Requesting time from MQTT/Openhab - How?
Im currently scratching my head trying to work out the best way to provide a sensor the current time, via MQTTClientGateway and Openhab.
I don't have access to my hardware here ( im at work ) so cant test a lot of this, but I thought id put it out here now in case anyone has some ideas/thoughts..or solution
Q: What message is sent to MQTT when a sensor node requests the time?
Q: What does the Openhab "item" look like to watch for the request. This would then run a rule to return the epoch time back to the sensor node.
Q: What MQTT message needs to be returned to the node?
To answer myself, the mqtt message sent is onto topic
(where x is the node id )
and the reply is likewise sent back to
mygateway1-in/4/255/3/0/1 - with a payload being the epoch time
So now to work out the plumbing within Openhab. I already have a Number item with the epoch time (albeit in UTC)...so just need to work on the rules.
My memory is sh*t.... i even replied to this relevant post!