What should my first smart-glasses app prototype do?
Send one recognizable message to the intended glasses and accept one explicit user action if the platform supports it. This establishes the smallest complete interaction before you add live services, AI output or a complicated interface. Give the message a unique identifier so fresh output is distinguishable from cached content.
Prove the round trip
Seeing text once establishes only part of the path. The host should also receive the user's action and associate it with the message on screen. Disconnect and reconnect, then repeat with a different identifier to find out whether old state survives incorrectly.
Use a harmless example such as “Test 042: acknowledge” and record the matching response on the host. That small loop is a useful foundation because later features still depend on delivering the right content and interpreting the right action.