Made it a library, as I should have done from the beginning

examples/demo3270.rs

@@ -1,8 +1,7 @@
 use structopt::StructOpt;
 use std::time::Duration;
 
-mod tn3270;
+use tn3270s::tn3270;
-mod encoding;
 
 #[derive(StructOpt)]
 pub struct Cli {
@@ -43,7 +42,9 @@ fn main() -> anyhow::Result<()> {
                 }
             };
 
-            run(session);
+            if let Err(err) = run(session) {
+                eprintln!("Error in session: {}", err);
+            }
 
         });
     }

src/lib.rs

@@ -0,0 +1,2 @@
+pub mod tn3270;
+mod encoding;

src/tn3270.rs

@@ -7,7 +7,6 @@ use libtelnet_rs::{
     }
 };
 use std::net::TcpStream;
-use libtelnet_rs::telnet::op_option::EOR;
 use std::io::{Write, Read};
 use std::time::Duration;
 
@@ -124,14 +123,14 @@ impl Session {
         initial_negotiation.extend(self.parser._do(tn_opt::TTYPE));
         initial_negotiation.extend(self.parser._will(tn_opt::TTYPE));
 
-        self.process_events(initial_negotiation);
+        self.process_events(initial_negotiation)?;
 
         // Large enough for a TCP packet
         let mut idata = Vec::with_capacity(2000);
         idata.resize(idata.capacity(), 0);
 
         // Make sure that negotiation completes quickly
-        self.stream.set_read_timeout(Some(Duration::from_secs(5)));
+        self.stream.set_read_timeout(Some(Duration::from_secs(5)))?;
 
         while !self.is_ready() {
             let len = self.stream.read(&mut idata[..])?;
@@ -143,6 +142,7 @@ impl Session {
             self.process_events(events)?;
         }
 
+        self.stream.set_read_timeout(None)?;
         Ok(true)
 
     }

src/tn3270/stream.rs

@@ -160,7 +160,7 @@ bitflags! {
 }
 
 #[derive(Copy, Clone, Debug, Hash)]
-enum Transparency {
+pub enum Transparency {
     Default,
     Or,
     Xor,