I see.

Thanks for all your help so far but, as I have no idea where to start to make that all work, I will have to investigate other means.

As the data that I want to send is just the mac address repeated 16 times, could I somehow trick a web page (hosted on the empeg with hijack's httpd) to send this to a broadcast address as a page request?

Does anyone have any other ideas?
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MK2 smoked 32Gb S/n 090000949 MK2a Blue 20GB racked and out of sync