Your alternative device handler by jsconstantelos managed to clear an obstruction that the original handler could not. A vent using the original handler became both obstructed and unresponsive yesterday. The LED did not blink. Removing the battery to reset the vent accomplished nothing.
The jsc device handler also reported the vent as obstructed, but pressing the handler’s button on the ST app restored the blinking red light. Reset by removing the battery then restored normal operation.
The two vents previously converted to the jsc driver have been running problem-free for nine days now. I have delayed installing your v8.7.3a while evaluating the jcs driver.