Rfxtrx support for Trust Smart Home AEX-701 Repeater

Has anyone got rfxtrx working with the Trust AEX-701 repeater? I have many trust light switches and PIR sensors that worked with no difficulties. To get coverage for some new kit in the garage I got an AEX-701 repeater. It learned the switches OK and its light flashes when the switch is pressed suggesting it is working but the HA log doesn’t show the repeated signal. To test, I’ve put a switch alongside the repeater within range of the rfxcomm radio. The HA log shows an RFX event for the original switch press but no repeat. I’ve written to trust to ask if there is something different about the repeated signal vs the original. It’s always possible that the repeater is just faulty but…