Retrieve sensor values from sensors on OpenHab request
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I know that OpenHab can store the last value of a sensor with persistance, but sometimes OH could go down and then sensor value change and then when it comes back it will show an outdated value.
So far a sensor does not change its value, OH will have null / old data, so how should I approach this?
I'd like it to be automatic, but I really don't know if that is a good idea, e.g. OH requesting all values from all sensors that might flood MS network.I believe one solution could be from the sensor side implementing receive to answer the req message and then...
from OH side have a rule that will (trigger when?) and request a sensor value, do I have to use the "expert mode" of the binding here?
Please advice -
just add some code in the nodes that if sensor data hasm't changed after 5 or 10 measurement, it will force the send of the value to make the controller aware that the sensor is still alive. Implementing a receive function on nodes it can be done but not for battery powered ones.
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just add some code in the nodes that if sensor data hasm't changed after 5 or 10 measurement, it will force the send of the value to make the controller aware that the sensor is still alive. Implementing a receive function on nodes it can be done but not for battery powered ones.
either what @gohan said or persist the values in OH
