From dc11634aca9cc3d5d060263d01e0a4dcaf495070 Mon Sep 17 00:00:00 2001
From: Simon Johnston <johnstonskj@gmail.com>
Date: Tue, 18 Aug 2020 12:35:53 -0700
Subject: [PATCH] const-ed the "usb" string

---
 src/bin/main.rs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/bin/main.rs b/src/bin/main.rs
index b7b486b..ab3b0e2 100644
--- a/src/bin/main.rs
+++ b/src/bin/main.rs
@@ -45,6 +45,8 @@ pub(crate) enum SubCommand {
     Off,
 }
 
+const DEVICE_CONNECTION_USB: &str = "usb";
+
 fn main() -> Result<(), Box<dyn Error>> {
     let args = CommandLine::from_args();
 
@@ -59,7 +61,7 @@ fn main() -> Result<(), Box<dyn Error>> {
         })
         .init();
 
-    if args.device == "usb" {
+    if args.device == DEVICE_CONNECTION_USB {
         let discovery = USBDeviceDiscovery::new()?;
         let device = discovery.device()?;
         debug!("USB device: '{}'", device.id());