diff --git a/README.md b/README.md
index f85c756..c14cc0c 100644
--- a/README.md
+++ b/README.md
@@ -8,3 +8,21 @@
 * RABBITMQ_USER
 * RABBITMQ_PASSWORD
 * RABBITMQ_USE_SSL
+
+## docker-compose sample
+```
+version: "2"
+
+services:
+ barcode-scanner:
+   image: mxfox.ru/mxfox/barcode-scanner-client:latest
+   devices:
+    - "/dev/ttyACM0:/dev/ttyACM0"
+   environment:
+    - 'SCANNER_PORT=/dev/ttyACM0' 
+    - 'RABBITMQ_HOST=rabbitmq' 
+    - 'RABBITMQ_USER=user' 
+    - 'RABBITMQ_PASSWORD=pass' 
+    - 'RABBITMQ_USE_SSL=false' 
+    - 'RABBITMQ_VIRTUAL_HOST=/'
+```
\ No newline at end of file
diff --git a/barcodeScanner.php b/barcodeScanner.php
index af8b168..43330f3 100644
--- a/barcodeScanner.php
+++ b/barcodeScanner.php
@@ -15,9 +15,8 @@ $rabbitLogin=getenv("RABBITMQ_USER");
 $rabbitPass=getenv("RABBITMQ_PASSWORD");
 $rabbitUseSSL=getenv("RABBITMQ_USE_SSL")==="true";
 $rabbitVirtualHost=getenv("RABBITMQ_VIRTUAL_HOST")?getenv("RABBITMQ_VIRTUAL_HOST"):"/";
+$routingTag=getenv("DEFAULT_TAG")?getenv("DEFAULT_TAG"):null;
 
-
-$routingTag=null;
 $connection=null;
 $channel=null;
 
@@ -54,6 +53,14 @@ function rabbitConnect($rabbitHost, $rabbitPort, $rabbitLogin, $rabbitPass, $rab
     return $connection;
 }
 
+function register($channel, $routingTag) {
+    print "Register\n";
+    if (!empty($routingTag)) {
+        $msg = new AMQPMessage(json_encode(["type"=>"service","data"=>"register"]));
+        $channel->basic_publish($msg, 'fox.barcode', $routingTag);
+    }
+}
+
 function scanner($channel, $port) {
     global $routingTag;
 
@@ -68,6 +75,7 @@ function scanner($channel, $port) {
         }
 
     }
+    
     while (1) {
         $buffer = fgets($fp, 4096);
         $rv=explode("\n", $buffer);