# Has an ISR-friendly .set()
class Message():
def __init__(self, delay_ms=0):
self.delay_ms = delay_ms
self.clear()
def clear(self):
self._flag = False
self._data = None
async def wait(self): # CPython comptaibility
while not self._flag:
await asyncio.sleep_ms(self.delay_ms)
def __await__(self):
while not self._flag:
await asyncio.sleep_ms(self.delay_ms)
__iter__ = __await__
def is_set(self):
return self._flag
def set(self, data=None):
self._flag = True
self._data = data
def value(self):
return self._data

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# pushbutton.py
# Copyright (c) 2018-2020 Peter Hinch
# Released under the MIT License (MIT) - see LICENSE file
import uasyncio as asyncio
import utime as time
from . import launch
from primitives.delay_ms import Delay_ms
# An alternative Pushbutton solution with lower RAM use is available here
# https://github.com/kevinkk525/pysmartnode/blob/dev/pysmartnode/utils/abutton.py
class Pushbutton:
debounce_ms = 50
long_press_ms = 1000
double_click_ms = 400
def __init__(self, pin, suppress=False, sense=None):
self.pin = pin # Initialise for input
self._supp = suppress
self._dblpend = False # Doubleclick waiting for 2nd click
self._dblran = False # Doubleclick executed user function
self._tf = False
self._ff = False
self._df = False
self._lf = False
self._ld = False # Delay_ms instance for long press
self._dd = False # Ditto for doubleclick
self.sense = pin.value() if sense is None else sense # Convert from electrical to logical value
self.state = self.rawstate() # Initial state
asyncio.create_task(self.buttoncheck()) # Thread runs forever
def press_func(self, func, args=()):
self._tf = func
self._ta = args
def release_func(self, func, args=()):
self._ff = func
self._fa = args
def double_func(self, func, args=()):
self._df = func
self._da = args
def long_func(self, func, args=()):
self._lf = func
self._la = args
# Current non-debounced logical button state: True == pressed
def rawstate(self):
return bool(self.pin.value() ^ self.sense)
# Current debounced state of button (True == pressed)
def __call__(self):
return self.state
def _ddto(self): # Doubleclick timeout: no doubleclick occurred
self._dblpend = False
if self._supp and not self.state:
if not self._ld or (self._ld and not self._ld()):
launch(self._ff, self._fa)
async def buttoncheck(self):
if self._lf: # Instantiate timers if funcs exist
self._ld = Delay_ms(self._lf, self._la)
if self._df:
self._dd = Delay_ms(self._ddto)
while True:
state = self.rawstate()
# State has changed: act on it now.
if state != self.state:
self.state = state
if state: # Button pressed: launch pressed func
if self._tf:
launch(self._tf, self._ta)
if self._lf: # There's a long func: start long press delay
self._ld.trigger(Pushbutton.long_press_ms)
if self._df:
if self._dd(): # Second click: timer running
self._dd.stop()
self._dblpend = False
self._dblran = True # Prevent suppressed launch on release
launch(self._df, self._da)
else:
# First click: start doubleclick timer
self._dd.trigger(Pushbutton.double_click_ms)
self._dblpend = True # Prevent suppressed launch on release
else: # Button release. Is there a release func?
if self._ff:
if self._supp:
d = self._ld
# If long delay exists, is running and doubleclick status is OK
if not self._dblpend and not self._dblran:
if (d and d()) or not d:
launch(self._ff, self._fa)
else:
launch(self._ff, self._fa)
if self._ld:
self._ld.stop() # Avoid interpreting a second click as a long push
self._dblran = False
# Ignore state changes until switch has settled
await asyncio.sleep_ms(Pushbutton.debounce_ms)

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# switch.py
# Copyright (c) 2018-2020 Peter Hinch
# Released under the MIT License (MIT) - see LICENSE file
import uasyncio as asyncio
import utime as time
from . import launch
class Switch:
debounce_ms = 50
def __init__(self, pin):
self.pin = pin # Should be initialised for input with pullup
self._open_func = False
self._close_func = False
self.switchstate = self.pin.value() # Get initial state
asyncio.create_task(self.switchcheck()) # Thread runs forever
def open_func(self, func, args=()):
self._open_func = func
self._open_args = args
def close_func(self, func, args=()):
self._close_func = func
self._close_args = args
# Return current state of switch (0 = pressed)
def __call__(self):
return self.switchstate
async def switchcheck(self):
while True:
state = self.pin.value()
if state != self.switchstate:
# State has changed: act on it now.
self.switchstate = state
if state == 0 and self._close_func:
launch(self._close_func, self._close_args)
elif state == 1 and self._open_func:
launch(self._open_func, self._open_args)
# Ignore further state changes until switch has settled
await asyncio.sleep_ms(Switch.debounce_ms)

