Just to close the loop on this, I received them on 7th August (sorry, meant to post this sooner)
Best posts made by P72endragon
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RE: Delivery from PCBWay?posted in Hardware
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RE: MySensors --> MQTT --> OpenHab 2.5posted in OpenHAB
That's great, thank you, I'll have a play and see how far I can get... (yeah, I've already been using MQTT Explorer to understand the message structure)