Wireshark 3.0.3 on MacOS 10.14.6

I am trying to capture traffic to and from a local device (a Wi-Fi power plug). 
If I connect the plug (via Wi-Fi) to a shared Internet connection on my Mac, I 
see local lan exchanges as well as packets sent from the plug to a remote 
server. The packets to the remote server are all TLS.

However, when I have the plug connected to the local network via Wi-Fi (I.e. 
not through my Mac) and I capture packets on en0 (the wired interface) I cannot 
see the packets going off lan.  It is as though the interface is not in 
promiscuous mode.

Note: on the local lan, 192.168.5.0/24, all segments, Wi-Fi and wired) are 
bridged. So, I would expect to see all traffic to/from the plug on en0.

Obviously, I am doing something wrong. But, for the life of me I can't figure 
out what.

Any/all ideas and suggestions most appreciated.

Richard
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