rule "Xiaomi Battery Notification"
when
Item BAGNO_MG_LOWBATT changed from OFF to ON or
Item SALA_MG_LOWBATT changed from OFF to ON or
Item SALOTTO_DX_MG_LOWBATT changed from OFF to ON or
Item SALOTTO_SX_MG_LOWBATT changed from OFF to ON
then
//Checke wich Item fired this rule
//Do something Else
end
This rule is fired every time a sensor send Low Battery. Is there a way in the rule to check wich Item fired the rule and have its name into a string? So I can send a specific notification for each sensor without write one rule for each sensor.
You can try assigning these items to a group, then use this as a guideline!
For the item name, in the rule, after you get the item that triggered the group update, you can use
myItem.name.toString
Be aware that you might have to use persistence for this!
Hey, great! It would be amazing if you could post your findings for others. The next one looking for an answer on how to “Identify which item fired a rule” will be thankful to you.
I might suggest that there could be a different approach that would require a slightly more complex rule but would not require the persistence hack to get the triggering Item. Rather than sending a separate alert for each battery why not consolidate the alerts. If anyone of them goes off send an alert with all the batteries that are off.
Put your Items into a Group. Then:
val lastAlert = ""
rule "Xiaomi Battery Notification"
when
Item XiaomiBatteries received update
then
// If all the Switches are OFF we have nothing to do
if(XiaomiBatteries.state == OFF) return false;
val StringBuilder alert = new StringBuilder
// Build an alert message listing all the Items that are ON
alert.append("The following devices have a low battery: ")
XiaomiBatteries.members.filter[bat | bat.state == ON].forEach[ bat |
// use a MAP transform to convert the Item name into a nice name for messages
alert.append(transform("MAP", "xiaomi.map", bat.name) + ", ")
]
alert.setLength(sb.length() - 2) // strip off the trailing ", "
alert.append(".")
// Only send this alert if it is different from the last alert sent
if(alert.toString != lastAlert){
lastAlert = alert.toString
// send the alert
}
end
Where ever possible, I try to avoid using the persistence hack to identify which Item triggered a rule because while it works fairly well, it is brittle and dependent on timing differences.
Hi @rlkoshak
as usual thanks for your precious help.
I started from your example, but I prefer to use “changed from OFF to ON”, this because my item receive an update every couple of minutes, using “changed from OFF to ON” rule is fired only when a sensor send alarm.
I have an issue with this line of your code:
alert.setLength(sb.length() - 2) // strip off the trailing ", "
rule execution stop at this line, tell me that sb is not valid
Everyone gets caught by stupid copy and paste errors every now and again. It looks like you figured it out but for everyone else, it should be alert.setLength(alert.length() - 1).
Did you define it as a Group:Switch? If you do not provide a type to the Group it will never be updated and therefore never trigger the rule.