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from homie.device import HomieDevice
from machine import Pin, I2C
import settings
# import uasyncio as asyncio
# from time import ticks_ms, ticks_add, ticks_diff
import bme280
from bmp280_node import BMP280Node
import neopixel
from led_control_node import LEDControlNode
def main():
i2c = I2C(scl=Pin(16), sda=Pin(17))
bmp280 = bme280.BME280(i2c=i2c)
bmp280Node = BMP280Node(
id="bmp280",
name="Enviroment-Sensor",
bmp280=bmp280)
leds = neopixel.NeoPixel(Pin(23, Pin.OUT), 28)
controlNode = LEDControlNode(
id="leds1", name="LEDs",
pin_up=Pin(18), pin_down=Pin(5), leds=leds)
# Homie device setup
homie = HomieDevice(settings)
homie.add_node(bmp280Node)
homie.add_node(controlNode)
# run forever
homie.run_forever()
if __name__ == "__main__":
main()

147
src/plant_node.py Normal file
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from homie.constants import BOOLEAN, FALSE, TRUE, FLOAT
from homie.property import HomieProperty
from update_homie_node import UpdateHomieNode
# from homie.device import await_ready_state
from machine import Pin, ADC
import uasyncio as asyncio
import gc
class PlantNode(UpdateHomieNode):
def __init__(
self,
id,
name,
watering_motor,
moisture_sensor,
pin_water_tank,
waterlevel_sensor,
interval=60*5,
interval_watering=0.2):
super().__init__(
id=id, name=name, type="watering",
interval=interval,
interval_short=interval_watering)
# Update Interval
self.interval_normal = interval
self.interval_watering = interval_watering
# WaterLevelSensor
self.waterlevel_sensor = waterlevel_sensor
self.property_waterlevel = HomieProperty(
id="waterlevel",
name="Wassertankstand",
datatype=FLOAT,
unit="L",
)
self.add_property(self.property_waterlevel)
self.property_waterlevel_percent = HomieProperty(
id="waterlevel_percent",
name="Wassertankstand [%]",
datatype=FLOAT,
format="0.00:100.00",
unit="%",
)
self.add_property(self.property_waterlevel_percent)
self.property_waterlevel_volume_liter = HomieProperty(
id="waterlevel_volume_max",
name="Wassertankgröße",
settable=True,
datatype=FLOAT,
unit="L",
on_message=self._set_waterlevel_volume
)
self.add_property(self.property_waterlevel_volume_liter)
# Moisture
self.moisture_sensor = moisture_sensor
self.property_moisture = HomieProperty(
id="moisture",
name="Feuchte",
datatype=FLOAT,
format="0.00:100.00",
unit="%",
)
self.add_property(self.property_moisture)
# Watering Motor
self.watering_motor = watering_motor
self.watering_motor.add_motor_stop_callback(
self.on_watering_motor_stop)
self.watering_motor.add_motor_start_callback(
self.on_watering_motor_start)
self.property_watering_power = HomieProperty(
id="power",
name="Bewässerung",
settable=True,
datatype=BOOLEAN,
default=FALSE,
on_message=self.toggle_motor,
)
self.add_property(self.property_watering_power)
self.property_watering_max_duration = HomieProperty(
id="watering_duration",
name="Bewässerungszeit",
settable=True,
datatype=FLOAT,
default=3,
on_message=lambda t, p, r:
self.watering_motor.set_watering_duration(float(p)),
unit="s",
)
self.add_property(self.property_watering_max_duration)
def update_data(self):
self.property_moisture.value = "{:1.2f}".format(
self.moisture_sensor.value * 100)
self.property_waterlevel_percent.value = "{:1.0f}".format(
self.waterlevel_sensor.level_percent)
self.property_waterlevel.value = "{:1.2f}".format(
self.waterlevel_sensor.level)
self.property_waterlevel_volume_liter.value = "{:1.4f}".format(
self.waterlevel_sensor.volume)
self.property_watering_max_duration.value = \
str(self.watering_motor.watering_duration)
self.property_watering_power.value = \
TRUE if self.watering_motor.is_watering() else FALSE
if self.watering_motor.is_watering():
if self._interval != self.interval_watering:
self.interval_normal = self._interval
self.set_interval(self.interval_watering)
else:
self.set_interval(self.interval_normal)
gc.collect()
def toggle_motor(self, topic, payload, retained):
ONOFF = {FALSE: False, TRUE: True}
v = ONOFF[payload]
if v:
self.watering_motor.start()
else:
self.watering_motor.stop()
def on_watering_motor_stop(self):
self.set_interval(self.interval_normal)
self.property_watering_power.value = FALSE
def on_watering_motor_start(self):
if self._interval != self.interval_watering:
self.interval_normal = self._interval
self.set_interval(self.interval_watering)
def _set_waterlevel_min_value(self, topic, payload, retained):
self.waterlevel_sensor.value_min = float(payload)
def _set_waterlevel_max_value(self, topic, payload, retained):
self.waterlevel_sensor.value_max = float(payload)
def _set_waterlevel_volume(self, topic, payload, retained):
self.waterlevel_sensor.volume = float(payload)

