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You might want to read the Wireshark Wiki page on capturing packets. As it is not as straightforward as just starting Wireshark.
Switches for instance have tables that map mac-addresses to ports so it can send traffic to only those ports that need to receive the traffic. In your case, traffic from your mobile to the Sonos system will only be sent to the Sonos system, not your Wireshark laptop, unless you take special measures.
And Wireless has it's own difficulties in getting a proper capture file.
