usbportinfo: document interface variation

Document that the interface number can vary depending on the platform. This addresses some surprise discovered in #214, as it isn't entirely clear which interface should be used, but it is definitely clear that different platforms report differing interface indexes. Signed-off-by: Sean Cross <[email protected]>
serialport · Sep 28, 2024 · f014e39 · f014e39
1 parent f1b8ecf
commit f014e39
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/src/lib.rs b/src/lib.rs
@@ -787,7 +787,9 @@ pub struct UsbPortInfo {
     pub manufacturer: Option<String>,
     /// Product name (arbitrary string)
     pub product: Option<String>,
-    /// Interface (id number for multiplexed devices)
+    /// The interface index of the USB port. This can be either the interface number of
+    /// the communication interface (as is the case on Windows and Linux) or the data
+    /// interface (as is the case on macOS), so you should recognize both interface numbers.
     #[cfg(feature = "usbportinfo-interface")]
     pub interface: Option<u8>,
 }