Call connect() from a user gesture such as a click. Browser permission prompts are commonly blocked outside a user action.
Close other serial applications, reconnect the cable, and forget then re-grant the browser’s device permission if necessary.
Ensure autoRefresh is enabled or call refresh() manually. Refresh pauses during file transfers by default.
Call dispose() when abandoning a device instance. disconnect() closes the port but does not clear the refresh timer.
Confirm the connection is still active. High-level methods commonly return undefined when there is no usable connection or reply.