Question, what is the minimum time required between two commands in single connection mode at Modbus? Or does that also depend on the connected hardware?
It depends on the Modbus device (or Modbus TCP bridge).
In normal cases you could request registers every second. But I donāt know how this is on Homey side with several Flows every 1 sec 
I can confirm, homey kill flows that trigger every 1sec after sometime.
(was trying to poll state of pir sensors to use as triggers)
Flows that check every 10sec seems okey 
(Polling Energy Meters every 10sec here)
10 seconds sounds great to let my PV inverter ride the power consumption in the house.
@RonnyW Once again many thanks for this really useful app. Iām using it for my heat pump and two inverters and itās such a great help!
As I do quite some intensive control of those devices, I would like to reduce the number of actual write operation. At least for some devices it has been reported, that too many write operation might degrade their flash memory.
The most obvious solution would be a read-compare-write-if-changed, but this would need three flow cards for every write operation, which would make many flows a bit messy (more than they already are).
So would it be possible to get a separate flow card that does the above? Just like the normal write-flow card, but it first reads the value and only actually writes it, if it needs to be changed? Or alternatively add a third mode e.g. called āupdateā to your write flow card that does that.
New test version 0.12.0:
- Added device setting to prevent register writing if unchanged.
@CaptainVoni FYI and test. Thanks for the suggestion. Even if (good) Modbus devices normally are operating in RAM and are writing only real changes to memory, it can make sense if yre not sure how the device is operating.
I decided to add this option as device setting, because you will use this logic per device and not per flow card. I hope itās working wight 
Youāre the best!!! Will start testing in the next days - today I need to test the export limitation of my inverter and I donāt want to change too much on my system while doing so.
Thank you again for this great app!
Just to report back: I have switched to the test version and changed the relevant setting. Everything seems to be working fine at first glance. Writing is significantly slower when the value changes (about factor 3-5 on the heat pump and around factor 2 on the inverters), but that is as expected. Will keep an eye on it in the next days and report back if something unexpected happens.
Once again, many thanks @RonnyW !
