My internet firewall has restrictive egress filtering, especially for IoT devices that reside on their own network segment. I prefer to identify all device communication that leaves or enters my networks. This is at home.
On my iPhone, iOS 12.2, the Wyze App 2.3.69 will not show device status without TCP 8883 open from the Wyzecams. The App shows all of the Wyze devices as offline when I block TCP 8883 for the WyzeCams.
UPDATE 20190529: The Wyze iPhone App is attempting communication on: TCP 21047, UDP 10001, UDP 10240 and will not connect to the Wyzecam without those ports being open for the iPhone running the Wyze App.
This is not documented in the necessary ports section at https://support.wyzecam.com/hc/en-us/articles/360022421192-Network-Information-Compatibility