Hello.
I would like to used 2 synchronised variables that are located on different devices.
And I have done a basic test to understand how it works. PS : I have read carefully the documentations (https://docs.arduino.cc/arduino-cloud/features/thing-to-thing/).
Here is what I have done 
- I have created 2 things ("compute 1" and "compute 2") associated to 2 devices (Etherda and Tarrah).
- I have created on each of the "device things" one variable thing that are bollean (Var_compute_1 and Var_compute_2). Both things are "Read & Write", "boolean", "Update Policy" = "On change".
- both are synchronised with the other.
- I have created a dashboard that displays both variables.
- NOTICE : I have not loaded any sketch to the devices. So the devices are NOT onLine.
Doing such, I can update the variables through the portal.
And therefore this is what I did (I have updated Var_compute_1 variable on the portal).
In my understanding, as soon as I update Var_compute_1 (moving ot from OFF to ON), I should be able to see the other variable changing also, as they are synchronised.
But it does not... Did I miss something ?
Thans for your help.
CH