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why cant I see both sides of a SSDP M-SEARCH interaction?

I'm trying to understand the interaction between an SSDP M-Search initiator (Amazon Echo) and an ESP8266 based device emulating a Wemo switch.

I can see the the initiation message from the Echo in the WireShark packet log but not the response from the device although I am certain it is sent because the Echo acts on the response.

I know the IP and mac addr of both the devices.

why cant I see both sides of a SSDP M-SEARCH interaction?

I'm trying to understand the interaction between an SSDP M-Search initiator (Amazon Echo) and an ESP8266 based device emulating a Wemo switch.

I can see the the initiation message from the Echo in the WireShark packet log but not the response from the device although I am certain it is sent because the Echo acts on the response.

I know the IP and mac addr of both the devices.

I should say that this is the first time I've used WireShark.

What am I doing wrong?