Multiple pop messages, only one is shown

[dlktdr]

If two pop-up messages arrive, only the last is shown

Example, Firmware out of date and not-calibrated messages arrive. Only the latter Not-Calibrated is persistent.

QMessagebox could not be used because it's blocking. So it should be changed to (IMHO),

Pop up in top right with message and a close X. If it's a warning should automatically disappear after a timeout. Messages stack up under each other.