Merge pull request #10 from thorikawa/delimiter

Add delimiter property for incoming data.

example/index.js

@@ -19,6 +19,7 @@ device
     bluetooth.connect(address, channel, function(err, connection){
       if(err) return console.error(err);
 
+      connection.delimiter = Buffer.from('\n', 'utf8');
       connection.on('data', (buffer) => {
         console.log('received message:', buffer.toString());
       });

index.js

@@ -18,12 +18,23 @@ function Connection(port, address){
   const self = this;
   this.port    = port;
   this.address = address;
+  this.buffer = new Buffer(0);
   const read = function () {
     process.nextTick(function() {
       if (self.isOpen()) {
-        self.port.read(function(err, data){
+        self.port.read(function(err, chunk){
           if(err) return self.emit('error', err);
-          self.emit('data', data);
+          if (self.delimiter) {
+            let data = Buffer.concat([self.buffer, chunk]);
+            let position;
+            while ((position = data.indexOf(self.delimiter)) !== -1) {
+              self.emit('data', data.slice(0, position));
+              data = data.slice(position + self.delimiter.length);
+            }
+            self.buffer = data;
+          } else {
+            self.emit('data', chunk);
+          }
           read();
         });
       }