JetHub peripherals in MQTT via mqtt-io in Linux

Installing

sudo apt install python3-pip
sudo pip3 install mqtt-io

Manual start

Before running, you must unexport all GPIO from sysfs:

Warning

Example for D1/D1+ basic. See Configuration files for other controllers.
```
echo 436 452 453 454 455 456 462 467 469 470 471 472 | xargs -n 1 echo >/sys/class/gpio/unexport
```
Launch:
```
python3 -m mqtt_io /etc/mqtt-io.yaml
```

Automatic start via systemd

Note

We assume that mqtt-io itself and /etc/mqtt-io.yaml are already installed.

Launch the editor:

sudo nano /etc/systemd/system/mqtt-io.service

Insert the following into it:

Warning

Example for D1/D1+ basic. For other controllers ExecStartPre must be replaced.
See Configuration files for other controllers.

[Unit]
Description=mqtt-io
After=network.target

[Service]
ExecStartPre=sh -c "echo 436 452 453 454 455 456 462 467 469 470 471 472 | xargs -n 1 echo >/sys/class/gpio/unexport; exit 0"

ExecStart=python3 -m mqtt_io /etc/mqtt-io.yaml
StandardOutput=inherit
StandardError=inherit
Restart=always
User=root

[Install]
WantedBy=multi-user.target

Starting the service:

sudo systemctl enable mqtt-io
sudo systemctl start mqtt-io

We look at the logs:
```
sudo journalctl -u mqtt-io -f
```

Configuration files

Note

Remember to change host, user, password to match your MQTT server settings.

JetHub D1/D1+ basic

mqtt-io.yaml

Unexport

echo 436 452 453 454 455 456 462 467 469 470 471 472 | xargs -n 1 echo >/sys/class/gpio/unexport

Limitations

One of the CPU cores can be as high as 40-60% (github issue).
Unable to use GPIO through sysfs at the same time.