Exposes general purpose inputs and outputs (GPIO), hardware sensors and serial devices to an MQTT server. Ideal for single-board computers such as the Raspberry Pi.
Visit the documentation for more detailed information.
Hardware support is provided by specific GPIO, Sensor and Stream modules. It's easy to add support for new hardware and the list is growing fast.
- Beaglebone GPIO (
beaglebone
) - Linux Kernel 4.8+ libgpiod (
gpiod
) - GPIO Zero (
gpiozero
) - MCP23017 IO expander (
mcp23017
) - Orange Pi GPIO (
orangepi
) - PCF8574 IO expander (
pcf8574
) - PCF8575 IO expander (
pcf8575
) - PiFace Digital IO 2 (
piface2
) - Raspberry Pi GPIO (
raspberrypi
) - XL9535/PCA9535/TCA9535 IO expander (
xl9535
)
- ADS1x15 analog to digital converters (
ads1x15
) - ADXl345 3-axis accelerometer up to ±16g (
adxl345
) - AHT20 temperature and humidity sensor (
aht20
) - AS3935 lightning detector (
as3935
) - BH1750 light level sensor (
bh1750
) - BME280 temperature, humidity and pressure sensor (
bme280
) - BME680 temperature, humidity and pressure sensor (
bme680
) - DHT11/DHT22/AM2302 temperature and humidity sensors (
dht22
) - DS18S20/DS1822/DS18B20/DS1825/DS28EA00/MAX31850K temperature sensors (
ds18b
) - ENS160 digital multi-gas sensor with multiple IAQ data (TVOC, eCO2, AQI) (
ens160
) - FLOWSENSOR generic flow rate sensor like YF-S201, YF-DN50 or others (
flowsensor
) - FREQUENCYCOUNTER Counts pulses from GPIOs and return the frequency in Hz (
frequencycounterr
) - HCSR04 ultrasonic range sensor (connected to the Raspberry Pi on-board GPIO) (
hcsr04
) - INA219 DC current sensor (
ina219
) - LM75 temperature sensor (
lm75
) - MCP3008 analog to digital converter (
mcp3008
) - PMS5003 particulate sensor (
pms5003
) - SHT40/SHT41/SHT45 temperature and humidity sensors (
sht4x
) - TSL2561 light level sensor (
tsl2561
) - VEML7700 light level sensor (
veml7700
) - YF-S201 flow rate sensor (
yfs201
)
- Serial port (
serial
) - PN532 NFC/RFID reader (
pn532
)
Requires Python 3.6+
pip3 install mqtt-io
python3 -m mqtt_io config.yml
Some configuration parameters can be passed as environment variables:
MQTT_IO_HOST
- Host name or IP address of the MQTT server.MQTT_IO_PORT
- Port number to connect to on the MQTT server.MQTT_IO_USER
- Username to authenticate with on the MQTT server.MQTT_IO_PASSWORD
- Password to authenticate with on the MQTT server.MQTT_IO_PROTOCOL
- Version of the MQTT protocol to use.
Environment variables take precedence over configuration files.
Configuration is written in a YAML file which is passed as an argument to the server on startup.
See the full configuration documentation for details.
The following example will configure the software to do the following:
- Publish MQTT messages on the
home/input/doorbell
topic when the doorbell is pushed and released. - Subscribe to the MQTT topic
home/output/port_light/set
and change the output when messages are received on it. - Periodically read the value of the LM75 sensor and publish it on the MQTT topic
home/sensor/porch_temperature
. - Publish any data received on the
/dev/ttyUSB0
serial port to the MQTT topichome/serial/alarm_system
. - Subscribe to the MQTT topic
home/serial/alarm_system/send
and send any data received on that topic to the serial port.
mqtt:
host: localhost
topic_prefix: home
# GPIO
gpio_modules:
# Use the Raspberry Pi built-in GPIO
- name: rpi
module: raspberrypi
digital_inputs:
# Pin 0 is an input connected to a doorbell button
- name: doorbell
module: rpi
pin: 0
digital_outputs:
# Pin 1 is an output connected to a light
- name: porch_light
module: rpi
pin: 1
# Sensors
sensor_modules:
# An LM75 sensor attached to the I2C bus
- name: lm75_sensor
module: lm75
i2c_bus_num: 1
chip_addr: 0x48
# An INA219 sensor attached to the I2C bus
- name: ina219_sensor
module: ina219
i2c_bus_num: 1
chip_addr: 0x43
sensor_inputs:
# lm75 - The configuration of the specific sensor value to use (LM75 only has temperature)
- name: porch_temperature
module: lm75_sensor
# ina219 - The configuration of the specific sensor value to use (4 options for the ina219 sensor)
- name: power
type: power
module: ina219_sensor
- name: bus_voltage
type: bus_voltage
module: ina219_sensor
- name: current
type: current
module: ina219_sensor
- name: shunt_voltage
type: shunt_voltage
module: ina219_sensor
# Streams
stream_modules:
# A serial port to communicate with the house alarm system
- name: alarm_system
module: serial
device: /dev/ttyUSB0
baud: 9600