Low Battery Alert (Example Rule Not Working)

Setup, Configuration and Use Scripts & Rules
15

Since we are all sharing :wink:

I don’t actually have a battery alert rule any more. I just have a Group and I periodically look at my sitemap to see what the minimum charge is. My smoke alarms start to beep at around 40% anyway and the door deadbolts have a flashing status light we see every day.

But I do have a Rule to monitor the online/offline status of various servers and services that are relevant to my home automation. And every morning at 8 I generate a report with a list of all those that are offline.

from core.rules import rule
from core.triggers import when
from core.metadata import set_metadata
from personal.util import send_info, get_name

@rule("System status reminder",
      description=("Send a message with a list of offline sensors at 08:00 and "
                   "System start"),
      tags=["admin"])
@when("Time cron 0 0 8 * * ?")
@when("System started")
def status_reminder(event):
    """
    Called at system start and at 8 AM and generates a report of the known
    offline sensors
    """

    numNull = len([i for i in ir.getItem("gSensorStatus").members
                   if isinstance(i.state, UnDefType)])
    if numNull > 0:
        status_reminder.log.warning("There are {} sensors in an unknown state!"
                                    .format(numNull))

    offline = [i for i in ir.getItem("gSensorStatus").members if i.state == OFF]
    offline.sort()
    if len(offline) == 0:
        status_reminder.log.info("All sensors are online")
        return

    offline_str = ", ".join(["{}".format(get_name(s.name)) for s in offline ])
    offline_message = ("The following sensors are known to be offline: {}"
                       .format(offline_str))

    for sensor in offline:
        set_metadata(sensor.name, "Alert", { "alerted" : "ON"}, overwrite=False)
    send_info(offline_message, status_reminder.log)

send_info and get_name are personal library functions.

from core.actions import NotificationAction
from core.jsr223.scope import actions
from configuration import admin_email, alert_email
from core.metadata import get_value

def send_info(message, logger):
    """
    Sends an info level message by sending an email and logging the message
    at the info level.

    Arguments:
        - message: The String to deliver and log out at the info level.
        - logger: The logger used to log out the info level alert.
    """
    out = str(message)
    logger.info("[INFO ALERT] {}".format(message))
    NotificationAction.sendNotification(admin_email, out)
    (actions.get("mail", "mail:smtp:gmail")
        .sendMail(admin_email,  "openHAB Info", out))

def get_name(itemName):
    """
    Returns the 'name' metadata value or the itemName if there isn't one.

    Arguments:
        itemName: The name of the Item
    Returns:
        None if the item doesn't exist.
    """
    return get_value(itemName, "name") or itemName

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