power-off adapter for ioBroker

Allows to power off your linux box.

This adapter was created to shutdown a slave-host on low battery level of its UPS (Uninterruptible Power Supply).

For restarting the adapter either executes "sudo poweroff" or "sudo reboot". Your user under which iobroker is running (by default "iobroker") needs to have sudo rights to those two commands.

edit the sudo rules with

sudo visudo

Adding this line will allow the user iobroker reboot and poweroff

iobroker ALL=(ALL) NOPASSWD: /sbin/poweroff, /sbin/reboot

Example Usage

Setting one of these switched to true shuts the host down or reboots.

Example UPS monitoring via node-red. Sending notifications when battery gets low and shutting host when getting below a minimal threshold:

Example script used in node-red monitoring:

const emailPercThreshold = 70;
const shutDownPercThreshold = 20;
const msBetweenMails = 1000*60*30;
const now = new Date().getTime();

msg.bus_voltage = parseFloat(msg.payload);
msg.batteryPerc = Math.min(100,Math.max((msg.bus_voltage - 3)/1.2*100));

if (msg.batteryPerc < shutDownPercThreshold) {
    msg.topic = `iobrokerwheather shutting down, UPS only ${Math.round(msg.batteryPerc)}% battery remaining`;
    msg.payload = true;
    return [null, msg, msg];
}
else if (msg.batteryPerc < emailPercThreshold) {
    const lastMsgTime = flow.get("iobrokerwheatherLastMsg");
    if (lastMsgTime !== undefined && now - lastMsgTime < msBetweenMails) {
        return;
    }
    
    msg.topic = `iobrokerwheather, UPS only ${Math.round(msg.batteryPerc)}% battery remaining`;
    flow.set("iobrokerwheatherLastMsg", now);
    return [msg, null, msg];
}

return [null, null, msg];

Changelog

1.0.6 (2022-01-23)

• first working release

License

MIT License

Copyright (c) 2022 Daniel Keller [email protected]

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.