add sync tcp client example

README.md

@@ -62,16 +62,29 @@ pub fn main() {
     let task = TcpClient::connect(&addr, &handle).and_then(|client| {
         client
             .read_input_registers(0x1000, 7)
-            .and_then(move |buff| {
-                println!("Response is '{:?}'", buff);
+            .and_then(move |data| {
+                println!("Response is '{:?}'", data);
                 Ok(())
             })
     });
-
     core.run(task).unwrap();
 }
 ```
 
+### Sync TCP client
+
+```rust
+extern crate tokio_modbus;
+use tokio_modbus::*;
+
+pub fn main() {
+    let addr = "192.168.0.222:502".parse().unwrap();
+    let client = SyncClient::connect_tcp(&addr).unwrap();
+    let buff = client.read_input_registers(0x1000, 7).unwrap();
+    println!("Response is '{:?}'", buff);
+}
+```
+
 ### RTU client
 
 ```rust
@@ -110,21 +123,6 @@ pub fn main() {
 }
 ```
 
-### Sync TCP client
-
-```rust
-extern crate tokio_modbus;
-
-use tokio_modbus::*;
-
-pub fn main() {
-    let addr = "192.168.0.222:502".parse().unwrap();
-    let client = SyncClient::connect_tcp(&addr).unwrap();
-    let buff = client.read_input_registers(0x1000, 7).unwrap();
-    println!("Response is '{:?}'", buff);
-}
-```
-
 More examples can be found in the [examples](https://github.com/slowtec/tokio-modbus/tree/master/examples) folder.
 
 ## Protocol-Specification

examples/tcp-client-sync.rs

@@ -0,0 +1,16 @@
+extern crate tokio_modbus;
+use tokio_modbus::*;
+
+#[cfg(all(feature = "tcp", feature = "sync"))]
+pub fn main() {
+    let addr = "192.168.0.222:502".parse().unwrap();
+    let mut client = SyncClient::connect_tcp(&addr).unwrap();
+    let buff = client.read_input_registers(0x1000, 7).unwrap();
+    println!("Response is '{:?}'", buff);
+}
+
+#[cfg(not(all(feature = "tcp", feature = "sync")))]
+pub fn main() {
+    println!("features `tcp` and `sync` are required to run this example");
+    ::std::process::exit(1);
+}

src/lib.rs

@@ -59,19 +59,32 @@
 //!     let task = Client::connect_tcp(&addr, &handle).and_then(|client| {
 //!         client
 //!             .read_input_registers(0x1000, 7)
-//!             .and_then(move |buff| {
-//!                 println!("Response is '{:?}'", buff);
+//!             .and_then(move |data| {
+//!                 println!("Response is '{:?}'", data);
 //!                 Ok(())
 //!             })
 //!     });
-//!
 //!     core.run(task).unwrap();
 //! }
 //! ```
 //!
+//! ## Sync TCP client
+//!
+//! ```rust,no_run
+//! extern crate tokio_modbus;
+//! use tokio_modbus::*;
+//!
+//! pub fn main() {
+//!     let addr = "192.168.0.222:502".parse().unwrap();
+//!     let mut client = SyncClient::connect_tcp(&addr).unwrap();
+//!     let data = client.read_input_registers(0x1000, 7).unwrap();
+//!     println!("Response is '{:?}'", data);
+//! }
+//! ```
+//!
 //! ## RTU client
 //!
-//! ```rust
+//! ```rust,no_run
 //! extern crate futures;
 //! extern crate tokio_core;
 //! extern crate tokio_modbus;
@@ -107,20 +120,6 @@
 //! }
 //! ```
 //!
-//! ## Sync TCP client
-//!
-//! ```rust
-//! extern crate tokio_modbus;
-//! use tokio_modbus::*;
-//!
-//! pub fn main() {
-//!     let addr = "192.168.0.222:502".parse().unwrap();
-//!     let client = SyncClient::connect_tcp(&addr).unwrap();
-//!     let buff = client.read_input_registers(0x1000, 7).unwrap();
-//!     println!("Response is '{:?}'", buff);
-//! }
-//! ```
-//!
 //! More examples can be found in the [examples](https://github.com/slowtec/tokio-modbus/tree/master/examples) folder.
 //!
 //! # Protocol-Specification