diff --git a/src/lib.rs b/src/lib.rs
index a58bdb7..2e174ca 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -12,6 +12,7 @@ use embassy_rp::peripherals::USB;
 use embassy_rp::usb::{Driver, InterruptHandler};
 
 use embassy_usb::class::cdc_acm::{CdcAcmClass, State};
+pub use embassy_usb::driver::EndpointError;
 use embassy_usb::{Builder, Config, UsbDevice};
 
 pub use serial_config::SerialConfig;
@@ -93,11 +94,11 @@ impl Serial<'static> {
         }
     }
 
-    pub async fn send_msg(&mut self, s: &str) {
-        self.class.write_packet(s.as_bytes()).await.unwrap_or(());
+    pub async fn send_msg(&mut self, s: &str) -> Result<(), EndpointError> {
+        self.class.write_packet(s.as_bytes()).await
     }
 
-    pub async fn send_number<T, I>(&mut self, i: T, base: I)
+    pub async fn send_number<T, I>(&mut self, i: T, base: I) -> Result<(), EndpointError>
     where
         T: NumToA<I>,
     {
@@ -105,6 +106,6 @@ impl Serial<'static> {
 
         let s = i.numtoa_str(base, &mut buf);
 
-        self.send_msg(s).await;
+        self.send_msg(s).await
     }
 }