modify example and readme

Author: lsongdev

README.md

@@ -71,13 +71,28 @@ find serial port channel
 ```js
 device.findSerialPortChannel(address, function(channel){
   console.log('Found RFCOMM channel for serial port on %s: ', name, channel);
-  
+
   // make bluetooth connect to remote device
   bluetooth.connect(address, channel, function(err, connection){
     if(err) return console.error(err);
     connection.write(new Buffer('Hello!', 'utf-8'));
   });
-  
+
+});
+```
+
+create connection to device, read and write
+
+```js
+// make bluetooth connect to remote device
+bluetooth.connect(address, channel, function(err, connection){
+  if(err) return console.error(err);
+
+  connection.on('data', (buffer) => {
+    console.log('received message:', buffer.toString());
+  });
+
+  connection.write(new Buffer('Hello!', 'utf-8'));
 });
 ```
 

example/index.js

@@ -8,19 +8,24 @@ var list = [];
 device
 .on('finished',  console.log.bind(console, 'finished'))
 .on('found', function found(address, name){
-  
+
   console.log('Found: ' + address + ' with name ' + name);
-  
+
   // find serial port channel
   device.findSerialPortChannel(address, function(channel){
     console.log('Found RFCOMM channel for serial port on %s: ', name, channel);
-    
+
     // make bluetooth connect to remote device
     bluetooth.connect(address, channel, function(err, connection){
       if(err) return console.error(err);
+
+      connection.on('data', (buffer) => {
+        console.log('received message:', buffer.toString());
+      });
+
       connection.write(new Buffer('Hello!', 'utf-8'));
     });
-    
+
   });
-  
+
 }).inquire();