fix(client): validate packet length configuration

crates/irtt-client/src/lib.rs

@@ -20,7 +20,7 @@ mod timing;
 pub use client::Client;
 pub use config::{
     ClientConfig, NegotiationPolicy, RecvBudget, RunMode, SocketConfig, MAX_DSCP_CODEPOINT,
-    MAX_SERVER_FILL_BYTES, MAX_TTL,
+    MAX_SERVER_FILL_BYTES, MAX_TTL, MAX_UDP_PAYLOAD_LENGTH,
 };
 pub use error::{ClientError, EventSubscriptionError};
 pub use event::{