homie-power-supply-node

homie-power-supply-node is a Python package that uses homie-spec to provide a homie node implementation that can be used to create Homie-compliant messages from your power supply device.

This package has no dependencies other than Python >=3.6 and homie-spec. Only Linux is supported at the moment, as it uses /sys/class/power_supply/*/uevent to read the power supply properties.

Installation

Use the package manager pip to install homie-power-supply-node.

pip install homie-power-supply-node

Usage

from homie_spec import Device
from homie_power_supply_node import PowerSupply

desktop = Device(
    id="desktop",
    name="Desktop Computer",
    nodes={"battery": PowerSupply("BAT0").node(whitelist_properties=["capacity"])},
)

messages = desktop.messages()
assert next(messages).topic == "homie/desktop/$state"
assert next(messages).topic == "homie/desktop/$name"
assert next(messages).topic == "homie/desktop/$homie"
assert next(messages).topic == "homie/desktop/$implementation"
assert next(messages).topic == "homie/desktop/$nodes"

msg = next(messages)
assert msg.topic == "homie/desktop/battery/$name"
assert msg.payload == "BAT0"

msg = next(messages)
assert msg.topic == "homie/desktop/battery/$type"
assert msg.payload == "power-supply"

msg = next(messages)
assert msg.topic == "homie/desktop/battery/$properties"
assert msg.payload == "capacity"

msg = next(messages)
assert msg.topic == "homie/desktop/battery/capacity/$name"
assert msg.payload == "Capacity"

msg = next(messages)
assert msg.topic == "homie/desktop/battery/capacity/$datatype"
assert msg.payload == "integer"

msg = next(messages)
assert msg.topic == "homie/desktop/battery/capacity/$unit"
assert msg.payload == "%"

msg = next(messages)
assert msg.topic == "homie/desktop/battery/capacity/$format"
assert msg.payload == "0:100"


print(
    "Current battery capacity: "
    f"{format(desktop.getter_message('battery/capacity').payload)}%"
)
"""

Contributing

Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.

Please make sure to update tests as appropriate.

License

MIT