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src/settings.py Normal file
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# Debug mode disables WDT, print mqtt messages
# DEBUG = False
###
# Wifi settings
###
# Multiple WiFi credentials
# If a ssid near your device matchs a wifi credentials in the dictionary,
# WIFI_SSID and WIFI_PASSWORD will be overwitten with the corresponding
# ssid,password. Set to False to disable multible wifis and use WIFI_SSID and
# WIFI_PASSWORD to access a WiFi nearby.
WIFI_CREDENTIALS = {}
with open("wifi-credentials", 'r') as f:
lines = f.readlines()
for i in range(0, len(lines), 2):
WIFI_CREDENTIALS[lines[i].replace("\n", "")] = lines[i+1].replace("\n", "")
WIFI_SSID, WIFI_PASSWORD = list(WIFI_CREDENTIALS.items())[0]
# The delay until wifi is rescanned to keep UI somewhat responsive
WIFI_RESCAN_DELAY = 10000
###
# MQTT settings
###
#
# Broker IP or DNS Name
MQTT_BROKER = "mqtt.nils-server"
# Broker port
MQTT_PORT = 1883
# Username or None for anonymous login
# MQTT_USERNAME = None
# Password or None for anonymous login
# MQTT_PASSWORD = None
# Defines the mqtt connection timemout in seconds
# MQTT_KEEPALIVE = 30
# SSL connection to the broker. Some MicroPython implementations currently
# have problems with receiving mqtt messages over ssl connections.
# MQTT_SSL = False
# MQTT_SSL_PARAMS = {}
# MQTT_SSL_PARAMS = {"do_handshake": True}
# Base mqtt topic the device publish and subscribes to, without leading slash.
# Base topic format is bytestring.
# MQTT_BASE_TOPIC = "homie"
###
# Device settings
###
# The device ID for registration at the broker. The device id is also the
# base topic of a device and must be unique and bytestring.
# from homie.utils import get_unique_id
DEVICE_ID = "herz-lampe" # get_unique_id()
# Friendly name of the device as bytestring
DEVICE_NAME = "Inas Herz-Lampe"
# Time in seconds the device updates device properties
DEVICE_STATS_INTERVAL = 600
# Subscribe to broadcast topic is enabled by default. To disable broadcast
# messages set BROADCAST to False
# BROADCAST = True
# Enable build-in extensions
from homie.constants import EXT_MPY
EXTENSIONS = [EXT_MPY]
# from homie.constants import EXT_MPY, EXT_FW, EXT_STATS
# EXTENSIONS = [
# EXT_MPY,
# EXT_FW,
# EXT_STATS,
# ]

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from homie.constants import FLOAT
from homie.property import HomieProperty
from homie.node import HomieNode
from homie.device import await_ready_state
import uasyncio as asyncio
from time import ticks_ms, ticks_add, ticks_diff
class UpdateHomieNode(HomieNode):
def __init__(
self,
id,
name,
type,
interval=60*5,
interval_short=0.1):
super().__init__(id=id, name=name, type=type)
self.interval_changed = False
self.interval_short = interval_short
# Update Interval
self._interval = interval
self.property_interval = HomieProperty(
id="update_interval",
name="Aktualisierungsrate",
datatype=FLOAT, # TODO ISO8601
settable=True,
on_message=self._set_interval,
unit="s",
)
self.add_property(self.property_interval)
asyncio.create_task(self._update_data_async())
@await_ready_state
async def _update_data_async(self):
while True:
# call child callback
self.update_data()
# TODO ISO8601
# self.property_interval.value = "PT{:1.3f}S".format(self.interval)
self.property_interval.value = "{:1.3f}".format(self.interval)
# We don't simply wait the update interval, as it can change while waiting.
last_update = ticks_ms()
wait_till = ticks_add(last_update, int(self.interval * 1000.0))
while ticks_diff(ticks_ms(), wait_till) < 0:
if self.interval_changed:
self.interval_changed = False
wait_till = ticks_add(
last_update,
int(self.interval * 1000))
sleep_for = min(int(self.interval_short * 1000.0),
ticks_diff(wait_till, ticks_ms()))
await asyncio.sleep_ms(sleep_for)
@property
def interval(self):
return self._interval
@interval.setter
def setter_interval(self, i):
self.set_interval(i)
def set_interval(self, i):
if i != self._interval:
self.interval_changed = True
self._interval = float(i)
def _set_interval(self, topic, payload, retained):
self.set_interval(float(payload))