Beginner - Display Filter and Ping

Wireshark 3.2.3, iMac 2017, MacOS 10.12.4

I'm trying to figure out why the "LAN Control" on a Yeelight "smart lightbulb" stopped working. You can control the bulb by sending UDP messages at port 55443. This was working fine for me for a while and then stopped. A friend suggested using Wireshark to check network traffic. I've found it to be a steep learning curve.

When I use a filter with the IP address of the device (ip==192.168.0.200), Wireshark detects no traffic at all even when I send a formerly working message via UDP. OK, something wrong.

But even when I ping the device Wireshark shows nothing at that IP address:

    MrMuscle:~ mnewman$ ping -c 3 192.168.0.200
    PING 192.168.0.200 (192.168.0.200): 56 data bytes
    64 bytes from 192.168.0.200: icmp_seq=0 ttl=255 time=133.614 ms
    64 bytes from 192.168.0.200: icmp_seq=1 ttl=255 time=3.227 ms
    64 bytes from 192.168.0.200: icmp_seq=2 ttl=255 time=4.719 ms

    --- 192.168.0.200 ping statistics ---
    3 packets transmitted, 3 packets received, 0.0% packet loss
    round-trip min/avg/max/stddev = 3.227/47.187/133.614/61.116 ms

What am I doing wrong?