note; I have all my scripts setup so that the lwt (last will and testament) publishes 'offline' if the scripts die.
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August 29, 2015 13:57
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Last Will and Testament Notification Function for mqttwarn. https://github.com/jpmens/mqttwarn
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| ################################################################ | |
| ##### Last Will and Testament Notification Function ##### | |
| ################################################################ | |
| #lwt offline message to check for | |
| lwtmsg_offline = 'offline' | |
| #last will and Testaments topics to not suppress | |
| lwttopics2mon = [ | |
| '/lwt/testing1', #testing topic | |
| ] | |
| #filter to check to see if the device/software is offline | |
| def lwtfilter(topic, message): | |
| for t in lwttopics2mon: | |
| if t in topic: | |
| if message == lwtmsg_offline: | |
| return False #dont suppress the notifcations | |
| return True #suppress the notification |
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| [lwt] | |
| topic = /lwt/# | |
| targets = log:info,pushover:software | |
| filter = lwtfilter() | |
| format = Device: {topic} went ==> {payload} @{_dthhmm} | |
| title = MQTT LWT Notification |
Just added a change to allow you to specify the lwt payload in mqttwarn.
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@summerboy12, thx, was one commit behind... forgot to chk that. Have updated the script above to reflect that now
JP's explains lwt the best, here in an old post...
http://jpmens.net/2013/02/25/lots-of-messages-mqtt-pub-sub-and-the-mosquitto-broker/
"Clients can optionally set a Will (in Python before the connect() call). This "last will and testament" (so to speak) is published by the broker when a client disconnects unexpectedly. This can be useful to notify of particular clients' deaths. In other words, if a client issues the following request before connecting, and it dies at some later point, the broker will publish the payload on this client's behalf."
I have most of my scripts setup, so that when they start it publishes to the /lwt/%scriptname$ topic saying tat the script is online and if it dies it publishes offline usng the lwt... that is where the lwt script i made comes in handy.
Dont believe there is a standard as to what the lwt message should be, have seen lots of different versions, 0's and 1's etc, I just use online/offline for my use.