Not seeing UDP packets of smart home device

edit

Hey,

I'm trying to understand the communication behaviour of my Xiaomi Roborock S502. Specificly I am looking for the packets sent directly from my smartphone to the robot. I connected my laptop to my routers wifi. With wireshark in promisious mode I could see the cloud communication of the robot. But whenever I issued a command on my phone in the Xiaomi app, that would get send directly to the robot, no packet showed up in wireshark. I expect the packets to be UDP and arrive on port 54321 on the robot. This has been observed by other people. What am I doing wrong?

I am using a Win10 laptop with a fresh installation of wireshark.