main: fix cfg warn

src/main.rs

@@ -1,6 +1,5 @@
 #![no_main]
 #![no_std]
-#![feature(str_strip)]
 #![feature(core_intrinsics)]
 
 use log::{ trace };
@@ -200,7 +199,7 @@ fn main() -> ! {
     );
 
     /*
-     *    I/O_Update -> PB15
+     *  I/O_Update -> PB15
      */
     let io_update = gpiob.pb15.into_push_pull_output();
 
@@ -220,7 +219,6 @@ fn main() -> ! {
     );
 
     urukul.reset().unwrap();
-    // info!("Test value: {}", urukul.test().unwrap());
 
     let mut mqtt_mux = MqttMux::new(urukul);
 
@@ -238,9 +236,6 @@ fn main() -> ! {
 
     let tcp_stack = NetworkStack::new(&mut net_interface, sockets);
 
-    // Case dealt: Ethernet connection break down, neither side has timeout
-    // Limitation: Timeout inequality will cause TCP socket state to desync
-    //              Probably fixed in latest smoltcp commit
     let mut client = MqttClient::<consts::U256, _>::new(
         IpAddr::V4(Ipv4Addr::new(192, 168, 1, 125)),
         "Urukul",
@@ -269,7 +264,6 @@ fn main() -> ! {
         // Process MQTT messages about Urukul/Control
         let connection = client
             .poll(|_client, topic, message, _properties| {
-                // info!("On {:?}, received: {:?}", topic, message);
                 // Why is topic a string while message is a slice?
                 mqtt_mux.process_mqtt(topic, message).unwrap();
             }).is_ok();